Question

estimation a group of students go out on a boat to go scuba diving. the instructor takes the group 47 feet below the surface to start. then they go up 30.78 feet and stop to see some fish. estimate the total change in distance from where they started at the surface. find the total change in distance from where they started at the surface. which of the following is the best estimate for the total change in distance from the group of students original position at the surface? round to the nearest ten. a. - 50 feet b. - 80 feet c. - 20 feet d. - 30 feet

Explanation:

Step1: Define downward as negative and upward as positive

Let the initial descent of 47 feet be - 47 (negative because it is downward), and the upward movement of 30.78 feet be + 30.78.

Step2: Calculate the total change in distance

The total change in distance $d$ is $d=-47 + 30.78=-16.22$.

Step3: Round to the nearest ten

Rounding - 16.22 to the nearest ten gives - 20.

Answer:

C. - 20 feet