the decay constant for this material is approximately 0.0445.when t = 8 years, the amount of the material remaining is 550 grams.
The formula for radioactive decay is given by:
a = [tex]e^(-kt)\\[/tex] * A
where a is the final amount,A is the initial amount, t is the time in years, and k is the decay constant.
We can use the given information to solve for k as follows:
When t = 0, a = A. So, we have:
A = [tex]e^(0 * k)[/tex] * A
Simplifying this gives:
1 = e^0
Therefore, we can see that k = 0 at the start of the decay process.
Now, when t = 8 years, the amount of the material remaining is 550 grams. Therefore, we have:
550 = [tex]e^(-8k)[/tex] * 700
Dividing both sides by 700 and taking the natural logarithm of both sides, we get:
ln(550/700) = -8k
Simplifying this gives:
k = ln(700/550)/8
Using a calculator, we can evaluate this expression to get:
k ≈ 0.0445
Therefore, the decay constant for this material is approximately 0.0445.
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as a television executive, you have been given 24 shows to choose from to run during your prime time slots each week. if you have to choose 16 shows to run on your network, how many ways can you choose which shows to pick up?
As per the combination concept, there are 735,471 ways to choose 16 shows from a set of 24.
To find the number of ways to choose 16 shows from a set of 24, we can use the formula for combinations, which is:
ⁿCₓ = n! / x!(n-x)!
Where n is the total number of objects in the set (in this case, 24), and x is the number of objects we want to choose (in this case, 16). The exclamation mark (!) denotes the factorial function, which means multiplying the number by all positive integers less than itself.
Plugging in the numbers, we get:
²⁴C₁₆ = 24! / 16!(24-16)! = 735471
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What are the values of x and y? *
Pls help!
Answer:
x = 8
y = 12
Step-by-step explanation:
m∠A = sin⁻¹(9/15) = 36.87⁰
cos36.87 = y/15
y = 15(cos36.87) = 12
sin36.87 = 12/(12+x)
12 + x = 12/(sin36.87)
x = 12/(sin36.87) - 12 = 8
4. Which of the following is the square of a binomial?
A. r² - 2rs +s²
B. c² + d²
C. 16x² - 25y²
D. d² - de + e²
The correct answer is (A) r² - 2rs +s² which is a square of a Binomial.
What exactly are binomials?
In algebra, a binomial is a polynomial which consists of two terms. The terms may be separated by a plus or minus sign. The general form of a binomial is:
ax + b
where "a" and "b" are constants and "x" is the variable. A binomial can be added, subtracted, multiplied, and divided using algebraic operations. Binomials are commonly used in algebra to represent and solve problems involving two quantities or variables.
Now,
The correct answer is (A) r² - 2rs +s².
This is a perfect square trinomial, which can be written as (r - s)².
Option (B) c² + d² is not a binomial, it is the sum of two squares.
Option (C) 16x² - 25y² is a difference of two squares, which can be written as (4x + 5y)(4x - 5y).
Option (D) d² - de + e² is also a perfect square trinomial, but it cannot be written as the square of a binomial.
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Bennie is calculating the density of books in a box. He knows the number of books in the box and the volume of the box. Which of the following formulas can be used to calculate the density of books in the box? Density = number of books over volume of box Density = volume of box over number of books Volume of shelf = density over number of books Number of books = density over volume of box
Answer:
Density = number of books over volume of box
Step-by-step explanation:
The formula that can be used to calculate the density of books in the box is:
Density = number of books / volume of box
This formula relates the number of books in the box to the volume of the box, and calculates the density of books per unit volume.Therefore, the correct formula to calculate the density of books in the box is the first one given in the options:
Density = number of books over volume of box
Answer:
Density = number of books over volume of box
Step-by-step explanation:
what maximum number of cumulative pass not advanced (pna) points can be applied to a candidates final multiple score
A candidate's final multiple score main answer can have a maximum of three cumulative Pass Not Advanced (PNA) points applied to it.
