PLEASE DO QUESTIONS 1 AND 2! I WILL GIVE BRAINLEST!!!!

The real values of $c$ for which $x^2 + 16x + c$ is the square of a binomial are $64$ and $0$.

To find these values, we can use the concept of completing the square. For a quadratic expression to be the square of a binomial, the coefficient of the linear term ($16x$) must be twice the product of the square root of the constant term ($c$) and the square root of the coefficient of the quadratic term ($1$). In this case, the coefficient of the linear term is $16$ and the coefficient of the quadratic term is $1$. So, we have $16 = 2\sqrt{c}\sqrt{1}$.

Simplifying this equation gives $16 = 2\sqrt{c}$. Dividing both sides by $2$ yields $\sqrt{c} = 8$. Squaring both sides gives $c = 64$. Thus, $c = 64$ is one possible value.

Additionally, if we consider the case when $c = 0$, the quadratic expression becomes $x^2 + 16x + 0 = (x + 8)^2$. Therefore, $c = 0$ is another possible value.

In summary, the real values of $c$ for which $x^2 + 16x + c$ is the square of a binomial are $64$ and $0$.

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Answer:

The angle of elevation from you to the top of the skyscraper is approximately 56.2 degrees.

Step-by-step explanation:

The automaton starts in the initial state q0, reads the input string w, and uses the stack to keep track of the non-terminals in the production rules.

To reduce the given CFG to Greibach Normal Form (GNF), we can follow these steps:

Step 1: Eliminate the start symbol from the right-hand side of any production by introducing a new non-terminal symbol S0 and a new production S0 → S.

S0 → S

S → CA

A → BB

B → SB

S → CBA

S → a

Step 2: Eliminate the productions with more than one non-terminal on the right-hand side.

S0 → S

S → CAA1

A1 → BA2

A2 → SB

B → SB

S → CBAA3

A3 → a

Step 3: Convert the remaining productions into GNF form by replacing the first non-terminal symbol on the right-hand side with a terminal symbol or a new non-terminal symbol.

S0 → S

S → CAZ

Z → AZ

A → BBY

Y → SB

B → SB

S → CBAW

W → A3

A3 → a

The resulting CFG is in Greibach Normal Form.

To define the condition for acceptability of strings using final state and null stack method, we need to consider the corresponding pushdown automaton. If the automaton reaches a final state and the stack is empty, then the input string is accepted.

Formally, let P = (Q, Σ, Γ, δ, q0, Z0, F) be a pushdown automaton, where Q is the set of states, Σ is the input alphabet, Γ is the stack alphabet, δ is the transition function, q0 is the initial state, Z0 is the initial stack symbol, and F is the set of final states.

A string w ∈ Σ* is accepted by P using final state and null stack method if there exists a sequence of configurations

(q0, w, Z0) ⇒* (qf, ε, ε)

such that qf ∈ F and the stack is empty.

In other words, the automaton starts in the initial state q0, reads the input string w, and uses the stack to keep track of the non-terminals in the production rules. If it reaches a final state qf and the stack is empty, then the input string w is accepted.

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It would also increase the computational complexity of the algorithm.

To use distance-weighted 2-nearest neighbors, we need to find the two nearest neighbors to a given point, weight them by their distances from the point, and then use their weighted average to approximate the function at that point. For the region 3 ≤ x ≤ 5, the two nearest neighbors to any point x would be (3.0, 5.0) and (5.0, 5.0).

The distance-weighted average approximation of f(x) in this region is:

f(x) ≈ (w1f(3) + w2f(5)) / (w1 + w2)

where w1 and w2 are the weights given to the two nearest neighbors, which are inversely proportional to their distances from x:

w1 = 1 / |x - 3.0|^2

w2 = 1 / |x - 5.0|^2

Substituting in the given values, we get:

f(x) ≈ [(1/|x-3.0|^2)*5.0 + (1/|x-5.0|^2)*5.0] / [(1/|x-3.0|^2) + (1/|x-5.0|^2)]

To find the value x = Xo at which the maximum error is made, we need to find the value of x in the region 3 ≤ x ≤ 5 that maximizes the absolute difference between f(x) and f(x). We can do this by taking the derivative of the absolute difference with respect to x and setting it equal to zero:

d/dx |f(x) - f(x)| = d/dx |8x - 10 - x^2 - f(x)| = 0

Solving for x, we get:

x = 3.8 or x = 4.2

To determine which of these values of x gives the maximum error, we can simply evaluate |f(x) - f(x)| at each point:

|x=3.8| = |(1/0.04)*3.0 + (1/0.04)5.0 - (1/0.16)(-1.24)| = 10.74

|x=4.2| = |(1/0.04)*5.0 + (1/0.04)5.0 - (1/0.04)(-3.56)| = 13.96

Therefore, the maximum error occurs at x = 4.2, where the absolute difference between the actual function value and the distance-weighted 2-nearest neighbor approximation is 13.96.

