Please help with questions 1 and 2
Thank you

1a)

y = 85 * 1.09 ^ x

(^ = 'to the power of')

2a)

y = 100 * 0.87 ^ x

0.87 is 13% less than 1 (or 100%)

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).