PNA points are a form of assessment for a candidate's answers to multiple-choice questions.
They are awarded when the candidate selects an answer that is not necessarily wrong, but does not go into sufficient depth or demonstrate the required level of understanding.
Each PNA point is worth a fraction of a mark, with a total of three PNA points making up one mark of the candidate's final multiple score main answer.
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suppose you have 4 pairs of socks and 4 pairs of shoes. if you can wear any combination of socks and shoes, including mismatched pairs, how many different possible footwear choices can you make
There are a total of 32 different possible footwear choices that we can make.
Given, The number of pairs of socks = 4
The number of pairs of shoes = 4
We are to find out the number of possible footwear choices we can make if we can wear any combination of socks and shoes, including mismatched pairs.
So, We can wear any pair of socks with any pair of shoes including a mismatch.
Thus, for each pair of socks, there are 4 possible pairs of shoes.
And for each pair of shoes, there are 4 possible pairs of socks.
Therefore, we can form,
Total number of possible footwear choices = 4 pairs of socks * 4 pairs of shoes * 2 (considering the case of mismatched pairs) = 32 pairs.
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from an unlimited selection of five types of soda, one of which is dr. pepper, you are putting 25 cans on a table. determine the number of ways you can select 25 cans of soda if you must include at least seven dr. peppers..
There are 5²⁵ possible ways to select 25 cans of soda from 5 types, while there are [5¹⁸] (25 choose 7) possible ways to select 25 cans with at least 7 Dr. Peppers, and only [3²²] (25 choose 3) possible ways to select 25 cans with only 3 Dr. Peppers available.
(a) Since there are five types of soda and we are selecting 25 cans, we can choose any type of soda for each can. Therefore, the number of ways to select 25 cans of soda is 5²⁵.
(b) If we must include at least seven Dr. Peppers, then we can choose the remaining 18 cans from any of the five types of soda (including Dr. Pepper). We can choose 7 Dr. Peppers in (25 choose 7) ways. Therefore, the number of ways to select 25 cans of soda with at least seven Dr. Peppers is (25 choose 7) [5¹⁸].
(c) If there are only three Dr. Peppers available, then we must choose all three Dr. Peppers and select the remaining 22 cans from the four types of soda (excluding Dr. Pepper). We can choose the remaining 22 cans in 4²² ways. Therefore, the number of ways to select 25 cans of soda with only three Dr. Peppers available is 3 [4²²].
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Complete question:
From an unlimited selection of five types of soda, one of which is Dr. Pepper, you are putting 25 cans on a table.
(a) Determine the number of ways you can select 25 cans of soda.
(b) Determine the number of ways you can select 25 cans of soda if you must include at least seven Dr. Peppers.
(c) Determine the number of ways you can select 25 cans of soda if it turns out there are only three Dr. Peppers available.
If triangle ABC is a 30-60-90 degree triangle and we know the following
point A is (-4,-2)
point B is (4,-2)
then we must find point C. If the angle of C is 90 degrees and point C is in quadrant 1 then where is point C?
The coordinates of point C are (4, 2), which is located in quadrant 1.
In a 30-60-90 degree triangle, the side opposite the 30-degree angle is half the length of the hypotenuse, and the side opposite the 60-degree angle is √3/2 times the length of the hypotenuse. Since the side opposite the 30-degree angle is the shortest side, it must be the distance between points A and B, which is 8 units.
Let's call point C (x, y). Since angle C is 90 degrees, side AC is perpendicular to side AB, which means it is a vertical line that passes through point A. Similarly, side BC is perpendicular to side AB, which means it is a horizontal line that passes through point B.
Therefore, point C must lie on both the vertical line passing through A and the horizontal line passing through B. The equation of the vertical line passing through A is x = -4, and the equation of the horizontal line passing through B is y = -2. So we have the system of equations
x = -4
y = -2
Solving this system gives us the coordinates of point C: (-4, -2). However, this point is not in quadrant 1, as we desired.
