Find an equation for the hyperbola described.Center at (8, 9); focus at (4, 9); vertex at (7, 9)
A. (x - 9)2 - 
= 1
B. 
- (y - 8)2 = 1
C. (x - 8)2 - 
= 1
D. 
- (y - 9)2 = 1
Answer: C
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Graph each system of inequalities and shade the portion of the graph represented by the solution set..
A. 
B. 
C. 
D. 
Determine if the given function y = f(x) is a solution of the accompanying differential equation.y' + y = e2xy = 2e- x + e2x
A. Yes B. No
Find a ? b.a = 7i - 9j, b = 3i + 5j
A. 
B. -66
C. 
D. -24
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 809. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 60-hour review course. Round your answer to the tenths place.
A. 775.8 B. 766.0 C. 754.5 D. 761.8