A ball is thrown straight down from the top of a 200-ft building with an initial velocity of -18 ft per second. The position function is 
. What is the velocity of the ball after 4 seconds?
?
A. The velocity after 4 seconds is -82 ft per second.
B. The velocity after 4 seconds is -110 ft per second.
C. The velocity after 4 seconds is -146 ft per second.
D. The velocity after 4 seconds is -46 ft per second.
E. The velocity after 4 seconds is -292 ft per second.
Answer: C
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Identify the base and the exponent for the exponential expression.-(-11)12
A. Base: 11, exponent: 12 B. Base: 12, exponent: 11 C. Base: 12, exponent: -11 D. Base: -11, exponent: 12
Identify the domain and the range of the relation from the graph.
A. Domain: [-7, 3] Range: [-6, 4] B. Domain: (-?, 3] Range: (-?, -6] C. Domain: [-6, 4] Range: [-7, 3] D. Domain: [-7, ?) Range: [3, ?)
Solve the system of equations by the elimination method. Check your solutions. For any dependent equations, write your answer in the ordered pair form.
A. {(7, -3)} B. {(7, -4)} C. ? D. {(6, -3)}
Solve.The thickness of an airport runway's pavement is determined by the weight of the planes using it. The relationship between runway thickness x, in inches, and gross airplane weight y, in thousands of pounds, can be modeled by the equation 
If a loaded cargo plane weighs 300,000 pounds, what must the minimum thickness of the runway be? Round any partial inch up to the nearest whole inch.
A. 39 in. B. 11 in. C. 12 in. D. 40 in.