Add or subtract. Simplify your answer to lowest terms.
+ 
- 
A. 
B. 1
C. 
D. 
Answer: A
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Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. x + 3y = -8-14x - 4y = -2
A. {(-1, 3)} B. {(3, -1)} C. {(-3, 1)} D. {(1, -3)}
Use factoring to solve the equation.x2 + 10x = -16
A. -2, -8 B. 2, -8 C. 2, 8 D. -2, 8
Find the amount that results from the investment.$12,000 invested at 12% compounded quarterly after a period of 8 years
A. $29,711.56 B. $30,900.99 C. $30,000.96 D. $18,900.99
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 × 10-3 B. 2.51 × 10-3 C. 2.51 × 10-2 D. 3.98 × 10-2