To find a point C in quadrant 1, we need to flip the signs of the x and y coordinates of point C. So the coordinates of point C are (4, 2).
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i need help on all of this
Answer: 1 1/12
Step-by-step explanation:
so you would subtract 2-1=1
Then you do 1/3-1/4=1/12
The answer would be 1 1/12
UR WELCOME
5 cards are drawn randomly from a regular deck of cards. how many ways can you draw 5 cards and get 4 hearts and 1 spade?
Answer:
There are 13 hearts in a deck of cards, so the probability of drawing a heart on the first draw is 13/52. After the first heart is drawn, there are 12 hearts left in the deck out of a total of 51 cards, so the probability of drawing another heart is 12/51. This process continues until we have drawn 4 hearts and 1 spade. Therefore, the total number of ways to draw 5 cards with 4 hearts and 1 spade is:
(13/52) x (12/51) x (11/50) x (10/49) x (13/48) x 5!
The factor of 5! accounts for the fact that the 5 cards can be drawn in any order. Simplifying the expression above, we get:
(13/52) x (12/51) x (11/50) x (10/49) x (13/48) x 120 = 0.000495 or approximately 1 in 2,020 ways.
Therefore, there are approximately 2020 ways to draw 5 cards from a regular deck of cards and get 4 hearts and 1 spade.
There are 54,145,200 ways to draw 5 cards and get 4 hearts and 1 spade from a regular deck of cards.
There are 13 hearts in a deck of cards, so the probability of drawing a heart on the first draw is 13/52 or 1/4. The probability of drawing another heart on the second draw, given that one heart has already been drawn, is 12/51. The same goes for the third and fourth draws. The probability of drawing a spade on the fifth draw is 13/50.
To calculate the number of ways to draw 4 hearts and 1 spade, we need to multiply the number of ways to choose 4 hearts from 13 (13 choose 4 or 715) by the number of ways to choose 1 spade from 13 (13 choose 1 or 13) and then multiply that by the number of ways to arrange those 5 cards (5!). So, the total number of ways is:
715 * 13 * 5! = 54,145,200
Therefore, there are 54,145,200 ways to draw 5 cards and get 4 hearts and 1 spade from a regular deck of cards.
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F(x)=1/x squared -3x +1 then iind the inverse
The inverse function for the given function F(x)=1/x² -3x +1 is given by
f⁻¹(x) =(3 ± √(9 + 4/(x - 1))) /2.
Function f(x) is equals to,
F(x)=1/x² -3x +1
Inverse of a function, we need to swap the positions of the x and y variables and then solve for y.
Let's start with the original function
f(x) = 1/x^2 - 3x + 1
Now we will swap x and y,
⇒ x = 1/y^2 - 3y + 1
Next, Solve for y in terms of x
⇒ x = 1/y^2 - 3y + 1
⇒ x - 1 = 1/y^2 - 3y
⇒ 1/(x - 1) = y^2 - 3y
⇒ 1/(x - 1) = y(y - 3)
⇒ y(y - 3) = 1/(x - 1)
⇒ y^2 - 3y - 1/(x - 1) = 0
Using the quadratic formula, solve for y to get inverse function we have,
y = (3 ± √(9 + 4/(x - 1))) / 2
Therefore, the inverse function of f(x) is equal to f⁻¹(x) =(3 ± √(9 + 4/(x - 1))) /2.
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The above question is incomplete, the complete question is:
F(x)=1/x squared -3x +1 then Find the inverse
Find the volume of a right circular cone that has a height of 20 ft and a base with a radius of 18 ft. Round your answer to the nearest tenth of a cubic foot
Answer:
The answer should be 20,365.714 but I am not sure
Step-by-step explanation:
Layla makes necklaces to sell online. she spends $46 on supplies at the first store and then $30 at the second store. she press to make a necklaces and sell each necklace at a markup of 75%. how much will she charge for each necklace?
a)12.55
b)1663
c)28.45
d)133.04
Answer:
Step-by-step explanation:
First, we need to determine the cost of making one necklace.
