Factor by grouping.x2 - 4x - 5x + 20
A. (x - 4)(x + 10)
B. -9x(x2 + 20)
C. (x - 4)(x - 5)
D. (x + 4)(x - 5)
Answer: C
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Solve the problem.The function A = A0e-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 800 pounds of the material are initially put into the vault, how many pounds will be left after 160 years?
A. 519 pounds B. 250 pounds C. 640 pounds D. 264 pounds
Solve the problem.A projectile is thrown upward so that its distance, in feet, above the ground after t seconds is 
What is its maximum height?
A. 9472 ft B. 304,304 ft C. 5776 ft D. 18,411 ft
Provide an appropriate response. Add 2 ft 7 in. + 1 ft 11 in. + 2 ft 8 in. and report the result in standard notation.
A. 2 yd 1 ft 2 in. B. 7 ft 2 in. C. 31 ft D. 5 ft 26 in.
Plot and label the points indicated by the coordinate pairs.A(3, 1), B(-5, -4)
A. 
B. 
C. 
D. 