Don't know need help [pls

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Acircle has a circumference of 28.36 units what is the diameter of the circle

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?