Solve.On Diana's phone bill, 60 of the 180 long-distance calls were in state. 
of the in-state calls were to her parents. What fraction of all her long-distance calls were to her parents?
A. 
of calls to parents
B. 
of calls to parents
C. 
of calls to parents
D. 
of calls to parents
Answer: B
Mathematics
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Subtract.(3.9x3 - 7.7x2 - 3) - (8.1x3 - 2.3x2 + 1)
A. -4.2x3 - 5.4x2 - 4 B. -4.2x3 - 10x2 - 4 C. 12x3 - 5.4x2 - 4 D. -4.2x3 - 5.4x2 + 4
Mathematics
Factor the expression completely.9x5 - 100x
A. x(3x2 + 10)(x + 1)(x - 1) B. (3x2 + 10)(3x2 - 10) C. x(3x2 + 10)(3x2 - 10) D. prime
Mathematics
Solve the system of equations by the substitution method.
A. (0, 8) B. (5, -7) C. infinite number of solutions D. no solution
Mathematics
Find the domain of the composite function (g ? f)(x). Write the domain in interval notation.f(x) = 
, g(x) = x - 2
A. (-?, 0) ? (0, ?) B. (-?, ?) C. (-?, 0] D. [0, ?)
Mathematics