The total cost of supplies is $46 + $30 = $76.
If she makes one necklace, that cost is divided by one, so the cost of making one necklace is $76.
To find the selling price, we need to add a markup of 75%.
Markup = 75% x Cost = 0.75 x $76 = $57
The selling price will be the cost plus the markup:
Selling price = Cost + Markup = $76 + $57 = $133.
Therefore, Layla should charge $133 for each necklace.
The answer is d) 133.04, although it should be rounded to the nearest cent, so the final answer would be $133.
Find the x- and y-intercepts of the function f(x) = log(2x + 1) − 1.
The x-intercept of the function f(x) = log(2x + 1) − 1 is
. Its y-intercept is
The x-intercept is (4.5, 0) and y-intercept is (0, -1) for the given function.
What are intercepts ?
Intercepts are the points at which a curve intersects with the x-axis and y-axis on a coordinate plane. The x-intercept is the point where the curve intersects with the x-axis, and its y-coordinate is zero. The y-intercept is the point where the curve intersects with the y-axis, and its x-coordinate is zero. The intercepts provide useful information about the behavior and properties of a curve, such as its roots and symmetry.
According to the question:
To find the x-intercept, we need to set y = 0 and solve for x:
[tex]0 = log(2x + 1) - 11 = log(2x + 1)10 = 2x + 19 = 2xx = 4.5[/tex]
Therefore, the x-intercept is (4.5, 0).
To find the y-intercept, we need to set x = 0 and evaluate the function:
[tex]f(0) = log(2(0) + 1) - 1[/tex]
= 0 - 1[tex]= log(1) - 1[/tex]
= -1
Therefore, the y-intercept is (0, -1).
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-21.5%, 1/3, -4/5, 1.3, 4.5%, -0.04
Pls help I need order from greatest to least
Answer:
Sure, here are the numbers arranged from greatest to least
Step-by-step explanation:
Order from greatest to least
1.3, 4.5%, 1/3, -4/5, -0.04, -21.5%
Answer:
From the greatest to least
Step-by-step explanation:
1.3, 4.5%, 1/3, -4/5, -0.04, -21.5%
You can identify which number is greater than other by using a number line.
What is a number line?
A number line is what a math student can use to find the answer to addition and subtraction questions. A straight line, theoretically extending to infinity in both positive and negative directions from zero, that shows the relative order of the real numbers.
Hope this helps :)
Pls Brainliest...
What are the integer solutions to the inequality below?
−
1
≤
x
≤
3
Answer:
i don't know i haven't done integers in a long time
Step-by-step explanation:
an 8 foot ladder is leaning against a wall. the top of the ladder is sliding down the wall at the rate of 2 ft per second. how fast is the bottom of the ladder moving along the ground at the point in time when the botto of the ladder is 4 feet from the wall
The bottom of the ladder is moving at a rate of 4/3 ft per second.
To solve the problem, we can use the Pythagorean Theorem:[tex]$x^2 + y^2 = 64$[/tex], where x is the distance from the wall to the bottom of the ladder and y is the length of the ladder. We differentiate this equation with respect to time t and use the chain rule to get [tex]$\frac{d}{dt} (x^2 + y^2) = \frac{d}{dt} 64$[/tex]
Simplifying, we get
[tex]$2x \frac{dx}{dt} + 2y \frac{dy}{dt} = 0$[/tex]
When the bottom of the ladder is 4 feet from the wall, we have x = 4 and y = 8, so we can substitute these values into our equation and solve for [tex]$\frac{dx}{dt}$[/tex]:
[tex]$2(4)\frac{dx}{dt} + 2(8)(-2) = 0$[/tex]
[tex]$\frac{dx}{dt} = \frac{16}{8} = \frac{4}{3}$[/tex]
Therefore, the bottom of the ladder is moving at a rate of [tex]$\frac{4}{3}$[/tex] ft/s.
