Tennis balls are filled with nitrogen gas. 1.7% of nitrogen gas has escaped from a particular ball after 10 hits.

a) how much gas is left after a game that had 23 hits on the ball?

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

Asap! i'm not good math and i'm lost.