What is 3/8 in simplest form

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

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?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.