Solve the problem.Martha can rake the leaves in her yard in 8 hr. Her brother can do the job in 7 hr. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 56 hr
D. 3
hr
Answer: D
Mathematics
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Simplify.
A. a + s B. -a + s C. -1 D. -a - s
Mathematics
Find the standard equation of the circle that satisfies the conditions.Center (-1, 3), radius 
A. (x - 1)2 + (y + 3)2 = 6 B. (x - 3)2 + (y + 1)2 = 36 C. (x + 3)2 + (y - 1)2 = 36 D. (x + 1)2 + (y - 3)2 = 6
Mathematics
Find an equation in slope-intercept form of the line that passes through the given point and has slope m.(5, 6); m is undefined
A. x = 6 B. y = 5 C. x = 5 D. y = 6
Mathematics
Solve the problem.If f(x) = cos x and f(a) = - 
, find the exact value of f(a) + f(a - 2?) + f(a + 4?).
A. - 
B. -36
C. -12
D. - 
Mathematics