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).
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Answer:
(a) positive and increasing
Step-by-step explanation:
Point c is on the x-axis, and point d is above it. The curve between points c and d is positive and increasing.
Answer:
ABD ~= CBE
Step-by-step explanation:

x = how high the kite is
x = 24 × tan(58)
x is approximately 38 meters
Set up a proportion and cross multiply.