Find all numbers that must be excluded from the domain of the rational expression.
A. x ? 8, x ? -8
B. x ? -3
C. x ? 64
D. x ? 8
Answer: A
Mathematics
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Simplify the expression.cot x sec x sin x
A. csc2 x B. sec2 x C. tan2 x D. 1
Mathematics
Solve the problem.Joel has started a business mowing lawns for the summer. The bar graph below tracks his net income for five weeks. 
Find the difference in Joel's net income between week 5 and week 3.
A. $167 B. $121 C. $111 D. $177
Mathematics
Find an expression equivalent to the one given.
A. - 
B. - 
C. 
D. 
Mathematics
Solve the system of equations by elimination.
A. x = -4, y = 7; (-4, 7) B. x = 9, y = -9; (9, -9) C. x = -7, y = 7; (-7, 7) D. x = 7, y = -7; (7, -7)
Mathematics