Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.-x-4
A. -4x
B. - 
C. 4x
D. 
Answer: B
Mathematics
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Decide whether or not the given equation is an identity.cos(90° - x) = sin x
A. Yes B. No
Mathematics
Solve the problem.Find the length of the unknown side of the right triangle, where a and b are the legs and c is the hypotenuse. a = 6, b = ?, c = 10
A. b = 10 B. b = 8 C. b = 7 D. b = 9
Mathematics
Solve the system of equations.
A. inconsistent (no solution) B. x = 3, y = -5, z = -2 C. x = -2, y = 3, z = -5 D. x = -2, y = -5, z = 3
Mathematics
Use these sets to find the following. Identify any disjoint sets.Let U = {8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, M = {8, 10, 12, 14}, 
and 
? ? N
A. {8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18} B. N, or {9, 11, 13, 15, 17}; N and ? are disjoint sets. C. ?; N and ? are disjoint sets. D. {10, 12, 14, 16, 18}
Mathematics