The expression:

gives the distance traveled by the aircraft in t hours, so, for t = 6:
The area of a paralellogram is bh
each dimention is multiplied by n
b turns to bn
h turns to hn
bh turns to (bn)(hn) or bnhn or bhn²
expression is bhnn or bhn² or bhn^2 (depends if the program will let you enter the exponent)
Answer:
10.717
Step-by-step explanation:
15.31×0.7 = 10.717