hi i need help with this question :)

a) The exponential function that gives the percent P is: P = (0.85)^x.

b) The percentage of light that will pass through a cloth that is 2.75mm thick is given as follows: 63.96%.

A decaying exponential function is defined as follows:

y = a(1 - r)^x.

In which the parameters are given as follows:

The parameter values for this problem are given as follows:

a = 1, r = 0.15.

Hence the function is:

y = (0.85)^x.

The percentage passing through a cloth that is 2.75 mm thick is given as follows:

y = (0.85)^2.75

y = 0.6396.

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The final cost of the laptop be if jamal buys it on saturday is $695.79

Suppose the value of which a thing is expressed in percentage is "a'

Suppose the percent that considered thing is of "a" is b%

Then since percent shows per 100 (since cent means 100), thus we will first divide the whole part in 100 parts and then we multiply it with b so that we collect b items per 100 items(that is exactly what b per cent means).

Thus, that thing in number is

[tex]\dfrac{a}{100} \times b[/tex]

Given;

The new laptop is currently priced at $859

On saturday the store is giving a 25% discount off all laptops

Sales tax on final purchase=8.5%

Now, the final value on saturday be x

x*100/859=25

x=25*859/100

x=214.75

The value will be 859-214.75=644.25

8% of 644.25

x*100/644.25=8

x=8*644.25/100

x=51.54

Final cost= 644.25+51.54

=695.79

Therefore, the final cost after 8 percent sales tax will be $695.79

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The volume of the cuboid is 16 cubic yards.

A cuboid is a solid in three dimensions with six rectangular faces, eight vertices, and twelve edges. Three dimensions, including length, breadth, and height, define a cuboid. A cuboid with integer edges is referred described as being perfect.

Given:

A cuboid with height 2 yards, length 2 yards and width 4 yards.

The volume of the cuboid,

= length x width x height

= 4 x 2 x 2

= 16 cubic yards.

Therefore, the volume is  16 cubic yards.

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The value of X are 5/6,1/5

A linear equation is an equation that has the variable of the highest power of 1. The standard form of a linear equation is of the form Ax + B = 0.A mathematical equation is a statement with two equal sides and an equal sign in between. An equation is, for instance, 4 + 6 = 10. Both 4 + 6 and 10 can be seen on the left and right sides of the equal sign, respectively.

Given;

x ÷ 5/6 = 1....1

x ÷ 2 = 1/10....2

Equation.1

(x/5)*6=1

6x/5=1

x=5/6

Equation.2

x/2=1/10

x=2/10

x=1/5

Therefore, the value of x in equations will be 5/6 and 1/5

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Answer:

[tex]\dfrac{-8y}{y-3}[/tex]

Step-by-step explanation:

[tex]\sf \dfrac{49 - y^2}{6y^2 +42y}=\dfrac{7^2-y^3}{6y^2 +6*7y}\\\\[/tex]

                 [tex]\sf =\dfrac{(7+y)(7-y)}{6y(y + 7)}=\dfrac{(7+y)(7-y)}{6y(7+y)}\\\\\\=\dfrac{7-y}{6y}[/tex]

y² - 10y + 21

sum = -10

Product = 21

Factors = (-7) , (-3)   {(-7)*(-3) = 21  & (-7)+ (-3) = -10}

y² - 10y + 21 = y² - 7y - 3y + 21

                    = y(y - 7) - 3(y - 7)

                   = (y - 7) ( y - 3)

[tex]\sf \dfrac{49 -y^2}{6y^2 + 42y}*\dfrac{48y^3}{y^2 - 10y + 21}=\dfrac{7-y}{6y}*\dfrac{48y^3}{(y-7)(y-3)}\\\\\\[/tex]

                                         [tex]\sf = \dfrac{(-1)(y-7)}{6y}*\dfrac{48y^3}{(y-7)(y-3)}\\\\\\=\dfrac{(-1)*8y^2}{y-3}\\\\\\=\dfrac{-8y^}{y-3}[/tex]

Amanda's explanation is not correct. The growth factor of an exponential function is the constant value that the function is multiplied by for each expansion in the information variable.  

It is not determined by dividing one value in the table by the previous value.

To find the growth factor of an exponential function, one ought to take the proportion of any two consecutive f(x) values and distinguish the normal proportion. The growth factor is equivalent to this normal proportion.

For instance, assuming the function is [tex]f(x) = 2^x[/tex], and the table of values is:

x f(x)

0 1

1 2

2 4

3 8

The growth factor can be tracked down by taking the proportion of f(x) values for consecutive x:

f(1)/f(0) = 2/1 = 2

f(2)/f(1) = 4/2 = 2

f(3)/f(2) = 8/4 = 2

For this situation, the growth factor is 2, meaning that the function is multiplied by 2 for each increase in x.

