Answer:
1.8 × 10^10
Step-by-step explanation:
(7.2 × 10 = 72)
(72) ÷ (4 × 10^-9) = 1.8 × 10^10
100-15=85
85 % of x=19,320
x=19,320 ×100/85≈22729.41
40 km
3.58669999729 I.. I think this is right?