If we use distance-weighted 4-nearest neighbors instead, we would use the four nearest neighbors to each point, weight them by their distances, and then take their weighted average. This would likely reduce the error at x = Xo, since using more neighbors reduces the influence of any single neighbor on the approximation. However, it would also increase the computational complexity of the algorithm.

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If a point (x,y) is equidist point from the point (2,3) and (6,1) then the equation of locus is given by 2x -y =6

Using distance formula, the distnace between point (x, y) and (2, 3) is,

d₁ = √[(2 - x)² + (3 - y)²]

And  the distnace between point (x, y) and (6, 1) is,

d₂ = √[(6 - x)² + (1 - y)²]

A point (x,y) is equidist point from the point (2,3) and (6,1)

⇒ d₁ = d₂

⇒  √[(2 - x)² + (3 - y)²] = √[(6 - x)² + (1 - y)²]

⇒ (2 - x)² + (3 - y)² = (6 - x)² + (1 - y)²

⇒ 4 - 4x + x² + 9 - 6y + y² = 36 - 12x + x² + 1 - 2y + y²

⇒ -4x + 12x - 6y + 2y = 37 - 13

⇒ 8x - 4y = 24

⇒ 2x -y = 6

Hence proved.

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The complete question is:

if a point (x,y) is equidist point from the point (2,3) and (6,1) show that the equation of locus is given by 2x -y = 6

Every composite number has at least one natural number factor other than 1 and itself. The correct answer is option D.

A composite number is a natural number larger than one that is not a prime number, implying that it has at least one element other than 1 and itself.

As a result, every composite number has at least one natural number factor that is neither 1 nor itself.

The smallest natural number that can divide all of the numbers in the integer list is 1.

When we divide a number by itself, we obtain 1 as the component.

Hence, the correct answer is option D.

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The complete question is as follows:

What is 1 of a natural number factor?

A. every

B. odd

C. even

D. composite

The function f(x) is increasing for all x < 3. Then the correct option is A.

Given that:

Function, f(x) = (x + 6) / (x² - 9x + 18)

A function is an assertion, concept, or principle that establishes an association between two variables. Functions may be found throughout mathematics and are essential for the development of significant links.

Simplify the function, then we have

f(x) = (x + 6) / (x² - 9x + 18)

f(x) = (x + 6) / (x² - 6x - 3x + 18)

f(x) = (x + 6) / [x(x - 6) - 3(x - 6)]

f(x) = (x + 6) / (x - 6)(x - 3)

The graph is given below.

The function f(x) is increasing for all x < 3. Then the correct option is A.

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The value of the equation 5- c  for c = 3 will be  2.

Since the solution of an equation refers usually to the values of the variables involved in that equation which if substituted in place of that variable would give a true mathematical statement.

We need to find the solutions does the equation 5 - c for c = 3;

Now solving for c;

5-c

for c = 3

5 - 3 = 2

Therefore, the value is 2.

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a) The mean value of the variable x is defined as the weighted average of x over the interval [x, x + dx], where the weights are given by the probability density function P(x). Mathematically, it is expressed as x = ∫x(x+dx) P(x) dx

b) The variance of the variable x, denoted by σ², is defined as the weighted average of the squared deviations of x from its mean value, where the weights are given by the probability density function P(x). Mathematically, it is expressed as σ² = ∫(x-x)2 P(x) dx

c) The standard deviation of the variable x, denoted by o, is the square root of the variance. Mathematically, it is expressed as σ = √σ² These definitions hold true for any normalized probability density function of the variable x over the interval [x, x + dx].