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A. The variable is qualitative because it is a numerical measure is correct answer.

Any variable that isn't numerical is referred to as a qualitative variable or a category variable. It describes information that falls into a category. for instance: Eye color (variables include: blue, green, brown, hazel).

In statistics, qualitative variables are given nominal scales since they cannot be ordered on a numerical scale. Qualitative variables are exactly what the word "nominal" means: names. No ordering is either conceivable or inferred on a nominal scale (except for alphabetical ordering like New York, Washington, West Virginia or Chelsea, Edinburgh, London). In other words, data are classified according to a category on the nominal scale.

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We randomly take a card, if it is not a, then the probability that it is b, is 1/4.

We have to find the the probability that it is a card of b, if it is not a.

We have total number of cards = 20

The cards of a = 10

The cards of b = 5

The cards of c = 5

We don't select the card a, then;

The probability of choosing card b = The total number of card b/total number of cards

The probability of choosing card b = 5/20

The probability of choosing card b = 1/4

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The coordinates of vertices after dilation by scale factor of 1.5 with center of dilation is D'(3,-3), E'(6,-3) and  F'(1.5,-6).

A dilation is just a transformation which enlarges or contracts the size of a figure. This means that the preimage and image are similar and are scaled up or down using a factor.

The vertices of the triangle are D(2,-2), E(4,-2), F(1,-4).

The origin-centered dilation with a scale factor of k is defined as,

(x,y) → (kx,ky)

As a result, dilation with a scale factor of 1.5 centered at the origin is defined as,

(x,y) → (1.5x,1.5y)

The image's vertices are

D(2,-2) → D'(3,-3)

E(4,-2) → E'(6,-3)

F(1,-4) → F'(1.5,-6)

Therefore the coordinates of vertices after the dilation by the given scale factor 1.5 is D'(3,-3), E'(6,-3) and  F'(1.5,-6).

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Answer:

Step-by-step explanation:

6. XZY

7. YX

the sum is 1) 5/3, 2) 5/6 , 3) 7/10 and the difference is 1) 1/6 , 2)2/15, 3) 1/30. When adding or subtracting fractions with unlike denominators, the first step is to convert the fractions so that they have a common denominator.

1. 1/3+2/3 = 5/3

2. 1/2 + 1/3 = 5/6

3. 2/5+1/2 = 7/10

1. 1/2-1/3 = 1/6

2. 4/5-2/3 = 2/15

3. 4/15-1/10 = 1/30

When adding or subtracting fractions with unlike denominators, the first step is to convert the fractions so that they have a common denominator. To do this, you can use the lowest common denominator, which is the least common multiple of the denominators. For example, in the first problem, the least common multiple of 3 and 2 is 6, so you can convert the fractions to 2/6 and 4/6, or 1/3 and 2/3. Then, you can add or subtract the fractions as normal. For example, 1/3+2/3 would equal 3/3 or 1.

For subtracting fractions with unlike denominators, the same process is used. For example, in the second problem, the least common multiple of 5 and 3 is 15, so you can convert the fractions to 4/15 and 2/15. Then, you can subtract the fractions as normal. For example, 4/15-2/15 would equal 2/15.

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Answer:

0.25 cup of rice; 13 cup of water

Step-by-step explanation:

2 cup of water: 1 cup of rice = 2:1 ratio

The solution for linear equations given will be x=-1 and y=2 using substitution method.

What is a linear equation ?

A linear equation is an equation in which the highest power of the variable is always 1. It is also known as a one-degree equation. The standard form of a linear equation in one variable is of the form

Ax + B = 0

e.g. x-10=0. Here, x is a variable, A is a coefficient and B is constant.

The standard form of a linear equation in two variables is of the form

Ax + By = C

e.g. 2x-4y=10. Here, x and y are variables, A and B are coefficients and C is a constant.

Now

Given 4x+3y=2 -->1

x-2y=-5 --->2

Using substitution method, In this method, first, solve the equation for one variable, and substitute the value of the variable in the other equation.

