4times a number decreased by 6 is less than -2 , define a variable, write an equality and solve for the numbers

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?

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.

Factor the polynomial expression x6 – x3 – 20