Given a normalized probability density function P(x) of finding the variable x in the interval [x, x + dx], the definitions for the mean value, variance, and standard deviation are as follows:

a) The mean value (µ) of the variable x is defined as the expected value, which can be calculated using the integral:
µ = ∫xP(x)dx, where the integral is taken over the entire range of x.

b) The variance (σ²) is defined as the average squared deviation from the mean value (µ). It can be calculated using the integral:
σ² = ∫(x - µ)²P(x)dx, where the integral is taken over the entire range of x.

c) The standard deviation (σ) of the variable x is defined as the square root of the variance:
σ = sqrt(σ²)

These definitions will help you analyze the given probability density function and understand its central tendency and dispersion.

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Yes, there is a rigid transformation that would map ΔABC to ΔDEC

From the question, we have the following parameters that can be used in our computation:

The triangles ABC and DEC

From the figure of the the triangles, we can see that

The triangles can be rotated to map one over the other

This is because the triangles have two congruent angle and two congruent sides i.e. they are similar by SAS

Hence. there is a rigid transformation that would map ΔABC to ΔDEC

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The first four terms of the sequence are 5, -4, 14, and -22.

We have,

The first term is given as a_1 = 5.

To find the next term, we use the formula:

a_n = -2a_(n-1) + 6.

Now,

a_2

= -2a_1 + 6

= -2(5) + 6

= -4

For the third term:

a_3 = -2a_2 + 6 = -2(-4) + 6 = 14

And for the fourth term:

a_4

= -2a_3 + 6

= -2(14) + 6

= -22

Thus,

The first four terms of the sequence are 5, -4, 14, and -22.

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The domain of the function is all real numbers and  range is  y ≥ -1.

Since the vertex is at (1,-1), the axis of symmetry is x = 1.

This means that the domain of the function is all real numbers.

To find the range, we need to consider the y-values of the graph. Since the vertex is the lowest point of the graph, the range must be all y-values greater than or equal to -1.

However, since the parabola opens upwards, there is no upper bound on the y-values.

Therefore, the range is given by y ≥ -1.

Hence, the domain of the function is all real numbers and  range is  y ≥ -1.

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Answer:

To solve the differential equation 2y^2 cos(x)dx + (4 + 4y sin(x))dy = 0, we can use the method of integrating factors.

First, we can rearrange the equation as:

2y^2 cos(x)dx = - (4 + 4y sin(x))dy

Dividing both sides by y^2(4 + 4sin(x)), we get:

-2cos(x)/y^2 dx + (1 + sin(x))/y dy = 0

Now we can identify the coefficients of dx and dy as -2cos(x)/y^2 and (1 + sin(x))/y, respectively.

To find the integrating factor, we can use the formula:

μ(x) = exp[∫P(x)dx]

where P(x) is the coefficient of dx. In this case, we have:

P(x) = -2cos(x)/y^2

So we need to integrate P(x) with respect to x:

∫P(x)dx = -2∫cos(x)/y^2 dx = 2sin(x)/y^2 + C

where C is an arbitrary constant.

Therefore, the integrating factor is:

μ(x) = exp[2sin(x)/y^2 + C]

Multiplying both sides of the differential equation by the integrating factor, we get:

-2cos(x) exp[2sin(x)/y^2 + C] dx/y^2 + (1 + sin(x)) exp[2sin(x)/y^2 + C] dy/y = 0

Now we can rewrite this equation as a total derivative:

d/dx [exp[2sin(x)/y^2 + C]/y] = 0

Integrating both sides with respect to x, we get:

exp[2sin(x)/y^2 + C]/y = D

where D is a constant of integration.

Solving for y, we get:

y = sqrt[2sin(x)/(D - exp[2sin(x)/y^2 + C])]

This is the general solution to the differential equation. The constant D and C can be determined from initial or boundary conditions, if given.

The general solution to the differential equation is:

-y^2 ln|4 + 4y sin(x)| = y + C

where C = C1 + C2.

To solve the differential equation 2y^2cos(x)dx + (4 + 4y sin(x))dy = 0, we first need to check whether it is a homogeneous equation or not. A homogeneous equation is one where all the terms have the same degree. In this case, we have a term with x and a term with y, so it is not homogeneous.

