Which graph shows a linear function?

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

The depreciation per unit for a company

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?