Solve the problem.Martha can rake the leaves in her yard in 2 hours. Her brother can do the job in 8 hours. How long will it take them to do the job working together?
A. 2
hr
B. 
hr
C. 1
hr
D. 
hr
Answer: C
Mathematics
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Use the appropriate sum or difference identity to write the given expression as a function of x alone.cos (x + 2?)
A. -cos x B. cos x C. -sin x D. sin x
Mathematics
Perform the indicated operation without the use of a calculator and express each answer in decimal notation.
A. 60,000 B. 0.06 C. 0.00001667 D. 0.0006
Mathematics
Round to the place value indicated.4,455 to the nearest thousand
A. 5,000 B. 4,000 C. 3,900 D. 4,100
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (-2)2(-2)3
A. -64
B. -32
C. 
D. 
Mathematics