Use a calculator to find the function value to four decimal places.sin 49.5°
A. 0.6494
B. -0.6929
C. 1.1708
D. 0.7604
Answer: D
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Solve the problem.The altitude above sea level of an airplane just after taking off from an airport on a high plateau is given by the linear function y = 800x + 2179, where y is in feet and x is the time in minutes since take-off. Find and interpret the slope and y-intercept.
A. m = 2179; The minutes since take-off increases 2179 for every foot of altitude. 
The minutes that the plane takes to get to the altitude of the airport from sea level.
B. m = 800; The altitude of the airplane increases 800 feet every minute. b = 2179; The altitude of the airport where the airplane took-off is 2179 feet above sea level.
C. m = 2179; The altitude of the airplane increases 2179 feet every minute. b = 2179; The altitude of the airport where the airplane took-off is 800 feet above sea level.
D. m = 800; The minutes since take-off increases 800 for every foot of altitude. 
; The minutes that the plane takes to get to the altitude of the airport from sea level.
Solve the system by the addition method.
A. {(0, 14)} B. {(0, 14), (0, -14)} C. {(14, 0)} D. {(14, 0), (-14, 0)}
Simplify. Assume that all variables represent positive numbers.
A. 5x
B. 5xy2
C. 5xy
D. 5x2
Find the constant of variation, k. t varies directly with r and inversely with s; t = 3 when r = 21 and s = 28
A. k = -4
B. k = - 
C. k = 
D. k = 4