A company's revenue R from selling x items can be modeled by the equation R = -2x2 + 120x - 100. How many items must they sell to maximize their revenue?
Quadratic Function Word Problems

Quiz
•
Mathematics
•
9th Grade
•
Hard
Anthony Clark
FREE Resource
18 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
15 items
30 items
60 items
120 items
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Rafael drops a ball from a third-story window. This equation represents the approximate height, h, in meters, of the ball above the ground after it falls for t seconds.
h = -5t2 + 45
When is the ball at ground level?
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If you square 5 more than a positive number, the result is 88 more than 12 times the number. Find the numbers.
-9 and 7
9 and -7
15 and -5
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Your nephew is standing on his deck, which is 4 feet off the ground. He tosses his toy up into the air. The equation h = -2t2 + 7t + 4 models the toy's height, h, from the ground at t seconds after he threw it. How high is the toy after 1 second?
5.
FILL IN THE BLANK QUESTION
1 min • 1 pt
The height, y, of a ball tossed into the air can be represented by the equation
y = −x2 + 10x + 3, where x is the elapsed time. What is the equation of the axis of symmetry of this parabola?
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
If a toy rocket is launched vertically upward from ground level with an initial velocity of 128 feet per second, then its height h after t seconds is given by the equation h(t) = -16t2 +128t When will the object reach its maximum height?
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
A ball is thrown into the air with an upward velocity of 100 ft/s. Its height, h, after t seconds is given by the function
h = -16t2 + 64t + 960.
How many seconds did it take for the ball to reach its maximum height?
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