Determine whether the following is a difference of squares.-9x2+ 9y2
A. Yes
B. No
Answer: A
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Compute the sales tax. Round to the nearest cent, if necessary.
A. $2.21 B. $2.26 C. $2.11 D. $2.41
Solve the problem.An arch for a bridge over a highway is in the form of a semiellipse. The top of the arch is 35 meters above ground. The main span is 69.71 meters wide. Write an equation for the ellipse in which the x-axis coincides with the ground and the y-axis passes through the center of the arch.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve the problem.The number N, in millions of Americans of age x with arthritis, is estimated with the following graph.
What approximate age (closest integer) has the most arthritic Americans?
A. 65 B. 60 C. 21 D. 88
Multiply.(4x - 7)(x + 12)
A. 4x2 + 39x - 84 B. 4x2 + 41x - 84 C. 4x2 + 41x + 41 D. 4x2 - 84x + 41