Find the slope and y-intercept of the graph of the equation y=1/2x+7

Ineed with 14, 16, 28 and 36 me. we didn't go over them in class so i don't know what to do.

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?

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319