At the bookstore, 40 copies of a popular paperback book fit perfectly on a 5-foot shelf. how many copies of this book would fit perfectly on an 8-foot shelf?

How do you do this geometry 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.

What term makes it inconsistent y=2x - 4 ?