21) the exponentia
exponential function y = 2(3) grows by a factor of 9 between x = 1 and x = 3. what
factor does it grow by between x=5 and x=7
a) 3
b) 6
99
d) 18

C.  9.

Step-by-step explanation:

I think you mean y = 2(3)^x.

When x = 1, y = 6 and when x = 3, y = 54 so that is a factor of 6.

When x = 5, y = 2(3)^5 = 486

when x = 7, y = 2(3)^7 = 4374

The factor id 4374/486 = 9.

do you have the measurements?