Use the reference angle to find the exact value of the expression. Do not use a calculator.tan 390°
A. -
B. 
C. 
D. 
Answer: D
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Solve the problem.If a fair coin is tossed twice, the probability that both tosses will come up heads is
A. 
.
B. 
.
C. 
.
D. 
.
E. none of these
Factor the four-term polynomial by grouping.8x2 - 6xy - 20xy + 15y2
A. (2x - 5y)(4x - 3y) B. (8x - 5y)(x - 3y) C. (2x + 5y)(4x - 3y) D. (2x - 5)(4x - 3)
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 = 7 units; length = 8 units C. width = 2 units; length = 28 units D. width = 4 units; length = 14 units
For the given functions f and g, find the requested function and state its domain.f(x) = 
; g(x) = 
Find f ? g.
A. (f ? g)(x) = 
; {x|x ? 0}
B. (f ? g)(x) = 
; {x|x ? -13, x ? 0}
C. (f ? g)(x) = 
; {x|x ? -13, x ? 0}
D. (f ? g)(x) = 
; {x|x ? -13, x ? 0}