the average sea level in 1900 at london bridge was 3333 feet. in 1990 it was 33.0833.08 feet. use linear interpolation or extrapolation to find what the average sea level was in 1958.

answer: a.

step-by-step explanation: the answer is a. because, you need to converge the fractions to find a solution.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.