The x-coord. of the vertex is halfway between the given zeros. Here, it'd be halfway between x=3 and x=9, which comes out to x = 6 (answer).
Answer:
The answer is c: N + 13 = 20
Step-by-step explanation:
The simple interest rate equation is I = Prt
I = interest
P = principle ($54,000)
r = rate (3.875%)
t = time (3 months, so .25 years)
I = Prt
I = (54,000)*(.03875)*(.25)
I = $523.125