Find an equation for the ellipse described. Graph the equation.Foci at (0, 5) and (-8, 5); vertex at (-9, 5)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
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Solve the problem.Suppose y = mx + b is a mathematical model for actual time as a function of estimated time, where y represents actual time and x represents estimated time and m and b are constants. If m = 2.2 and b = -3.9, find y when x is 30 min.
A. 21.42 min B. 69.9 min C. 62.1 min D. 38.58 min
Find the domain of the given function.f(x) = 
A. all real numbers x where x ? 6
B. all real numbers x where x ? -6
C. all real numbers x where x > 
D. all real numbers x where x > 6
Graph the function by starting with the graph of the basic function and then using the techniques of shifting, compressing, stretching, and/or reflecting.f(x) = x2 + 1
A. 
B. 
C. 
D. 
Find the product.(4x + 9)(4x - 9)
A. 16x2 + 72x - 81 B. 16x2 - 72x - 81 C. x2 - 81 D. 16x2 - 81