Solve the problem.Find the unknown number given the following description:If 9 is subtracted from a number, then the result is at least 4.
A. All numbers less than or equal to 13
B. All numbers greater than or equal to -5
C. All numbers less than or equal to 5
D. All numbers greater than or equal to 13
Answer: D
Mathematics
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Simplify the given expression. Expansion of any term is not necessary; proper recognition of the form of the expression leads to the proper result.2 cos2 4x - 1
A. 
sin 16x
B. 2 sin 4x
C. cos 8x
D. cos 4x
Mathematics
Find the slope of the line.
A. 
B. - 5
C. 5
D. - 
Mathematics
Find all numbers that must be excluded from the domain of the rational expression.
A. x ? 0 B. x ? 6 C. x ? -6, x ? -9 D. x ? 6, x ? 9
Mathematics
Solve the problem.Find the first term of a geometric sequence with seventh term 
and common ratio of 
A. 
B. 1
C. 2
D. 
Mathematics