Pl me  if x varies inversely with y and x = 8 when y = 10, find y when x = 6. y= 4.8 y=40/3 y=7.3 y=3/20

How do you solve a question like this?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62