Solve.Martha can rake the leaves in her yard in 5 hours. Her younger brother can do the job in 6 hours. How long will it take them to do the job if they work together?
A. 30 hr
B. 6 hr
C. 
hr
D. 
hr
Answer: C
Mathematics
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A. 
sin-1 
+ C
B. sin-1 
+ C
C. tan-1 
+ C
D. 
tan-1 
+ C
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Find the local maximum, and minimum value and saddle points of the function.
f(x,y) = x² - xy + y² - 9x + 6y + 9
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Find an equation for the parabola described.Focus at (0, -3); directrix the line x = -2
A. (x + 3)2 = 4(y + 1) B. (y + 3)2 = 4(x + 1) C. (x + 1)2 = 4(y + 3) D. (y + 3)2 = -4(x + 1)
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Solve the system by the elimination method or a combination of the elimination and substitution methods.x2 + y2 = 16x2 - y2 = 16
A. {(4, 4), (-4, 4)} B. {(4, 0), (4, 4)} C. {(-4, 0), (-4, 4)} D. {(4, 0), (-4, 0)}
Mathematics