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3 years ago

Factor this polynomial completely. x2 - 81

Mathematics

1 answer:

Naddik [55]3 years ago

6 0

The first answer is right
(x - 9) (x + 9)
It’s me again lol

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Volume of a box is 125 in.³ how tall is the box ?

lora16 [44]

Answer:

i dont know much detail about this question but it could be 1. simplest answer

Step-by-step explanation:

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3 years ago

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Dena borrowed $75,000 to buy a used car. The credit union charged 9% simple interest per year. She paid $2,025 in interest. For

kondaur [170]

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3 years ago

which of these shows the result of using the first equation to substitute for y in the second equation, then combining like term

Furkat [3]

Answer:

C. $\Rightarrow \bold{8x = 16}$

Step-by-step explanation:

Given the two equations:

$y=2x ........ (1)\\ 2x+3y=16.......(2)$

To find:

The correct option when value of y is substituted to 2nd equation using the 1st equation.

Solution:

First of all, let us learn about the substitution method.

Substitution method is the method to provide solutions to two variables when we have two equations and two variables.

In substitution method, we find the value of one variable in terms of the other variable and put this value in the other equation.

Now, the other equation becomes only single variable and then we solve for the variable's value.

Here, we have two equations and value of one varible is:

$y=2x$

Let us put value of y in 2nd equation:

$2x+3y=16\\\Rightarrow 2x + 3(2x) = 16\\\Rightarrow 2x + 6x = 16\\\Rightarrow \bold{8x=16}$

So, the correct answer is option C. $\Rightarrow \bold{8x = 16}$

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3 years ago

The angle of inclination from the base of skyscraper A to the top of skyscraper B is approximately 13.713.7degrees°. If skyscrap

Norma-Jean [14]

Answer:

5956 ft

Step-by-step explanation:

If we designate the points at the bases of the skyscrapers as A and B, and the top of skyscraper B as point T, then triangle ABT is a right triangle with angle B = 90° and angle A = 13.7°.

The definition of the tangent function tells us ...

tan(A) = BT/AB

Solving for AB, we find ...

AB = BT/tan(A) = (1452 ft)/tan(13.7°)

AB ≈ 5956 ft

The skyscrapers are about 5956 feet apart.

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3 years ago

Koji is installing a rectangular window in an office building. The window is 8 2/3 ft The formula for the area of a rectangle is

larisa86 [58]

It's 5 because the fraction when you divide. 23.

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3 years ago