Next, we can check whether it is a separable equation or not. A separable equation is one where we can write it in the form f(x)dx = g(y)dy. We can rearrange the equation as:

2y^2cos(x)dx = - (4 + 4y sin(x))dy

Dividing both sides by (4 + 4y sin(x)) and rearranging, we get:

-2y^2cos(x) / (4 + 4y sin(x)) dx = dy

Now, we can integrate both sides with respect to their respective variables:

∫ -2y^2cos(x) / (4 + 4y sin(x)) dx = ∫ dy

To solve the integral on the left-hand side, we can use the substitution u = 4 + 4y sin(x), which gives du/dx = 4y cos(x) and du = 4y cos(x)dx. Substituting this into the integral, we get:

∫ -y^2 / u du = -y^2 ln|u| + C1

Substituting back u = 4 + 4y sin(x), we get:

∫ -y^2 / (4 + 4y sin(x)) du = -y^2 ln|4 + 4y sin(x)| + C1

Integrating the right-hand side with respect to y, we get:

∫ dy = y + C2

Therefore, the general solution to the differential equation is:

-y^2 ln|4 + 4y sin(x)| = y + C

where C = C1 + C2.

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To find the maximum possible area of a triangle with a given sum of base and height, we will use the formula for the area of a triangle:

Area = 1/2 × base × height

Given that the sum of base and height is 12cm, let's denote base as "b" and height as "h". We have:

b + h = 12

To maximize the area, we want to maximize the product of base and height. From the given equation, we can express height as:

h = 12 - b

Now, let's substitute this into the area formula:

Area = 1/2 × b × (12 - b)

To find the maximum area, we will find the critical points of this equation by taking the derivative with respect to b:

d(Area)/db = 1/2 × (12 - 2b)

Set the derivative equal to zero and solve for b:

0 = 1/2 × (12 - 2b)
0 = 12 - 2b
b = 6

Now that we have the base, we can find the height using the given equation:

h = 12 - b
h = 12 - 6
h = 6

So, the maximum possible area of the triangle is:

Area = 1/2 × 6 × 6 = 18 cm²

To summarize:

a) The maximum possible area of the triangle is 18 cm².
b) The base and height of the triangle found in (a) are both 6 cm.

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The length of AB in simplest radical form is 8.06.

We can find the length of AB using the principle of similar triangles on the triangles ABD and ABC.

Considering triangle ABD, given that AD = 5 then

Cos A = AD/AB

Also,

Cos A = AB/AC

Given that AD = 5, AC = 13, AB = x

therefore,

x/13 = 5/x

x² = 65

x = √65

= 8.06

Hence, the length of AB in simplest radical form is 8.06.

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Part A: The given evidence is convincing to provide the true proportion regarding the attendees.

Part B: The error is a type 1 error in the hypothesis testing.

Type 1 Error and Type 2 Error

A type 1 error in hypothesis testing occurs when a null hypothesis is rejected when it is true.

A type II error in hypothesis testing occurs when the investigator fails to reject the null hypothesis that is actually false.  

Given that,

the total number of attendees who ordered fish is 1000.

And, The random selection for the sample size of the attendees who ate fish is 80 of which 64 people got sick.

Hence, The number of attendees who ate the fish and got sick is calculated as given below.

No. of attendees = 64/80

% of No. of attendees = 64/80 x 100

% of No. of attendees = 80%

The random selection for the sample size of the attendees who did not eat fish is 60 of which 39 people got sick.

The number of attendees who did not eat the fish and got sick is calculated as given below.

No. of attendees  = 39/60

% of No. of attendees = 39/60 x 100

% of No. of attendees = 65%

Hence, For Part A;

The given evidence is convincing to provide the true proportion of all attendees who ate the fish that got sick is more than the true proportion of all attendees who did not eat the fish that got sick.

For Part B;

The mistake here is that the doctor's theory (hypothesis) got rejected regarding the number of attendees who ate the fish got sick than those who did not eat the fish.

This error is a type 1 error in the hypothesis testing.

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A graph which represent the points (-1, -3) and (1, -2) is shown in the image below.

In Mathematics and Geometry, an ordered pair is a pair of two elements or data points that are commonly written in a fixed order within parentheses as (x, y), which represents the x-coordinate (abscissa) and the y-coordinate (ordinate) on the coordinate plane of any graph.

Based on the cartesian coordinate (grid) below, the coordinates points and quadrants should be identified as follows;

Point (-1, -3) → quadrant 3.

Point (1, -2) → quadrant 4.

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Complete Question:

Plot the points (-1, -3) and (1, -2)

The P-value is less than a = 0.01, and they should conclude that there is a difference between the proportions.

The confidence interval for the difference between the proportion of male and female drivers who have received a speeding ticket is (0.011, 0.087), which means that we are 99% confident that the true value of the difference in proportions falls within this interval.

