Use a Venn diagram to find the GCF or LCM as indicated.Given 30 and 90, find the LCM.
A. 270
B. 90
C. 30
D. 180
Answer: B
Mathematics
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Find a value of a so that f is continuous at c, or indicate this is impossible.f(x) = 
A. -5 B. 1 C. Impossible D. -1
Mathematics
Determine the center (or vertex if the curve is a parabola) of the given curve.9y2 + 16x2 + 72y = 0
A. (0, -4) B. (-3, 0) C. (0, 4) D. (3, 0)
Mathematics
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the hydrogen ion concentration if the 
A. 3.98 × 10-2 B. 2.51 × 10-2 C. 2.51 × 10-3 D. 3.98 × 10-3
Mathematics
Solve.
= 
A. 1.71 B. 0.21 C. 6.4 D. 17.1
Mathematics