Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 144 ft/sec, and the gorge is 320 ft deep, during what interval can the flare be seen?(h = -16t2 + v0t + h0.)
A. 0 < t < 4
B. 4 < t < 5
C. 8 < t < 9
D. 12 < t < 13
Answer: B
Mathematics
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Simplify. Combine like terms if possible.8h2 - 5h2 + 4h2
A. 12h2 - 5 B. 12h2 C. 7h2 D. 7h6
Mathematics
Solve the equation.16t3 - 81t = 0
A. {0}
B. 
C. 
D. 
Mathematics
Find the requested angle.Supplement of 45°
A. 90° B. 45° C. 135° D. 315°
Mathematics
Solve the problem.The long jump record, in feet, at a particular school can be modeled by 
where x is the number of years since records began to be kept at the school. What is the record for the long jump 
after record started being kept? Round your answer to the nearest tenth.
A. 26.9 feet B. 27.0 feet C. 27.1 feet D. 21.5 feet
Mathematics