Find the length of the third side. If necessary, round to the nearest tenth 10 20

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10