Answer:
f(x)=0.125x^2+0x+15
Step-by-step explanation:
So, we are given the y intercept, and since we know c is the same as the y value of the y intercept, we know that c=15.
From there we can pick any two of the points given to us to find our a and b.
Let's use (4,17) and (8,23) becase they are whole numbers.
So, with b=0, we can plug it back into the first equation to get:
So our quadratic is
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Answer: after 5 hours, 75 cupcakes
Monthly bill - Flat rate = $38.44 - $3.99 = $34.45.
Minutes used = $34.45 / $0.05 = 689.