help please, i’ll mark brainliest

Answer:

4x² + 22x - 12

Step-by-step explanation:

A = bh/2

A = (4x - 2)(2x + 12)/2

A = (8x² + 48x - 4x - 24)/2

A = (8x² + 44x - 24)/2

A = 4x² + 22x - 12

Answer:

not true....

assume $100 start.

in year 1 you are at $108 (up 8%)

in year 2  $108(.98) ... that is 2% down = 105.84...

thus your profit is up only 5.84% over the two years

Step-by-step explanation:

Answer:

56 degrees

Step-by-step explanation:

Here, I think you just accidentally put the value for the angle ZWX, which would be ZWP+PWX(56+56).

You actually already wrote it on the paper, so nothing wrong with your math here, just a thinking error :)

The expression that represent the perimeter of the triangle is 3d² - 4d + 1.

The perimeter of any two-dimensional figure is simply the distance around the figure.

Hence, the perimeter of the triangle is the sum of all its 3 side lengths.

From the diagram:

Side length 1 = ( d² + 3 )

Side length 2 = ( 4d² + 3d - 2 )

Side length 3 = ( -2d² - 7d )

Hence, the perimeter of the triangle will be:

Perimeter = side length 1 + side length 2 + side length 3

Plug in the expressions

Perimeter = ( d² + 3 ) + ( 4d² + 3d - 2 ) + ( -2d² - 7d )

Collect and add like terms:

Perimeter = d² + 3 + 4d² + 3d - 2 + -2d² - 7d

Perimeter = d² + 4d² - 2d² + 3d - 7d + 3 - 2

Perimeter = 3d² - 4d + 1

Therefore, the perimeter is 3d² - 4d + 1.

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Answer:

1/(x^2-6x+8)

Step-by-step explanation:

1. x^2-16=(x-4)*(x+4)

2. x^2+5x+6=(x+2)*(x+3)

So (x+4)/(x^2+5*x+6) *(x+3)/(x^2-16)=

=(x+4)*(x+3)/((x+4)(x-4)(x+2)(x+3))=1/((x-4)(x-2))=1/(x^2-6x+8)

Answer:

2x^7

Step-by-step explanation:

add the exponents because they both are x

2x^4*x^3=2x^7

The algebraic expression that represents the total cost would be: A. 1.25r.

Given that the number of donuts Rick buys for his family is represented by letter "r", and we also know that:

cost of each donut = $1.25.

Using an algebraic expression, we can create a mathematical expression that shows the total cost for Rick to by a given number of donuts for his family.

Thus:

1 donut = 1.25

r donuts would cost: 1.25 × r = 1.25r.

Therefore, the algebraic expression that represents the total cost would be: A. 1.25r.

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The pair that support Angle-Side-Angle Postulate (ASA) be used to prove that △ABC≅△XYZ is option B

Triangles are said to be congruent when the sides and angles equal in accordance to to the triangle congruency rules

examples of these rules are

The problem requires the prove by Angle - Side- Angle = ASA to ensure that the the triangles are congruent

The Angle - Side - Angle = ASA have it that the two triangles being compared should have their two angles and the included side being equal

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Answer:

9.22

I really hope it helps

let me know am i right to be shure

Answer:

\(9.22\)

Step-by-step explanation:

You would need to use the distance formula to find the approximate distance between points A and B.

\(distance=\sqrt{(x_{2}-x_{1})^{2} +(y_{2}-y_{1})^2}\)

\(\sqrt{((-2)-4)^{2} +((-4)-3)^2}\)

\(\sqrt{(-6)^{2} +(-7)^2}\\\)

\(\sqrt{36 +49}\)

\(\sqrt{85}\)

\(\sqrt{85}=9.219544457=9.22\)

Therefore, the approximate distance between points A and B is 9.22.

Answer:

y=-3x-6

Step-by-step explanation:

go down 3

over 1

rise over run 3/1

it's already on -6

The z-value obtained from the test was 2.25, and the p-value was less than 0.02.

What is probability ?

Probability can be defined as ratio of number of favourable outcomes and total number of outcomes.

Based on the experiment described, a two-sample z-test for the difference in proportions was conducted to determine if there is a significant difference between the proportion of rats that succeeded in the maze after being given substance m and the proportion of rats in the control group that succeeded in the maze.

This suggests that the difference in proportions between the two groups is statistically significant at the 0.05 level of significance (since the p-value is less than 0.05).

In other words, the results of the experiment suggest that substance m may be effective in helping to restore memory, as a greater proportion of rats in the substance m group succeeded in the maze compared to the control group. However, it's important to note that further experiments and analyses would be necessary to confirm these findings and determine the extent of the effect of substance m on memory restoration.

Therefore, The z-value obtained from the test was 2.25, and the p-value was less than 0.02.

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Answer:

Step-by-step explanation:

You haven't provide expressions to choose from.

