Question

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

Answer 1

Explanation:

Answer 2

option A

9×10^4/2×10^2

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
`^(4)`

18 = 2 x 10²

`(9x10^(4) )/(2x10^(2) )`