2. In 1980 there were 900 residents of Sillycity. The
number of residents increases by 60% every year. Write
an exponential growth function to model this situation.
a)
Y = 900 (1.60)
b) y=900 (1 +60)*
c) y = 900 (.40)
d) y = 900 (1 - 60)

i believe the answer is letter c) 8

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional