Question

1.

A bacteria sample is growing exponentially, as a seen in the table below.
Which exponential regression equation best represents this data? (Round values to the nearest tenth.)
a) y=22.3(1.4)^x
b) y=20.5(1.9)^x
c) y=15.1(0.8)^x
d) y=32.6(1.6)^x

Answer 1

• b) y=20.5(1.9)^x

Explanation:

As per data in the table:

• The initial number is 20
• The growth rate is about twice

This is best matching the function:

• y = 20.5(1.9)^x

option b)