Question

On average, a commercial airplane burns about 3.9 × 10³ ml of gasoline per second. there can be as many as 5.1 × 10³ airplanes in the air in the united states at any given time. About how many milliliters of gasoline are burned per minute by commercial airplanes in flight in the united states?
Answer: 1.2 x 10^___ mL
This is scientific notaion

Answer 1

milliliters of gasoline=gasoline consumption x number of airplanes.
milliliters of gasoline=(3.9 * 10³)(5.1*10³)=(3.9*5.1)(10³⁺³)=19.89*10⁶=
=1.989*10⁷ ml
Remember: 1 minute=60 seconds;
Therefore:

1.989*10⁷ ml-------------------1 s
x-------------------------------60 s

x=(1.989*10⁷ml * 60 s)/1s≈1.2*10⁹

Answer: 1.2*10⁹ ml