Please help its for a test

Factor this polynomial completely x^2-64

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

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?