Solve the problem.A construction worker tosses a scrap piece of lumber from the roof of a building. How long does it take the piece of lumber to reach the ground 81 feet below? Use the formula 
where d is the distance (in feet) a freely falling object falls in t seconds. Give your answer as a fraction.
A. 
sec
B. 
sec
C. 
sec
D. 
sec
Answer: B
Mathematics
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Answer the following question involving a conversion within the USCS system.How many gallons are in 77 barrels of petroleum?
A. 1.8 gal B. 2387 gal C. 3234 gal D. 4004 gal
Mathematics
Simplify, leaving exponents in the answer.
A. 9(u-v) B. 9u - 9v C. 9(u+v) D. 9(v-u)
Mathematics
Insert ? or ? in the blank to make the statement true.{8, 12} 
{5, -6, 10, -8, 12, 7}
A. ? B. ?
Mathematics
Determine whether the equation defines y as a function of x. y = 8x2 - 8x + 9
A. function B. not a function
Mathematics