6(c+8) = 6c+48

Answer:

6c + 48

Step-by-step explanation:

The the vertices of reflected square, Q'R'S'T are Q' = (3, 1), R' = (-8, -2), S' = (-7, -7) and T' = (-2, -6)

A reflection is a mirror image of the shape. An image will reflect through a line, known as the line of reflection. A figure is said to reflect the other figure, and then every point in a figure is equidistant from each corresponding point in another figure.

Given that, a square QRST with vertices Q(-3, 1), R(8, -2), S(7, -7) and T(2, -6)

is reflected across y-axis, to form Q'R'S'T we need to find the vertices of reflected square.

We know that, rule of reflection over y-axis,

(x, y) → (-x, y)

Q' = (3, 1)

R' = (-8, -2)

S' = (-7, -7)

T' = (-2, -6)

Hence, the the vertices of reflected square, Q'R'S'T are Q' = (3, 1), R' = (-8, -2), S' = (-7, -7) and T' = (-2, -6)

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Answer:60, 6.75

Step-by-step explanation:

To solve the first prompt, we must create an equality statement.

\(\frac{10}{45}=\frac{x}{270}\) X being the distance he can go in 4.5 hours.

In order to have came up with 270, we needed to take 4.5 hours and turn it into a measure of minutes to correspond to the minute value of 45.

This is found by multiplying 4.5 by 60.

Now that we have this done, we can cross multiply the equality statement.

\(10\cdot270=45x\)

Simplify the first side

\(2700=45x\)

Divide both sides by 45

\(\frac{2700}{45}=\frac{45x}{45}\)

\(60=x\)

This means that Jacob can bike 60 miles in 4.5 hours.

For the second prompt, we need to find how long it would take for him to bike 90 miles given the amount of time it took for him to bike 10 miles.

We can use an equality statement like this:

\(\frac{45}{10}=\frac{x}{90}\)

Now we cross multiply:

\(45\cdot90=10\cdot x\)

Simplify:

\(4050=10x\)

Now we can divide both sides by 10.

\(\frac{4050}{10}=\frac{10x}{10}\)

\(405=x\)

This means that it would take Jacob 405 MINUTES to bike 90 miles.

To turn this into a measure of hours, we need to divide 405 by 60, which comes out to 6.75.

It would take Jacob 6.75 hours to bike 90 miles.

To solve for x in the equation 4x3 = -5x - 21, we can follow these steps:

1. Move all the terms containing x to one side of the equation, and move the constant term to the other side. We can do this by adding 5x to both sides and then adding 21 to both sides:

   4x3 + 5x = -21

2. Factor out x from the left-hand side of the equation:

   x(4x2 + 5) = -21

3. Divide both sides by (4x2 + 5):

   x = -21 / (4x2 + 5)

So the solution for x is x = -21 / (4x2 + 5). Note that this is a rational function, which means that the value of x depends on the value of the variable x. This equation has no real solutions because the denominator is always positive, and the numerator is negative.

Step-by-step explanation:

The expression in factored form is 5(q-20)(q-80).

The numbers 20 and 80 represent the values of q that make the expression equal to zero.

Setting the expression equal to zero, we get:

5(q-20)(q-80) = 0

This means that either (q-20) = 0 or (q-80) = 0, since the product of two factors is zero if and only if at least one of the factors is zero.

Solving for q in each case, we get:

q-20 = 0 -> q = 20

q-80 = 0 -> q = 80

Therefore, the numbers 20 and 80 represent the values of q that make the profit equal to zero (i.e., the break-even points). If Games 'n' Mods builds and sells fewer than 20 or more than 80 computers, it will operate at a loss. If it builds and sells between 20 and 80 computers, it will make a profit.

To draw a conclusion, a statistical analysis with a significance level (alpha) of 0.02 can be applied to compare the results.treated samples consistently show lower shrinkage temperatures compared to the control samples

In this study, the aim is to prove that electrical stimulation improves meat tenderness. Connective tissue (collagen) from beef steaks was examined, as lower collagen shrinkage temperature indicates higher tenderness.

The beef carcasses were split, with one side subjected to electrical current and the other side untreated as a control. Steak samples were cut from each side and tested for tenderness by determining the collagen shrinkage temperature.

I, it suggests that electrical stimulation does improve meat tenderness.

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Step-by-step explanation:

yes, the step is correct.

a² = cx | multiply by c

ca² = c²x

I am just not sure how that simplified the equation.

what do you want to achieve ? what's the goal here ?

to solve the equation for x it would be to divide both sides by c, which gives

a²/c = x

Answer:

x< -12

Step-by-step explanation:

-1/2x>6
x-2.   x-2

x>-12

Since we multiply by we negative we flip the sign

x< -12

Hopes this helps

The area of the shaded region

=

Answer:

0.235

Step-by-step explanation:

Define S as

S = the event that a randomly selected adult in the U.S. approves of President Trump.

