Choose the best answer.The area of the face of a quarter is about
A. 57 m2
B. 57 dm2
C. 57 mm2
D. 57 cm2
Answer: C
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Solve.The number G of gears a machine can make varies directly as the time T it operates. If it can make 6334 gears in 8 hours, how many gears can it make in 9 hours?
A. 791.75 gears B. 7125.75 gears C. 0.0114 gears D. 6351 gears
Perform the indicated operations. Write the resulting polynomial in standard form.(5x - 8y)2
A. 25x2 - 80xy + 64y2 B. 5x2 + 64y2 C. 25x2 + 64y2 D. 5x2 - 80xy + 64y2
Write a system of equations and use the inverse of the coefficient matrix to solve the system.A company makes 3 types of cable. Cable A requires 3 black, 3 white, and 2 red wires. Cable B requires 1 black, 2 white, and 1 red wires. Cable C requires 2 black, 1 white, and 2 red wires. They used 100 black, 110 white and 90 red wires. How many of each cable were made?
A. 10 cable A 103 cable B 20 cable C B. 10 cable A 30 cable B 93 cable C C. 10 cable A 30 cable B 20 cable C D. 20 cable A 93 cable B 10 cable C
Solve the problem.Students in a math class took a final exam. They took equivalent forms of the exam in monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by 
.Find S'(t).
A. S'(t) = 77 - 
B. S'(t) = - 
C. S'(t) = - 19 ln 
D. S'(t) = 