Municipal Solid Waste Recovered :), på 40 33.3 33.8 34.0 34.7 34.5 30 '08 '09 '10 '11 '12 Year Source: U.S. Environmental Protection Agency. Solve each problem. See Example 7. A 81. Height of a Projectile A projectile is fired straight up from ground level. After t seconds, its height above the ground is s feet, where s = -16t² + 220t. nt bns anoit For what time period is the projectile at least 624 ft above the ground? 82. Height of a Projectile See Exercise 81. For what time period is the projectile at least 744 ft above the ground? 83. Height of a Baseball A baseball is hit so that its height, s, in feet after t seconds is s = -16t2 + 44t + 4. For what time period is the ball at least 32 ft above the ground? 84. Height of a Baseball See Exercise 83. For what time period is the ball greater than 28 ft above the ground? 85. Velocity of an Object Suppose the velocity, v, of an object is given by v = 2t2 – 5t - 12, where t is time in seconds. (Here t can be positive or negative.) Find the interva where the velocity is negative. 86. Velocity of an Object The velocity of an object, v, after t seconds is given by v = 3t2 – 18t + 24. Find the interval where the velocity is negative. 51 er 19 26 20 10 Percent
Municipal Solid Waste Recovered :), på 40 33.3 33.8 34.0 34.7 34.5 30 '08 '09 '10 '11 '12 Year Source: U.S. Environmental Protection Agency. Solve each problem. See Example 7. A 81. Height of a Projectile A projectile is fired straight up from ground level. After t seconds, its height above the ground is s feet, where s = -16t² + 220t. nt bns anoit For what time period is the projectile at least 624 ft above the ground? 82. Height of a Projectile See Exercise 81. For what time period is the projectile at least 744 ft above the ground? 83. Height of a Baseball A baseball is hit so that its height, s, in feet after t seconds is s = -16t2 + 44t + 4. For what time period is the ball at least 32 ft above the ground? 84. Height of a Baseball See Exercise 83. For what time period is the ball greater than 28 ft above the ground? 85. Velocity of an Object Suppose the velocity, v, of an object is given by v = 2t2 – 5t - 12, where t is time in seconds. (Here t can be positive or negative.) Find the interva where the velocity is negative. 86. Velocity of an Object The velocity of an object, v, after t seconds is given by v = 3t2 – 18t + 24. Find the interval where the velocity is negative. 51 er 19 26 20 10 Percent
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter10: Measurement, Area, And Volume
Section10.8: Volumes Of Pyramids And Cones
Problem 12E
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Question
Solve 81 and 82
Transcribed Image Text:Municipal Solid Waste Recovered
:), på
40
33.3
33.8
34.0
34.7
34.5
30
'08
'09
'10
'11
'12
Year
Source: U.S. Environmental Protection Agency.
Solve each problem. See Example 7.
A 81. Height of a Projectile A projectile is fired straight up from ground level. After
t seconds, its height above the ground is s feet, where
s = -16t² + 220t.
nt bns anoit
For what time period is the projectile at least 624 ft above the ground?
82. Height of a Projectile See Exercise 81. For what time period is the projectile at least
744 ft above the ground?
83. Height of a Baseball A baseball is hit so that its height, s, in feet after t seconds is
s = -16t2 + 44t + 4.
For what time period is the ball at least 32 ft above the ground?
84. Height of a Baseball See Exercise 83. For what time period is the ball greater than
28 ft above the ground?
85. Velocity of an Object Suppose the velocity, v, of an object is given by
v = 2t2 – 5t - 12,
where t is time in seconds. (Here t can be positive or negative.) Find the interva
where the velocity is negative.
86. Velocity of an Object The velocity of an object, v, after t seconds is given by
v = 3t2 – 18t + 24.
Find the interval where the velocity is negative.
51
er
19
26
20
10
Percent
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