How do i solve 7x to the power of 2 plus2x when x=3?

These question are hard can you me with answers

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.

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?