Fannie has a credit card that uses the average daily balance method. For the first 16 days of one of her billing cycles, her balance was $1050, and for the last 14 days of the billing cycle, her balance was $1280. If her credit card's APR is 19%, which of these expressions could be used to calculate the amount Fannie was charged in interest for the billing cycle?

2

step-by-2step explanation:

a

step-by-step explanation:

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is