Which expression is equivalent to 20x−8y 1. 2(10x+4y)

2. 4(5x−8y)

3. 4(5x−2y)

4. x(20−8y)

1.

Step-by-step explanation:

We are trying to find out what is equal to 2(10x+4y)

2(10x+4y)

because 2 times 10x is 20x,  4y times 2 is 8y!

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80