This is the graph for the function
X intercept : (5,0),(-3,0)
y intercept : (0,-15)
vertex: (1,-16)
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Step-by-step explanation:

Kylie's first month collection, a1= $ 145
Second month collection , a2= $145+ 20
Third month collection, a3 = $145 +2*20
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so for n months collection = an-1+20
We get an= 20 + an-1 and a1=145