The function h determines the height of ball (in feet) above the top of a buildi

Question

The function h determines the height of ball (in feet) above the top of a building in terms of the number of seconds, t, since the ball was thrown upward from the top of the building. The ball rose upward and then fell to the ground. The ball passed the top of the building on its way down 2.8 seconds after it was thrown. It hit the ground 3.2 seconds after it was thrown. Which of the following represents a height above the top of the building that is 10 feet more than the ball's height above the top of the building 3 seconds since the ball was thrown? a. -h(t - 3) + 10 b. h(t + 3) + 10 c. -h(3) + 10 d. h(3) + 10 e. h(3 + 10) A gallon of paint covers 250 square feet of wall. A gallon of paint costs $30.50. Which of the following expressions represents the number of gallons of paint needed to paint n square feet of wall? a. 250n b. 30.50 n c. 250/n d. n/250 e. 30.5n/250

Explanation / Answer

h(t) becomes h(t + 3)

h(t + 3) + 10

If this does not work, plz try -h(t - 3) + 10

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a gallon covers 250 sq ft
A gallon costs $30.50

Say x gallons...

250 sq ft is covered with 1 gallon
n sq ft is covered with x gallons

250*x = 1*n

So, we have :

x = n/250

Option D

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