Define ~S as the negation of S, i.e.,

~S = the event that a randomly selected adult in the U.S. does not approve of President Trump

Then,

P(S) = 40% = 0.4

P(~S) = 1 - 0.4 = 0.6

35% of 50 = 0.35 * 50 = 17.5.

We want to compute:

P(a random selection of 50 adults has less than 17.5 of them approving of President Trump) =

P(17 of the 50 approve) + P(16 of the 50 approve) + P(15 of the 50 approve) + . . . + P(none of the 50 approve).  

We approximately compute this by approximating the summation (which is from a binomial distribution) by a normal distribution with

mean = 0.4(50) = 20,

and

standard deviation = sqrt( .4 * .6 * 50) = sqrt( 12 ) = 3.464 rounded to the nearest 1000th.  

So, for normal random variable X with mean = 20 and std = 3.464, the probability that we want is approximately equal to P(X < 17.5), where we note that X is a real random variable.  

So, the Z value = (17.5 - 20)/3.464 = -0.722, rounded to the nearest 1000th.  

Using the normal random variable online calculator, https://stattrek.com/online-calculator/normal.aspx,

we get that

P(z < -0.722) = 0.235, which is the answer to the question.  

y≤−5x−10 and y>x+2 The shaded region satisfies both inequalities and represents the solution to the system of linear inequalities.

To graphically solve this system of linear inequalities, we can start by graphing each inequality on the same coordinate system:

First, let's graph the inequality y ≤ -5x - 10. We can start by graphing the line y = -5x - 10, which is the boundary line of the inequality. We can plot two points on this line, say (-2,0) and (0,-10), and draw a straight line passing through them.

Next, we need to determine which side of the line satisfies the inequality y ≤ -5x - 10. We can choose any point on one side of the line, say (0,0), and test it in the inequality. If y ≤ -5x - 10 is true for (0,0), then that side of the line satisfies the inequality. Otherwise, the other side satisfies the inequality. Testing (0,0), we have:

0 ≤ -5(0) - 10

0 ≤ -10

This is false, so the side of the line containing the origin does not satisfy the inequality. The other side of the line does.

Now, let's graph the inequality y > x + 2. We can start by graphing the line y = x + 2, which is the boundary line of the inequality. We can plot two points on this line, say (-2,0) and (0,2), and draw a straight line passing through them.

Next, we need to determine which side of the line satisfies the inequality y > x + 2. We can choose any point on one side of the line, say (0,0), and test it in the inequality. If y > x + 2 is true for (0,0), then that side of the line satisfies the inequality. Otherwise, the other side satisfies the inequality. Testing (0,0), we have:

0 > 0 + 2

This is false, so the side of the line containing the origin does not satisfy the inequality. The other side of the line does.

Now, we can shade the region that satisfies both inequalities. The shaded region is the region that is below the line y = -5x - 10 (including the line itself) and above the line y = x + 2 (excluding the line itself).

The shaded region is shown below:

Graph of y≤−5x−10 and y>x+2

The shaded region satisfies both inequalities and represents the solution to the system of linear inequalities.

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Answer:

\(x+8=7*10\)

Step-by-step explanation:

Sum of X and 8: \(x+8\)

Product of seven and 10: \(7*10\)

Put them together:

\(x+8=7*10\)

It would be 3 miles.

The value of n is 108°

The value of m is 36°

A quadrilateral is a plane figure that has four sides or edges, and also has four corners or vertices. The angles are present at the four vertices or corners of the quadrilateral.

It is formed by joining four non-collinear points. The sum of interior angles of quadrilaterals is always equal to 360 degrees.

How to find the angles.

We can find the value of n using the principle

72° + n = 180°

Collect like terms

n = 180° - 72°

n = 108°

Knowing that the sum of the angles n and angles 2m is equal to 180°, this will give us

2m + 108 = 180°

We collect like terms from here.

2m = 180° - 108

2m = 72°

m = 72/2

m = 36°

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There is exactly one real solution to the equation. Option B.

To determine the number of real solutions for the equation √(2x + 4) = 1/(2x + 1), we can start by setting up the equation and solving it.

√(2x + 4) = 1/(2x + 1)

To eliminate the square root, we can square both sides of the equation:

(√(2x + 4))^2 = (1/(2x + 1))^2

2x + 4 = 1/(2x + 1)^2

Now we can cross-multiply to get rid of the fraction:

(2x + 4)(2x + 1)^2 = 1

Expanding and simplifying:

4x^3 + 12x^2 + 10x + 4 = 1

4x^3 + 12x^2 + 10x + 3 = 0

Now, we have a cubic equation. To determine the number of real solutions, we can analyze the equation or plot its graph. However, it is not immediately clear from the equation alone how many real solutions there are.

To obtain a more precise answer, we can use numerical methods or graphing technology to analyze the equation. By plotting the graph of the equation or using numerical methods such as Newton's method or the bisection method, we can find that there is exactly one real solution to the equation. Option B is correct.

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