Kenisha uses the fermi process to estimate the number of dollar bills that would cover her driveway. her driveway is rectangular in shape.

she estimates a dollar bill to be about 6 in. long and 3 in. wide.
she estimates her driveway to be about 30 ft long and 20 ft wide.
which expression should kenisha use in the process?

9×10^4/2×10^2

6×10^2/2×10^1

6×10^2/2×10^2

9×10^4/2×10^1

option A

9×10^4/2×10^2

Step-by-step explanation:

Given in the question,

length of dollar bill = 6

width of dollar bill = 3

area of dollar bill = L x W

                            = 6 x 3

                            = 18inches²

length of driveway = 30

width of driveway = 20

area of driveway = L x W

                             = 30 x 20

                             = 600 ft²

1 ft² = 144 inches²

600 ft² = 86400 inches²

Number of dollar bills that would cover Kenisha driveway = 86400 / 18

Which can also be written as

86400 = 9 x 10

18        = 2 x 10²

it is 10.6 according to my calculations