13) Cody’s credit card company uses the unpaid-balance method and charges a monthly periodic rate of 1.8%. His finance charge was $17.54, he made $376.90 in new purchases, and a $250.00 payment. Find (a) his unpaid balance, (b) previous balance, and (c) new balance.

show da graph

step-by-step explanation:

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)