A tennis ball is hit upward with a velocity of 48 feet per second. Use h(x) = -16x2 + 48x + 400 where h(t) is the height of the ball after x seconds. Ignoring the height of the tennis player,
21. How long does it take the ball to hit the ground?
a. 1.5 sec
b. 8 sec
c. 6.72 sec
d. 436 sec
22. What is the maximum height reached by the ball? a. 1.5 ft
b. 8 ft
c. 6.72 ft
d. 436 ft
23. At what time does the ball reach the maximum height?
a. 1.5 sec
b. 8 ft
C. 6.72 ft
d. 436 ft
OCT
21

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

33 ! use the following data to determine the type of function (linear, quadratic, exponential) that best fits the data set. (1, 2) (5, 7) (9, 8) (3, 4) (4, 5) (2, 3)