Question

A coral reef is located near to a chemical plant. Scientists measure the number of colonies of coral over a period of 20 years. Each year, the

number of colonies is 5 times the previous year.


Which equation shows the number of colonies, c after t years?

c=5-25²
c=25-3²
c=25-5²
c=25+3t
c=25-20¹

SCALE:
0 - 1 - 2 - n
25-125-625-n


Find out which equation best suits N on the scale.

Answer 1

c = 25 * 5^t

Explanation:

c = 25 * 5^t

This equation best suits N on the scale as it follows the pattern of the number of colonies being 5 times the previous year.