The average rate of change of a function f(x) = x2 between x = 3 and x = 9 is
1 answer:
Answer:
12.
Step-by-step explanation:
Average rate of change = (value of the function when x = 9 - value when x=3)
/
(9 - 3)
= f(9) - f(3) / (9-3)
= (9^2 - 3^2) / (9-3)
= 72 / 6
= 12.
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For each child she spent $5 plus $15 = $20
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