High interest rates make it difficult for people to pay off credit card debt in reasonable period of time. The interest I (in dollars) paid on a $10, 000 debt over 3 years when
the interest rate r% can be approximated by the equation
I
175.393
+ 0.663 = r
If the credit card interest rate is 19.8%, find the amount of interest paid during three years?

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

graph them on a graphing calculator, press 2nd trace. select intersect. hit enter until it says answer. ti 84 works best

step-by-step explanation:

i think the answer would be c