Solve the problem.Martha can rake the leaves in her yard in 7 hours. Her brother can do the job in 4 hours. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 
hr
D. 
hr
Answer: C
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Determine independence. Answer Yes or No.The table shows the political affiliation of voters in one city and their positions on stronger gun control laws. ?Stronger Gun Control 
Are party affiliation and position on gun control laws independent?
A. Yes B. No
The lists below show five agricultural crops in Alabama, Arkansas, and Louisiana.AlabamaArkansasLouisianasoybeans (s)soybeans (s)soybeans (s) peanuts (p)rice (r)sugarcane (n)corn (c)cotton (t)rice (r)hay (h)hay (h)corn (c)wheat (w)wheat (w)cotton (t)Let U be the smallest possible universal set that includes all of the crops listed; and let A, K, and L be the sets of five crops in Alabama, Arkansas, and Louisiana, respectively. Find the indicated set.L ? K
A. {c, h, n, r, s, t, w} B. {c, n, r, s, t} C. {r, s, t} D. {c, h, n, w}
Solve the proportion for the given variable. 
= 
A. 3
B. 4
C. 30
D. 24
Use a graphing utility to graph the function over the indicated interval and approximate any local maxima and local minima. Determine where the function is increasing and where it is decreasing. If necessary, round answers to two decimal places.f(x) = -0.3x3 + 0.2x2 + 4x - 5; (-4, 5)
A. local maximum at (-1.9, -9.82) local minimum at (2.34, 1.61) increasing on [-1.9, 2.34] decreasing on [-4, -1.9] and [2.34, 5] B. local maximum at (2.34, 1.61) local minimum at (-1.9, -9.82) increasing on [-4, -1.9] and [2.34, 5] decreasing on [-1.9, 2.34] C. local maximum at (2.34, 1.61) local minimum at (-1.9, -9.82) increasing on [-1.9, 2.34] decreasing on [-4, -1.9] and [2.34, 5] D. local maximum at (-1.9, -9.82) local minimum at (2.34, 1.61) increasing on [-4, -1.9] and [2.34, 5] decreasing on [-1.9, 2.34]