From 2,  x=2y-5

Put x=2y-5 in 1

4(2y-5)+3y=2

11y-20=2

y=22/11

y=2

Hence,

           x=2*2-5

             x= -1

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Mary's Tuesday distance is 1/8 times her Monday distance

On Monday Mary ran 1 3/5 miles

= 8/5

On Tuesday Mary ran 1/5 miles

Therefore the number of times her Tuesday distance was her Monday distance can be calculated as follows

1/5 ÷ 8/5

= 1/5 ×5/8

= 1/8

Hence her Tuesday distance was 1/8 times her Monday distance

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Answer:

Start at 1 on y-intercept and go down 2 units and right 1 unit

Step-by-step explanation:

First you have to graph your y-intercept (1) *which is the red dot in the graph I made for you*

Then you must use your slope (-2) to graph the rest

Since your slope is negative you have to go down from your y-intercept. In your case you are going down 2 units from your intercept. And since your slope is a whole number instead of a fraction you just go to the right 1 unit to make the coordinate (1,-1).

That is how you graph your equation.

I hope this helped!

Answer:

C. gaining confidence

The graph that passes through the points (4,16) and (6,12) , the equation of trend line is K = -2J + 24 .

A linear relationship is depicted by a trend line. Y = mx + b, where x is the independent variable, y is the dependent variable, m is the slope of the line, and b is the y-intercept, is the equation for a linear relationship.

a graph line indicating the general path that a collection of points appears to take.

When plotting predictions, trendlines, also referred to as lines of best fit or regression lines, are frequently used to graphically represent trends in data series. Typically, a trendline is a line or curve that crosses or links two or more points in a series to indicate a trend.

From the graph that passes through the points (4,16) and (6,12) , the equation of trend line is K = -2J + 24.

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The probability of selecting sticks with a boy's name is 8/13 and the probability of selecting sticks with a girl's name is 2/5.

Now, According to the question:

Formula to find the probability of an event:

"P(A) = n(A) / n(S)

where, n(A) is the number of favorable outcomes of an event A

n(S) is the total number of outcomes for an experiment"

"Information available from the question"

Total number of students are,

n(S) = 10 + 16

n(S) = 26

Let event A: selecting first stick with a boy name

n(A) = 16

So, the probability of a boy is,

P(A) = n(A)/n(S)

P(A) = 16/26

P(A) = 8/13

if the first stick is not replaced, then n(S) would be,

26 - 1 = 25

Let event A: selecting first stick with a boy name

n(B) = 10

So, the probability of a boy is,

P(B) = n(B)/n(S)

P(B) = 10/25

P(B) = 2/5

Therefore, the probability of selecting sticks with a boy's name is 8/13 and the probability of selecting sticks with a girl's name is 2/5.

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Given the information, the triangle congruence prove is explained below.

If the corresponding sides or measure of angles of two or more triangles have common properties, then the triangles are said to be congruent. Such that on comparing their sides and internal angles, some have equal values.

With the given information in the question, the prove is explained below:

               STATEMENTS                         REASONS

1. AB ≅ CD                                             Given

2. <ABD ≅<CDB                                    Given

3. AD ≅ BC                                            Equal sides of a parallelogram

4. <ADB ≅ <CBD                                   Alternate angle theorem

5. <A ≅ <C                                             Opposite property of a parallelogram

Therefore, it can be deduced that;

ΔABD ≅ ΔCDB

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Answer:

97 inches

Step-by-step explanation:

Using law of sines, we know that y/sin∠Y = z/sin∠Z.

Solve:

[tex]\frac{500}{sin117}[/tex] = [tex]\frac{z}{sin10}[/tex]

Therefore, z = (500/sin117)(sin10)

Enter this into a calculator to get:

z = 97.44495296, which rounds to 97 inches.

I hope this helps! :D

Answer: x = -8

Step-by-step explanation:

12 ( x + 10 ) = 24

First we divide the two sides of the exercise by 12.

[tex]\boldsymbol{\sf{x+10=\dfrac{24}{12} }}[/tex]

We divide 24 by 12..

x + 10 = 2

Subtract 10 from both sides.

x = 2 - 10

Subtract 10 from 2 to get. Since the number 10 is greater than 2, the result will be negative.

x = -8

Answer:

[tex] \sf \: x = - 8[/tex]

Step-by-step explanation:

Given equation,

→ 12(x + 10) = 24

Now the value of x will be,

→ 12(x + 10) = 24

→ 12(x) + 12(10) = 24

→ 12x + 120 = 24

→ 12x = 24 - 120

→ 12x = -96

→ x = -96 ÷ 12

→ [ x = -8 ]

Hence, the value of x is -8.

The total amount spent by John is $37.78.

Given is that John goes to a restaurant and has a bill of 32.57. He uses a 10% off coupon on the cost of the meal. The tax is 8%. He leaves a tip of 18% on the amount before the coupon or tax is applied.

Amount left as a tip -

{t} = 18% of 32.57

{t} = 18/100 x 32.57

{t} = 5.87

Amount included in tax -

8% of 32.57

8/100 x 32.57

2.61

Billed amount after coupan is applied -

10% of 32.57

10/100 x 32.57

$3.26

Amount spend -

(32.56 - 3.26) + 2.61 + 5.87

$37.78

Therefore, the total amount spent by John is $37.78.

