An equation of a function y (t) is shown.
y (t) = - t²+14t-40
Which of the following statements are true about the graph of y (t) for
6≤t≤8 and WHY?
a. The value of y (t) increases over the interval 6≤t≤7
b. The value of y (t) increases over the interval 7≤t≤8
c. The average rate of change over the interval 6≤t≤8 is 0
d. The value of y (t) is constant over the interval 6≤t≤8
e. The average rate of changer over the interval 6≤t≤7 is the same as the average rate of change over the interval 7≤t≤8
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