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determining a quadratic funct
which function has a vertex at (2, -9)?
lo ax) = -(x - 3)2
o f(x) = (x + 8)2
© f(x) = (x - 5)(x + 1)
o f(x) = -(x - 1)(x - 5)

He can use 3 x 5 = 15 and 15 + 3.

Step-by-step explanation:

Since a small car is $3, and the large car is 5x the price of the small car, he can use the equation 3 x 5 = 15, because the small car is $3, and the large car is 5x the price. You can use 15 + 3 = 18, because the small car is $3, so you also have to add that.

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