Which of the following systems have infinitely many solutions?I. 
II. 
III. 
IV. 
A. III and IV only
B. I and II only
C. I, II, and III only
D. I, II, and IV only
E. all of these
Answer: D
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Simplify the difference quotients 
and 
for the following function. Rationalize the numerator when necessary.f(x) = 9x + 2
A. 9; 9 B. 9h; 9a C. 9x - 9h; 9x - 9a D. 9; 9x - 9a
Solve the problem.Find the missing length in the following right triangle. If necessary, round to the nearest tenth. 
A. 14 in. B. 221 in. C. 21 in. D. 442 in.
Find the product.(6k + 1)3
A. 216k3 + 1 B. 216k3 + 72k2 + 12k + 1 C. 216k3 + 216k2 + 18k + 1 D. 216k3 + 108k2 + 18k + 1
Solve triangle ABC. If necessary, round the answer to the nearest tenth. 
A. B = 60°, a = 4.3 m, c = 6 m B. B = 50°, a = 6 m, c = 4.3m C. B = 55°, a = 4.3 m, c = 6 m D. B = 55°, a = 6 m, c = 4.3 m