Use a graphing calculator to sketch the graph of the quadratic equation, and then determine the x-intervals over which the graph is increasing and decreasing.y = -2x2 + 4x + 7
A. Increasing: (x < -1), Decreasing: (x > -1)
B. Increasing: (x < 1), Decreasing: (x > 1)
C. Increasing: (x < 5), Decreasing: (x > 5)
D. Increasing: (x < 7), Decreasing: (x > 7)
Answer: B
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Provide an appropriate response.Solve the system of equations using the substitution method:3a + 4b = 162a - b = -15
A. a = 0, b = -4 B. a = 7, b = -1 C. a = 7, b = -4 D. a = -4, b = 7
Divide.
A. 
- 
i
B. 
- 
i
C. 
+ 
i
D. 
+ 
i
For the given functions f and g, find the indicated value.f(x) = 
, g(x) = 3x(f ? g)(2)
A. 
B. 3
C. 
D. 3
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. 102 B. 10-2 C. 0.5 D. 0.69