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The distance between PQ : 7

    Given  points  P: (1,6)

                            Q : (7,2)

   distance between two points formula is : √(x2-x1)^2 + (y2-y1)^2

    (x1,y1)= (1,6)

    (x2,y2) = (7,2)

    therefore

                  =  √(7-1)^2 +(2-6)^2

                  = √36+16

                  = √52

                  = 7.211

Answer:

60

Step-by-step explanation:

You're not slow.

So given was the formula for perimeter

12x + 1/2 - 4x - 8.5 + 2x + 8

They want you to find perimeter is x = 6, so this is a matter of plug and play. so everywhere you see an x, you'll replace it with the number 6

And we will start simplifying what we can

P = 12(6) + 1/2 - 4(6) - 8.5 + 2(6) + 8

P = 72 + 0.5 - 24 - 8.5 + 12 + 8

P = 72 - 24 - 8 + 12 + 8

P = 72 - 12

P = 60

The simplest form of the expression is given as 12 + 6√3.

We know that when we are asked to simplify in mathematics, they are asking us to write the expression in the simplest form that the expression can be in. In this case, we are to simplify 6/2 - √3.

Then we would now have to multiply the numerator and the denominator by the conjugate of the denominator such that we have;

6/2 - √3 * 2 + √3/2 + √3

12 + 6√3/4 +2√3 - 2√3 - 3

12 + 6√3/1

12 + 6√3

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Step-by-step explanation:

I am not sure what you mean. you don't round the intermediate numbers and results. only the final result.

you keep the irrational terms (like square root) like variable terms as they are and apply operations on them without actually expressing them as numbers.

only at the very last moment (when the final result is calculated) would you express them as actual number. and then you round the final result.

so, this is solved via Pythagoras :

c² = a² + b²

c being the Hypotenuse (the side opposite of the 90° angle), a and b are the legs.

in our case we have

BP² = BN² + NP² = 7² + sqrt(95)² = 49 + 95 = 144

you see ?

no need ever to bring the actual result of sqrt(95) into the picture. just keep it at sqrt(95) and do with it, what you would do with any actual number.

BP² = 144

BP = sqrt(144) = 12

so, we never had to deal with the actual irrational number.

we know how it is created, so we keep using that term to represent it.

John will be able to meet the goal of practicing piano for mentioned time on Saturday and Sunday.

Required amount of practice = [tex]2 \frac{1}{2} [/tex] hours

Required amount of practice = (2×2)+1/2

Required amount of practice = 5/2 hours

Required amount of practice = 2.5 hours

Practice performed on Saturday = [tex]1 \frac{1}{6} [/tex]

Practice performed on Saturday = (6×1)+1/6

Practice performed on Saturday = 7/6 hours

Practice performed on Sunday = [tex]1 \frac{1}{4} [/tex]

Practice performed on Sunday = (4×1)+1/4

Practice performed on Sunday = 5/4 hours

Combined practice performed = 7/6 + 5/4

Combined practice performed = 1.2 + 1.3

Performing addition

Combined practice performed = 2.5 hours

The performed practice is equal to the goal and hence he will meet the goal.

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Answer: t = 10.50c

Step-by-step explanation: The relationship between the number of climbs, c, and the total cost, t, is proportional. This means that the ratio of t to c is constant. One way to represent this relationship is through an equation of the form:

t = kc

where k is a constant of proportionality. In this case, we know that 5 climbs cost $52.50, so we can use this information to find the value of k:

52.50 = k(5)

k = 52.50/5 = 10.50

So the equation that represents the total cost, t, of c climbs is:

t = 10.50c

Where t is the total cost, c is the number of climbs and 10.50 is the constant of proportionality.

After n years Alex will earn salary which can be expressed as $(1 + 0.03)^n * 35,000.

The total amount Alex has earned in his first year of his career is $35,000.

In the second year of his career, he gets a 3% raise, which is an increase of 3/100 * $35,000 = $1,050.

So his salary for the second year is $35,000 + $1,050 = $36,050.

In the third year of his career, he again gets a 3% raise, which is 3/100 * $36,050 = $1,081.50

So his salary for the third year is $36,050 + $1,081.50 = $37,131.50

We can see that for each year, his salary is increasing by a fixed percentage of the previous year's salary.

This pattern can be represented by the expression:

(1 + 0.03)^n * 35,000

Where n is the number of years since the start of his career. This expression gives the total amount Alex has earned in his first n years of his career.

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