Complete the sentence so the result is an identity. Let x be any real number.
= 
A. sec x
B. cos x
C. cot x
D. csc x
Answer: B
Mathematics
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Use the LCD to clear fractions and solve the given equation.
x + 
= 
A. 
B. 
C. - 
D. 
Mathematics
Simplify the algebraic expression.-6x9 - 11x9
A. -18x9 B. -17x18 C. -17x81 D. -17x9
Mathematics
Simplify the expression.-1 + 8(8 - 7m)
A. 63 + 56m B. 64 - 56m C. 63 - 56m D. 63 - 7m
Mathematics
Solve the problem.Suppose that the number of frequent flier miles (in billions) earned by customers of various airlines, but not yet redeemed in year x, could be approximated by the polynomial function: f(x) = 0.0017x4 - 0.68x3 + 11.33x2 - 20.15x 
where x = 0 corresponds 1980. How many unredeemed miles were there in 1983?
A. About 47 billion B. About 23 billion C. About 65 billion D. About 29 billion
Mathematics