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).
9r - 6 = 8r + 3
r = 9
EF = 4r + 19 = 4(9) + 19 = 36 + 19 = 55
hope it helps
Answer:
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Step-by-step explanation:

When y = 0,

When x = 0,

Therefore, Ordered pairs are (0,1), (3,0), etc.