Solve.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 an object falls in feet and t is the time of the fall in seconds.
A. 
sec
B. 
sec
C. 5.0625 sec
D. 2.25 sec
Answer: D
You might also like to view...
Provide an appropriate response.When two linear equations are solved for y and the slopes are different and the y-intercepts are equal, the lines are 
A. one graph B. intersecting C. parallel
Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(2) = 9, u '(2) = 3, v(2) = -1, v '(2) = -4.
(3v - u) at x = 2
A. -15 B. -9 C. 6 D. -12
Use the graph to solve the problem.The graph depicts a relationship between scores achieved on an unspecified standardized test and family income. Find the rate of change of test scores with respect to family income.
A. 1 point(s) per thousand dollars B. 10.1 point(s) per thousand dollars C. 1000 point(s) per thousand dollars D. 100 point(s) per thousand dollars
Choose the sketch that has the indicated slope.m = 
A. 
B. 
C. 
D. 