Find the product of the two binomials.(x + 9y)(x - 3y)
A. x2 + 3xy - 27y2
B. x + 6xy - 27y
C. x2 + 6xy - 27y2
D. x2 + 6xy + 6y2
Answer: C
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Add or subtract as indicated. Write the answer in simplest form.
+ 
A. 
B. 
C. 
D. 
Find the unknown number in the proportion. Round answer to the nearest hundredth when necessary.
= 
A. x = 3 B. x = 8.3 C. x = 30 D. x = 0.12
Find the expected value.A new light bulb has been found to have a 0.02 probability of being defective. A shop owner receives 500 bulbs of this kind. How many of these bulbs are expected to be defective?
A. 20 B. 100 C. 10 D. 500
Solve the problem.An experimental model for a suspension bridge is built in the shape of a parabolic arch. In one section, cable runs from the top of one tower down to the roadway, just touching it there, and up again to the top of a second tower. The towers are both 12.25 inches tall and stand 70 inches apart. Find the vertical distance from the roadway to the cable at a point on the road 14 inches from the lowest point of the cable.
A. 2.16 in. B. 7.84 in. C. 1.76 in. D. 1.96 in.