Unit Test — Unit test Answers
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When a baseball is hit by a batter, the height of the ball, h(t), at time t, , is determined by the equation . If t is in seconds, for which interval of time is the height of the ball greater than or equal to 52 feet?
A
Option
B
Option
C
Option
D
Option
22
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Use the zero product property to find the solutions to the equation 6x2 – 5x = 56.
A
x = –8 or x =
B
x = or x =
C
x = or x =
D
x = or x =
23
A projectile is fired straight up from ground level with an initial velocity of 112 ft/s. Its height, h, above the ground after t seconds is given by h = –16t2 + 112t. What is the interval of time during which the projectile's height exceeds 192 feet?
A
3 < t < 4B
t < 4C
t > 4D
3 > t > 424
Which equation is the inverse of y = 9x2 – 4?
A
y = StartFraction plus-or-minus StartRoot x + 4 EndRoot Over 9 EndFraction
B
y = plus-or-minus StartRoot StartFraction x Over 9 EndFraction + 4 EndRoot
C
y = StartFraction plus-or-minus StartRoot x + 4 EndRoot Over 3 EndFraction
D
y = StartFraction plus-or-minus StartRoot x EndRoot Over 3 EndFraction + two-thirds
25
For what values of m does the graph of y = 3x2 + 7x + m have two x-intercepts?
A
m greater-than StartFraction 25 Over 3 EndFraction
B
m less-than StartFraction 25 Over 3 EndFraction
C
m less-than StartFraction 49 Over 12 EndFraction
D
m greater-than StartFraction 49 Over 12 EndFraction
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