Question

Estimating a Product
Looking into the sky one night, Tori wondered how far into outer space she would get if she drove a car for 3.21 × 103 hours at a rate of 70mph. She calculated and determined that a car travelling at 70 mph covers approximately 1.13 × 105 meters per hour.

Tori wrote this expression to determine the distance she would travel into outer space.

(3.21 × 103)(1.13 × 105)

Estimate the distance travelled.
Almost-equals30 × 1015 meters
Almost-equals3 × 108 meters
Almost-equals30 × 108 meters
Almost-equals3 × 1015 meters

Answer 1

Compute (3.21 × 10^3)(1.13 × 10^5) = (3.21·1.13) × 10^(3+5) ≈ 3.63 × 10^8 meters, which rounds to about 3 × 10^8 meters.

So the correct choice is: Almost-equals 3 × 10^8 meters.