Solve the problem.A rectangle has a length of x + 5 and a width of x - 5 and has an area of 56 square units. Find the length and width of the rectangle. (A = LW)
A. width = 1 unit; length = 56 units
B. width = 2 units; length = 28 units
C. width = 7 units; length = 8 units
D. width = 4 units; length = 14 units
Answer: D
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Use the discriminant to determine if the equation can be solved by factoring. If the equation can be solved by factoring, then factor it.c2 + 6c + 9 = 0
A. (c + 3)2 = 0 B. (c + 3)(c - 3) = 0 C. (c - 3)2 = 0 D. Cannot be solved by factoring
Find the following. Assume that letters can represent any real number.
A. x
B. x2
C. Not a real number
D. 
Solve the problem.A pharmaceutical company introduces a new headache medication on the market. They advertise the product on television and find that the percentage P of people who buy the product after t weeks satisfies the function 
What percentage buy the product after 16 weeks? Round to the nearest tenth of a percent when necessary.
A. 21.3% B. 14.2% C. 17.8% D. 19.6%
Find the exact value by using a half-angle identity.cos 
A. - 
B. 
C. 
D. - 
