Solve the problem.The intensity of a certain noise is 1.28 × 10-8 W/cm2. How loud, in decibels, is this sound level? Use the formula 
where 
(Round to the nearest decibel.)
A. -21 decibels
B. 34 decibels
C. 82 decibels
D. 81 decibels
Answer: D
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Which of the following is the sample set for an experiment which involves tossing three coins?
A. HHH, TTT B. HHH, HHT, HTT, TTT C. HHH, HHT, HTH, THH, TTT D. HHH, HHT, HTH, THH, TTH, THT, HTT, TTT
Solve the problem. Assume projectile is ideal, launch angle is measured from the horizontal, and launch is over a horizontal surface, unless stated otherwise.A baseball is hit when it is 3.4 ft above the ground. It leaves the bat with an initial velocity of 
at a launch angle of 23°. At the instant the ball is hit, an instantaneous gust of wind blows against the ball, adding a component of -13.5i (ft/sec) to the ball's initial velocity. How high does the baseball go? Round your answer to the nearest tenth.
A. 54.7 ft B. 46.8 ft C. 50.2 ft D. 52.2 ft
Insert ? or ? in the blank to make the statement is true.? 
?
A. ? B. ?
Solve the equation.(6x + 7)(36x2 + 84x + 49) = 0
A. - 
, 6, -7
B. - 
, 0
C. - 
, 6, -7, 0
D. - 