Please help me who understands this

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

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?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.