Is 56 ft, 65 ft, 16 ft a right triangle

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Which number completes the inequality? 2/3 < _ < 7/9

Someone me! if you’re smart you can solve this!