Peter buys 8.5 square feet of carpet. the carpet costs $10.20 per square foot. how much does peter pay for the carpet?

Can someone explain the elimination method to me for this problem?

The level of co2 emissions, f(x), in metric tons, from the town of fairfax x years after they started recording is shown in the table below. x 2 4 6 8 10 f(x) 26,460 29,172.15 32,162.29 35,458.93 39,093.47 select the true statement.

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls