Suppose that an automobile's velocity starting from rest is v(t) = lecimal place. O 3.3 ft/sec2 O 2.6 ft/sec² O 0.9 ft/sec² O 0.7 ft/sec² O 13.1 ft/sec² Question 9 280t 5t+15 where v is measured in feet per second. Find the acceleration at 5 seconds. Round your answe Find the open interval(s) on which f(x) = -5x² +50x+8 is increasing or decreasing.

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