To test the null hypothesis H: PM = Pw versus H: PM ≠ Pw, we need to see if the confidence interval includes the null value of 0. If it does not, then we can reject the null hypothesis and conclude that there is a significant difference between the proportions of male and female drivers who have received a speeding ticket.

Since the confidence interval does not include the null value of 0, we can conclude that there is a significant difference between the proportions of male and female drivers who have received a speeding ticket. The P-value is less than a = 0.01, which means that the probability of obtaining a difference in proportions as extreme as or more extreme than the one observed, assuming that the null hypothesis is true, is less than 0.01. Therefore, we reject the null hypothesis and conclude that there is a statistically significant difference between the proportions of male and female drivers who have received a speeding ticket. The correct answer is c. The P-value is less than a = 0.01, and they should conclude that there is a difference between the proportions.

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The given statement "Quantitative Easing was used extensively in the aftermath of the(the late 1990s/2000s) dot com crisis is false because Quantitative Easing was not used extensively in the aftermath of the dot com crisis in the late 1990s/2000s.

Quantitative easing (QE) was not used extensively in the aftermath of the dot-com crisis in the late 1990s and early 2000s. In fact, QE as a monetary policy tool gained prominence after the global financial crisis of 2008. The dot-com crisis primarily affected the technology sector, causing a stock market downturn, but it did not lead to a widespread financial crisis that would have necessitated the use of QE.

Therefore, the given statement is false.

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The radius of the figure is 2√2.

We have,

From the figure,

The right angle triangle.

One angle is 90 and the other two angles will be the same. ie. 45

Now,

The sides opposite to the equal angles are the same.

From the figure,

Side = 2

Now,

Applying the Pythagorean theorem,

radius² = side² + side²

radius² = 2² + 2²

radius² = 4 + 4

radius = √8 = 2√2

Thus,

The radius of the figure is 2√2.

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a) The parameter of interest is the percentage of mail items received at the dorm that are considered packages. This can be denoted as p, where p is the proportion of packages out of all mail items received at the dorm. A confidence interval would be most appropriate for this inference procedure.

b) The parameter of interest is the difference in the average number of packages sent from online retailers to a neighborhood in Champaign and the average number of packages sent from online retailers to a neighborhood in Urbana. This can be denoted as μ1 - μ2, where μ1 is the average number of packages sent to Champaign and μ2 is the average number of packages sent to Urbana. A hypothesis test would be most appropriate for this inference procedure.

c) The parameter of interest is the difference in store pick-up rates between all cookies and all cakes sold by the bakery. This can be denoted as p1 - p2, where p1 is the proportion of cookies that are picked up in store and p2 is the proportion of cakes that are picked up in store. A confidence interval would be most appropriate for this inference procedure.

d) The parameter of interest is the association between the weight of the package and the delivery time. This can be denoted as ρ, where ρ is the correlation coefficient between the weight of the package and the delivery time. A hypothesis test would be most appropriate for this inference procedure.

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The approximate amount of area in the circle is 113.04 square feet.

The area of a circle is given through the expression [tex]A = \pi r^2[/tex], in which π is about equal to 3.14, and r is the radius of the circle.

In this instance, we are given the diameter of the circle, that is 12 feet. The radius of the circle is half of the periphery, so the radius is

r = 12 / 2 = 6 feet

Now, we're suitable to use the methodology for the area of a circle to discover the approximate amount of space within the circle

[tex]A = \pi r^2 = 3.14 * 6^2 = 3.14 * 36 \approx 113.04[/tex] square feet[tex]A = \pi r^2[/tex]

Accordingly, the approximate amount of area in the circle is 113.04 square feet.

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The results in polar form is cos(0.573) + j sin(0.783). The solution for y is 0.866 +0.5. The Laplace transform is F(s) = 5 / (s² + 25) and F(s) = (-2 / s²) + (2 / (s² + 1)), respectively.

To evaluate cos(0.573+j0.783), we use the polar form of a complex number

cos(θ) + j sin(θ).

Therefore, we have

cos(0.573+j0.783) = cos(0.573) + j sin(0.783).

To solve for

y= cos2x + jsinycosy - sin2x = 0.866 + 0.5,

we can use the trigonometric identity cos(2x) - sin(2x) = 1.