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What is the image point of ( 1 , 8 ) after a translation left 2 units and down 1 unit?
Answer: It should be -1,7
Step-by-step explanation: x=1-2=-1
y=8-1=7
Answer:
(-1, 7)
Step-by-step explanation:
A left translation is a negative number affecting the x-coordinate.
1 - 2 = -1
A down translation is a negative number affecting the y-coordinate.
8 - 1 = 7
(1, 8) --------> (-1, 7)
miguel went to a movie theater and bought a large bag of popcorn that cost $10.49. to avoid spending too much money in all, he determined that he could spend up to $5.51 on a drink. let x represent how much money miguel wanted to spend in all. which inequality describes the problem?
The inequality that represents Miguel's spending limit is $16.00 ≤ x.
Let x represent the total amount of money Miguel wants to spend. We know he spent $10.49 on popcorn and can spend up to $5.51 on a drink.
To find the inequality, we can add these two amounts together and set it less than or equal to x, since x represents the maximum amount he wants to spend. Mathematically, we can write:
$10.49 + $5.51 ≤ x
Simplifying this inequality, we get:
$16.00 ≤ x
This means that Miguel can spend up to $16.00 in total on the popcorn and drink combined. If he spends more than $16.00, he will have exceeded his limit.
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coupling tetraalkylammonium and ethylene glycol ether side chain to enable highly soluble anthraquinone-based ionic species for nonaqueous redox flow battery
Coupling tetraalkylammonium and ethylene glycol ether side chain is an effective method to enable highly soluble anthraquinone-based ionic species for nonaqueous redox flow battery. The side chains of the tetraalkylammonium are modified with the ethylene glycol ether, which is a highly polar solvent, allowing for better solubility in nonaqueous electrolyte solutions. Additionally, the ethylene glycol ether has the ability to modify the stability of the ionic species, preventing aggregation and ensuring the longevity of the battery. This increases the redox capacity and enhances the performance of the flow battery.
The ethylene glycol ether-tetraalkylammonium coupling has been proven to be an effective method for improving the solubility and stability of anthraquinone-based ionic species. For example, it has been observed that the coupling of ethylene glycol ether to anthraquinone-based ionic species enhanced the current density of the battery by more than 3 times. Furthermore, the coupling process has also been found to improve the energy efficiency and storage capacity of the nonaqueous redox flow battery.
Overall, coupling tetraalkylammonium and ethylene glycol ether side chain is an effective method for enabling highly soluble anthraquinone-based ionic species for nonaqueous redox flow battery. This process has been proven to improve the performance of the battery, including current density, energy efficiency, and storage capacity.
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Ronaldo's family drove four and 6/10 killer meters from their house to get to the gas station they drove 2 and 30/100 km from the gas station to the store which expression can be used to determine the number of kilograms Ronaldo's family drove to get all together
Ronaldo's family drove a total of 6.90 kilometres to get from their house to the store.
What expression used to determine number of kilograms?To determine the total distance Ronaldo's family drove, we need to add the distance from their house to the gas station and the distance from the gas station to the store. We can write this as:
[tex]4 6/10 km + 2 30/100 km[/tex]
To add these two distances, we need to find a common denominator for the fractions. The smallest common denominator for 10 and 100 is 100, so we can convert the first distance to an equivalent fraction with a denominator of 100:
[tex]4 6/10 km = 4 60/100 km = 4.60 km[/tex]
Then we can add the two distances:
[tex]4.60 km + 2.30 km = 6.90 km[/tex]
Therefore, Ronaldo's family drove a total of 6.90 kilometres to get from their house to the store.
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the doctor has ordered 1.25 mg/kg of a medication im. it the patient weighs 175 lbs. the drug on hand is available is a vial with 100 mg/2ml. (1) how many mg will be given? (2) calculate the amount to be injected.
