Answer:
620.14
Step-by-step explanation:
Original Equation:

Calculate exponents

Simplify:

Add like terms

Divide both sides by 7.012


Answer:
57 mph
Step-by-step explanation:
were tryin to find its speed in the terms of mph which is miles per hour, so we need to find out how many miles it goes in a hour, so we divide 399 mph by 7 hours to get 57 mph.
Answer:
B
Step-by-step explanation:
The second one!!!