Help and look at the picture!

The answer is the second one 8×107

8*10^7

Step-by-step explanation:

Multiply 2 and 4 to get 8

Add the exponents and u get 7

Therefore 8*10^7

b

step-by-step explanation:

ez

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6