1. The amount of medication to be given is 99.25 mg.
2.The amount of 1.985 mL medication should be injected.
To answer the given question, let's follow the steps mentioned below.
Determine the amount of medication to be given:1. Convert the weight of the patient from pounds to kilograms.
175 pounds = 79.4 kilograms
2. Multiply the patient's weight in kilograms by the ordered dosage.
1.25 mg/kg × 79.4 kg = 99.25 mg
Therefore, 99.25 mg of medication is required
Calculate the amount to be injected1. Find the number of milliliters (mL) required to deliver the medication dosage.
The concentration of the drug is 100 mg/2 mL.
100 mg/2 mL ÷ 1 = 50 mg/m
2. Divide the total amount of medication required by the concentration of the drug.
99.25 mg ÷ 50 mg/mL = 1.985 mL
Therefore, 1.985 mL of the medication should be injected.
Note:
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A quality control inspector will measure the salt content (in milligrams) in a random sample of bags of potato chips from an hour of production. Which of the following would result in the smallest margin of error in estimating the mean salt content, u? A. 90% confidence, n = 25 B. 90% confidence, n = 50 C. 95% confidence, n = 25 D. 95% confidence, n = 50 E. n = 100 at any confidence level
The option that would result in the smallest margin of error in estimating the mean salt content, u, is 95% confidence, n = 50. The correct answer is Option D.
What is the margin of error?The margin of error is the amount by which a statistic is expected to differ from the true value of the population parameter. The interval estimate is calculated with the help of a margin of error. The margin of error and the interval estimate are inversely related to each other. If we want a small margin of error, we must increase the sample size.
What is the confidence level?The confidence level is the likelihood that a population parameter will fall within a specified range of values. The confidence level is determined by the sample size and margin of error. The sample size and margin of error are directly related to each other. When the sample size is smaller, the margin of error is larger. When the sample size is larger, the margin of error is smaller.
How to determine the smallest margin of error?The margin of error is the highest at a confidence level of 50%. In general, as the confidence level increases, the margin of error decreases, and vice versa. As the sample size increases, the margin of error decreases. It follows that a 95% confidence level, n = 50 would yield the smallest margin of error in estimating the mean salt content, u. Hence, option D) 95% confidence, n = 50 would result in the smallest margin of error in estimating the mean salt content, u.
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Find the missing of dimension of the cone. Round you answer to the nearest tenth. Volume=13. 4m³
Radius=3. 2m
Height=h
The missing dimension of the cone is its height, which is approximately 2.5 m when rounded to the nearest tenth.
We can use the formula for the volume of a cone, which is:
Volume = (1/3)πr²h
where r is the radius of the base and h is the height of the cone.
We are given the volume of the cone as 13.4 m³ and the radius as 3.2 m. Substituting these values into the formula, we get:
13.4 = (1/3)π(3.2)²h
Multiplying both sides by 3 and dividing by π(3.2)², we get:
h = 3 × 13.4 / π(3.2)²
h ≈ 2.5 m
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the best type of inspection to use is: multiple choice dependent on the nature of the purchase. 100 percent inspection. sequential sampling. continuous sampling.
The best type of inspection to use depends on the nature of the purchase. Each type of inspection has its own advantages and disadvantages, and should be chosen based on the requirements of the product and the level of risk associated with the inspection.
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HELP, PLEASEEEEE :(
The dimensions of a triangular prism are shown below
5cm
12cm
13cm
8cm
What is the total surface area of the prism in square centimeters?
Answer:
Step-by-step explanation:
So we have to do 5+12+13+8 cm having altitude base = 5 cm and 12 cm= 1/2 times base times height = 1/2 times 5 times 12= 30 cm So surface Area of prism= 30 times 8 + 2 times 30 = 160 plus 20 = 180 cmWhat is the volume of the cone expressed in terms of pi?
