Use the graph to solve the problem.The surface area a of a cylinder is shown in the graph below. What is the radius r if the surface area is 
A. 0.6 m
B. 1.2 m
C. 0.8 m
D. 1.0 m
Answer: D
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Find the standard-form equation of the hyperbola centered at the origin which satisfies the given conditions.Foci at (0, -15), (0, 15); asymptotes: y = 
x, y = - 
x
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Solve the problem.If P dollars are deposited every 2 weeks in an account paying an annual interest rate r expressed as a decimal, then the amount A in the account after 3 years can be approximated by A = 
÷ 
Write this expression as a complex fraction.
A. 
B. 
C. 
D. 
Rationalize the denominator.
A. 
- 
B. 
C. 
D. 
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 × 10-10 B. 2.51 × 10-10 C. 3.98 × 10-9 D. 2.51 × 10-9