Solve the system of equations.2x2 - 5y2 = 52x2 + 4y2 = 86
A. (-5, -3), (-3, -5)
B. (5, 3), (3, 5), (-5, -3), (-3, -5)
C. (5, 3), (-5, 3), (5, -3), (-5, -3)
D. (5, -3), (5, 3)
Answer: C
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Find the formula and limit as requested.For the function f(x) = 9 - 3x2 , find a formula for the lower sum obtained by dividing the interval [0, 1] into n equal subintervals. Then take the limit as n?? to calculate the area under the curve over [0, 1].
A. 
; Area = 1
B. 9 - 
; Area = 8
C. 9 + 
; Area = 10
D. 9 - 
; Area = 8
Find the average rate of change for the function between the given values.f(x) = 
; from 2 to 8
A. 
B. - 
C. 7
D. 2
Use Cramer's rule to solve the system of equations. If D = 0, use another method to determine the solution set. x + y = 45x + 5y = 20
A. {(5, -1)} B. Cramer's rule does not apply since D = 0; ? C. Cramer's rule does not apply since D = 0; {(4 - y, y)} D. {(0, 0)}
Solve the equation graphically by finding x-intercepts.x2 + 25 = 10x
A. x = -5 or x = 5
B. x = -
or x = 
C. x = 5
D. x = -5