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Dafna11 [192]
2 years ago
7

4a/5 (10a-25b) pls help me !ill give brainlist

Mathematics
1 answer:
WITCHER [35]2 years ago
5 0

Answer:

8a² - 20ab

Step-by-step explanation:

4a/5 (10a - 25b)

8a² - 20ab

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What is -a^-2 if a=-5
Leviafan [203]
-a^{-2}=-(-5)^{-2}=-\left(\dfrac{1}{-5}\right)^2=-\dfrac{1}{25}
3 0
3 years ago
The sides of a rectangle have length x+ 2 and width x -5. Which equation describes the area, A, of the rectangle in terms of x?​
Yakvenalex [24]

Answer:

The area in factored form is A=(x+2)(x-5).

The area in standard form is A=x^2-3x-10.

Step-by-step explanation:

The area of a rectangle is length times width.

So the area here is (x+2)(x-5).

They are probably not looking for A=(x+2)(x-5) because it requires too little work.

They probably want A in standard form instead of factored form.

Let's use foil:

First x(x)=x^2

Outer: x(-5)=-5x

Inner: 2(x)=2x

Last: 2(-5)=-10

---------------------Adding together:  x^2-3x-10.

The area in factored form is A=(x+2)(x-5).

The area in standard form is A=x^2-3x-10.

4 0
2 years ago
Please hurry lol
agasfer [191]

Answer:

what grade are u

Step-by-step explanation:

so that I c could definetly answer it

3 0
3 years ago
The sum of the present ages of the mother and her daughter is 80 years. The mother was thrice as old as her daughter when she wa
Alika [10]

Answer:

let the daughter age be x

let mother age be 3x

Step-by-step explanation:

x+3x= 80

4x = 80

x= 80\4

x=20

daughter age is 20

mather age= 80 -20

= 60

daughter age 20

mother age 60

7 0
2 years ago
Please do all of them correct and quick I will mark brainliest and 10 points ty pls I’m on a time limit
sweet-ann [11.9K]

1: 9pi

2. 18

3. 12pi

4. 672

5. 23.94

6. 10 3/4

7 0
2 years ago
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