Substituting this into the equation gives:

cos(2x) + jsin(y)cos(y) - (cos(2x) - sin(2x)) = 0.866 + 0.5.

Simplifying this equation results in

jsin(y)cos(y) + sin(2x) = 0.866 + 0.5.

The Laplace transform of f(t) = sin(5t) is F(s) = 5 / (s² + 25), where s is the Laplace variable.

The Laplace transform of f(t) = -2t + 2sin(t) is F(s) = (-2 / s²) + (2 / (s² + 1)), where s is the Laplace variable.

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Answer:

[tex]12w \geqslant 150[/tex]

[tex]w \geqslant 12.5[/tex]

So Jordan needs to save $12 a week for at least 13 consecutive weeks.

Answer: 23/45 or 0.51 rounded to the nearest hundredth

Step-by-step explanation:

4 1/9 can be written as 37/9, and 3 3/5 can be written as 18/5.

37/9-18/5 = (185/45) - (162/45) = 23/45 or 0.51

Regarding the cylindrical designs, it is recommended that Kevin choose the first design, which takes around 108.35 square inches of plastic. Kevin does not have enough plastic to build the second design since it needed around 431.97 square.

Here we used the surface area formula for cylinders.

Surface Area = 2πr² + 2πrh

R is the base and h is the height.

For First Design we have

Diameter (d) = 2r = 3

so r = 1.5

So Surface Area = 2π(1.5)² + 2π(1.5) (10)

SA First Cylinder = 108.35

Repeating the same step for the second cylinder we have:

SA 2ndCylinder = 431.97

Thus, the conclusion we have above is the correct one because:

108.35in² <  205in² > 431.97in²

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Answer: :)

The correct answer is C. A scalene triangle is a triangle with no sides that are the same length. This means that all three sides of a scalene triangle have different lengths. In addition, a scalene triangle does not have any angles that are congruent. This is in contrast to an isosceles triangle, which has two sides of equal length, and an equilateral triangle, which has all three sides of equal length.

Step-by-step explanation:

We can use the sample proportion of tankers without spills (146/211 = 0.692) to estimate the population proportion of tankers without spills. To construct the confidence interval, we need to find the margin of error and the critical value for an 80% confidence level.

Follow these steps:

1. Calculate the sample proportion:
In the sample of 211 tankers, 146 did not have spills, so 211 - 146 = 65 tankers had spills. The sample proportion (p-hat) is the number of tankers with spills divided by the total sample size:
p-hat = 65/211 ≈ 0.308

2. Determine the z-score for an 80% confidence interval:
Using a z-table or calculator, the z-score for an 80% confidence interval is approximately 1.282.

3. Calculate the standard error:
The standard error (SE) can be calculated using the formula: SE = sqrt(p-hat*(1-p-hat)/n)
SE = sqrt(0.308*(1-0.308)/211) ≈ 0.030

4. Construct the confidence interval:
Lower limit = p-hat - (z-score * SE)
Upper limit = p-hat + (z-score * SE)

Lower limit = 0.308 - (1.282 * 0.030) ≈ 0.277
Upper limit = 0.308 + (1.282 * 0.030) ≈ 0.339

So, the 80% confidence interval for the population proportion of oil tankers that have spills each month is approximately (0.277, 0.339), rounded to three decimal places.

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Answer:

Math is a broad field that encompasses several branches, each with its own units of measurement. Some examples of units in math include:

In geometry:- Units of length, such as meters, centimeters, and inches

Units of area, such as square meters, square centimeters, and square feet

Units of volume, such as cubic meters, cubic centimeters, and cubic feet- Units of weight or mass, such as kilograms, grams, and pounds - Units of time, such as seconds, minutes, and hours

Units of temperature, such as Celsius and

Fahrenheit

Units of angle measurement, such as degrees and radians

Units of speed or velocity, such as meters per second or miles per hour

Units of frequency, such as Hertz or cycles per second

Units of energy or work, such as joules, calories, and foot-pounds

Units of power, such as watts and horsepower

These are just a few examples of the many units used in math. The type of unit used depends on the specific problem or application.

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Step-by-step explanation:

Area of trapezoid  height x average of bases

   area = (x+2)  * ( 12-4x + 12)/2

           = (x+2) (12-2x) =  12x -2x^2 +24 -4x

      area = -2x^2 +8x+24      will be a maximum at x = - b/2a = -8/(2*-2) = 2

x=2

Max area = 32 ft^2