Solve the problem.Julie and Eric row their boat (at a constant speed) 16 miles downstream for 2 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 8 hours. Find the rate of the current.
A. 5 mph
B. 2.5 mph
C. 4 mph
D. 3 mph
Answer: D
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Determine where the given function is concave up and where it is concave down. f(x) = x3 + 3x2 - x - 24
A. Concave down on (-?, -1) and (1, ?), concave up on (-1, 1) B. Concave up on (-?, -1), concave down on (-1, ?) C. Concave down for all x D. Concave up on (-1, ?), concave down on (-?, -1)
Use a calculator to find the value of y in degrees rounded to two decimal places.y = cos-1 (-0.4541)
A. 117.01° B. -27.01° C. 24.42° D. 27.01°
Solve the problem.A musician plans to perform 5 selections for a concert. If he can choose from 7 different selections, how many ways can he arrange his program?
A. 35 B. 21 C. 16,807 D. 2520
Answer the following statement(s) true (T) or false (F)
1. A system of two linear equations has exactly one solution. 2. If three vertices of a parallelogram are (0, 0), (2, 0) and (5, 4), then the fourth vertex is (7, 4). 3. If three of the vertices of a rectangle are (-a, 0), (a, 0) and (-a, b), then the fourth vertex is (a,-b).