A rocket is shot straight into the air at an initial velocity of 70 feet/second. The height of the rocket after t seconds is represented by the formula
h = 70t - 5tº. What is the maximum height the rocket reaches?
235 feet
265 feet
215 feet
245 feet

245 feet

Step-by-step explanation:

Given: The height of the rocket after t seconds is represented by the formula:

 [Differentiate both sides w.r.t. t]

Put

Also, i.e. height is maximum at t=7.

Maximum height =

Hence, the maximum height the rocket reaches = 245 feet.

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step-by-step explanatio89

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2