An environmental agency frequently samples the water in a region to ensure that the levels of a certain contaminant do not exceed 30 parts per billion (ppb). From 12 randomly selected samples of the water, the agency constructed the 99 percent confidence interval (22.5, 28.7). Assuming all conditions for inference are met, which of the following is a correct interpretation of the interval? A For all water in the region, 99 percent of the water contains a level of the contaminant between 22.5 ppb and 28.7 ppb. B We are 99 percent confident that the mean level of the contaminant in the sample is between 22.5 ppb and 28.7 ppb. We are 99 percent confident that the mean level of the contaminant in all the water in the region is between 22.5 ppb and 28.7 ppb. D There is a 0.99 probability that the mean level of the contaminant in the sample is between 22.5 ppb and 28.7 ppb. E There is a 0.99 probability that the mean level of the contaminant in all the water in the region is between 22.5 ppb and 28.7 ppb.
The correct interpretation of the 99 percent confidence interval (22.5, 28.7) is B: We are 99 percent confident that the mean level of the contaminant in the sample is between 22.5 ppb and 28.7 ppb.
This does not indicate that the mean level of the contaminant in all the water in the region is necessarily between 22.5 ppb and 28.7 ppb.
Confidence intervals provide an estimate of the population mean based on a sample. In other words, they indicate the range of values that are likely to include the true mean of the population. Therefore, the interval (22.5, 28.7) indicates that we are 99 percent confident that the mean of the sample (which is used to estimate the true population mean) lies between 22.5 ppb and 28.7 ppb. However, this does not guarantee that the true population mean (i.e., the mean of all the water in the region) lies between 22.5 ppb and 28.7 ppb.
The other answers are incorrect because they do not reflect the fact that the interval provides an estimate of the population mean based on a sample.
Answer A is incorrect because it states that all of the water in the region must contain a level of the contaminant between 22.5 ppb and 28.7 ppb, which is not necessarily true.
Answer D is incorrect because it states that there is a 0.99 probability that the mean of the sample is between 22.5 ppb and 28.7 ppb, when in reality the interval indicates that we are 99 percent confident that the mean of the sample is between 22.5 ppb and 28.7 ppb. Finally,
Answer E is incorrect because it states that there is a 0.99 probability that the true population mean (i.e., the mean of all the water in the region) is between 22.5 ppb and 28.7 ppb, which is not necessarily true.
In summary, the correct interpretation of the 99 percent confidence interval (22.5, 28.7) is that we are 99 percent confident that the mean level of the contaminant in the sample is between 22.5 ppb and 28.7 ppb.
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1 7/8 hours every wednesday
2 3/8 hours every friday
What is total number of hours?
The total number of hours is 30 hours as the sum of 7/8 and 3/8 comes out to be 30 hours.
1) We know that there is a total of 24 hours in a day.
therefore, 7/8 hours of Wednesday =
number of hours in a day = 24
number of hours every Wednesday = 7/8
= 7/8 x 24 hours
= 7 x 3 hours
= 21 hours
7/8 hours every Wednesday means 21 hours every Wednesday.
2) We know that there are a total of 24 hours in a day;
therefore, 3/8 hours of Friday =
number of hours in a day = 24
number of hours every Friday = 3/8
= 3/8 x 24 hours
= 3 x 3 hours
= 9 hours
3/8 hours every Friday means 9 hours every Friday.
therefore, the total number of hours = 21 + 9 = 30
The total number of hours is 30 hours as the sum of 7/8 and 3/8 comes out to be 30 hours.
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Consider the system of equations
below. What is the solution of the
system?
y=4x-8
4x + 2y = 20
Answer:
x = 3, y = 4
Step-by-step explanation:
Substitute 4x - 8 in for y and then solve for x:
4x + 2(4x - 8) = 20
Then, 4x + 8x - 16 = 20 --> 12x = 36 --> x = 3.
Once you have x, you can solve for y.
y = 4x - 8 = 4(3) - 8 = 12 - 8 = 4
So, x = 3, y = 4