Three out of ten motorcyclists wear safety helmets. If two motorcyclists are chosen, what is the probability that both wear a safety helmet?
A. 
B. 
C. 
D. 
E. 
Answer: D
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Rationalize the denominator of the following expression and then simplify your answer.
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A. 
B. 
C. 
D. 
E. 
Solve.Beaufort Canal has a semi-elliptical cross section with a width W = 55 feet and a depth D = 13 feet (see figure). The keel on Sasha's yacht rides 5 feet below the water line at the keel's deepest point. If the yacht travels parallel to the canal, and assuming the canal is completely full of water, how close can Sasha bring the yacht's centerline to the edge of the canal without running aground? (The keel is the very bottom of a boat hull and runs directly below the boat's centerline from front to back.)
A. 5 ft B. 4 ft C. 2 ft D. 25 ft
Find a general term an for the arithmetic sequence.a1 = 0.15, d = 0.05
A. an = 0.1n + 0.1 B. an = 0.15 + 0.05n C. an = 0.1n + 0.2 D. an = 0.05n + 0.1
Find the vertex of the parabola.f(x) = -2x2 + 13x + 6
A. 
B. 
C. 
D. 