Solve.Martha can rake the leaves in her yard in 6 hours. Her younger brother can do the job in 7 hours. How long will it take them to do the job if they work together?
A. 7 hr
B. 
hr
C. 
hr
D. 42 hr
Answer: B
Mathematics
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Find the derivative of the function.r = 
(4 - ?)
A. 
= - 
- 1
B. 
= 
+ 4
C. 
= 
+ 1
D. 
= ?2 - 1
Mathematics
Find the exact value of the expression using the provided information.Find cos(s + t) given that cos s = - 
, with s in quadrant III, and 
with t in 
A. 
B. 
C. 
D. 
Mathematics
Multiply.
A. 8.256 B. 0 C. 0.4592 D. 8
Mathematics
Perform the indicated calculation. Express your answer using scientific notation.(3 × 105)(7 × 108)
A. 21 × 1014 B. 2.1 × 1014 C. 21 × 1040 D. 2.1 × 1013
Mathematics