Simplify the expression. Write the result using positive exponents only.
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.The gross national product for the United States was 
. Round this amount to the nearest ten-billion.
A. $56,300,000,000,000 B. $56,340,000,000,000 C. $56,341,000,000,000 D. $60,000,000,000,000
Find the exact value under the given conditions.sin ? = 
, 0 < ? < 
; cos ? = 
, 0 < ? < 
Find cos (? + ?).
A. 
B. 
C. 
D. 
Graph the function using its vertex, axis of symmetry, and intercepts.f(x) = -x2 + 8x - 7 
A. vertex (-4, 9)
intercepts (-7, 0), (- 1, 0), (0, -7)
B. vertex (4, 9)
intercepts (7, 0), (1, 0), (0, -7)
C. vertex (4, -9)
intercepts (7, 0), (1, 0), (0, 7)
D. vertex (-4, -9)
intercepts (-7, 0), (- 1, 0), (0, 7)
Find the intervals on which the function is continuous.y = 
A. discontinuous only when ? = 0
B. discontinuous only when ? = 
C. continuous everywhere
D. discontinuous only when ? = ?