Solve the problem.A ball is projected upward from ground level. After t seconds, its height in feet is a function defined by 
After how many seconds will it reach a height of 192 ft?
A. 3.5 sec and 4.5 sec
B. 3 sec
C. The ball never reaches a height of 192 feet.
D. 3 sec and 4 sec
Answer: D
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Add. Do not use a number line except as a check.- 
+ 
A. - 
B. 
C. - 
D. 
Find the unit rate.In a region, the total number of students enrolled in public schools in a recent year was 422,265. At the same time, there were 24,368 public school teachers. Write a unit rate in students per teacher. Round to the nearest whole.
A. 16 students/teacher B. 19 students/teacher C. 17 students/teacher D. 18 students/teacher
Solve the problem.Consider the quadratic model h(t) = -16t2 + 40t + 50 for the height (in feet), h, of an object t seconds after the object has been projected straight up into the air. Find the maximum height attained by the object. How much time does it take to fall back to the ground? Assume that it takes the same time for going up and coming down.
A. maximum height = 75 ft; time to reach ground = 2.5 seconds B. maximum height = 50 ft; time to reach ground = 2.5 seconds C. maximum height = 75 ft; time to reach ground = 1.25 seconds D. maximum height = 50 ft; time to reach ground = 1.25 seconds
List the critical values of the related function. Then solve the inequality.
+ 
? 
A. -5 - 
, -4, -5 + 
, 1, 4; [-5 - 
, -4) ? [-5 + 
, 1) ? (4, ?)
B. -4 - 
, -5, -4 + 
, 1, 5; [-4 - 
, -5) ? [-4 + 
, 1) ? (5, ?)
C. No critical values; ?
D. -5 - 
, -4, -5 + 
, 1, 4; [-5 - 
, -4) ? [-5 + 
, 1) ? (4, ?)