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3 years ago

Please help! 5/20, will give brainliest. I do not tolerate spam answers!

Mathematics

2 answers:

Angelina_Jolie [31]3 years ago

4 0

Answer:

9(x - 3)(x + 3)

Step-by-step explanation:

Given

9x² - 81 ← factor out 9 from each term

= 9(x² - 9) ← x² - 9 is a difference of squares

= 9(x - 3)(x + 3) ← in factored form

notka56 [123]3 years ago

3 0

This one can be factored.

$9x^2-81=9(x^2-9)$

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2. A science teacher has 4 2/3 packages of bird

Fittoniya [83]

Answer:

10.5 or 10 1/2

Step-by-step explanation:

You would do 4 2/3 times 2 1/4.Which would equal 10.5 or 10 1/2

4 0

4 years ago

a circle with radius of 2cm sits inside a 7cm x 11cm rectangle. what is the area of the shaded region ?

Agata [3.3K]

Answer:

The area of the shaded region is $(77-4\pi)\ cm^{2}$

Step-by-step explanation:

we know that

The area of the shaded region is equal to the area of the rectangle minus the area of the circle

step 1

Find the area of the rectangle

$A=(7)(11)=77\ cm^{2}$

step 2

Fin the area of the circle

$A=\pi (2)^{2}=4\pi \ cm^{2}$

step 3

Find the area of the shaded region

$77\ cm^{2}-4\pi \ cm^{2}=(77-4\pi)\ cm^{2}$ -----> exact value

To find the approximate value use $\pi=3.14$

$(77-4(3.14))=64.44\ cm^{2}$ -----> approximate value

7 0

3 years ago

A line connecting the points (-3,0) and (x, -6)has slope -1. Determine x.

ankoles [38]

Answer:

x=3

Step-by-step explanation:

We can use the slope formula to help complete this question

m = (y2-y1)/(x2-x1)

-1 = ( -6-0)/(x- -3)

-1 = -6/ (x+3)

Multiply each side by (x+3)

-x-3 = -6

Add 3 to each side

-x -3+3 = -6+3

-x =-3

Multiply each side by -1

x = 3

5 0

2 years ago

Read 2 more answers

GIVING BRAINIEST EXPLAIN ANSWER

Neporo4naja [7]

Answer: B. -0.5 blocks per minute

Step-by-step explanation: It goes up 2 on the x column and down 1 (-1) on the y column. So it would be -1/2 = -0.5.

8 0

3 years ago

Read 2 more answers

PLEASE HELP! 25 PTS!!

zubka84 [21]

Answer:

Solution given:

$f(x)=\frac{x-16}{x^2+6x-40}$

$g(x)=\frac{1}{x+10}$

now

f(x)+g(x)= $\frac{x-16}{x^2+6x-40}+\frac{1}{x+10}$ ....(1)

now

factoring x²+6x-40

we get

x²+10x-4x-40

x(x+10)-4(x+10)

(x+10)(x-4)

now substituting in equation 1 ,we get

f(x)+g(x)= $\frac{x-16}{(x+10)(x-4)}+\frac{1}{x+10}$

taking l.c.m

= $\frac{(x-16)+(x-4)}{(x-10)(x-4)}$

=now

opening bracket

$\frac{x-16+x-4}{x²-10x-4x+40}$

= $\frac{2x-20}{x²+6x-40}$

answer is :

B. $\bold b\frac{2x-20}{x^2+6x-40}$

6 0

3 years ago