Solve.Martha can rake the leaves in her yard in 3 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. 
hr
B. 
hr
C. 
hr
D. 7 hr
Answer: C
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Solve the problem.Refer to the given preference schedule. If the Borda count method is used to determine the winner and C drops out, is Fairness Criterion 4 satisfied?
A. Yes B. No
Use differentiation to determine whether the integral formula is correct.
dx = (9x + 3)4 + C
A. No B. Yes
Find the exact values for sin s, cos s, and tan s.s = - 
A. sin s = - 
; cos s = - 
; tan s = 
B. sin s = - 
; cos s = - 
; tan s = 
C. sin s = 
; cos s = 
; tan s = 
D. sin s = - 
; cos s = - 
; tan s = -
Solve using the elimination method. If the system has an infinite number of solutions, use set-builder notation to write the solution set. If the system has no solution, state this.-0.5x + 0.5y = 0.5-0.1x + 0.1y = 0.1
A. (20, 30) B. (3, 2) C. (2, 3) D. {(x, y)|-0.5x + 0.5y = 0.5}