Solve.A ball is thrown upward with an initial velocity of 28 meters per second from a cliff that is 
high. The height of the ball is given by the quadratic equation 
where h is in meters and t is the time in seconds since the ball was thrown. Find the time it takes the ball to hit the ground. Round your answer to the nearest tenth of a second.
A. 11.4 sec
B. 7.8 sec
C. 7.0 sec
D. 7.4 sec
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
C. Domain: all points in the xy-plane except y = 0; range: all real numbers; level curves: parabolas 
D. Domain: all points in the xy-plane except y = 0; range: real numbers z ? 0 ; level curves: parabolas 
Solve the given applied problem.A rectangular area of 2,600 ft2 is to be fenced off along the bank of a river; no fence is required along the river. If the material for the fence costs $16 per running foot for the two ends and $15 per running foot for the side parallel to the river, what end length results in a cost of $2,380.
A. 52 ft B. 100 ft C. 50 ft D. 25 ft
Solve for the indicated variable.B = 
my + 
ey for y
A. y = 
B. y = 
C. y = 
D. y = 
Solve the system of linear equations using the elimination method. x = -5 - y - z x - y + 4z= 22x + y =-4 - z
A. (-5, -1, 1) B. (-1, 1, -5) C. (-1, -5, 1) D. (1, -5, -1)