Use Cramer's Rule to solve the system of equations. Use technology to compute the determinants involved.
A. {(2, 7, 3)}
B. {(9, 3, 9)}
C. {(1, -9, -3)}
D. {(1, 9, 3)}
Answer: D
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The table below shows the hourly rates for a personal trainer at a health club. Write an equation that describes the cost of x hours of training, and then determine the cost of 5 hours: Hours (x) Cost (C) 1 $55 2 $100 3 $130 X ? ?
A. ?? = 55x, C(5) = 275 B. ?C = x + 55, C(5) = 60 C. ?C = 55(3), C(5) = 165 D. ??C = 55x +55, C(5) = 330 E. ?C = 55x, C(5) = 255
Solve.The speed of a ball dropped from a tower is given by the linear function f(t) = 32t where f(t) is in feet per second and t is the number of seconds since the ball was dropped. Find the speed of the ball after 6 seconds.
A. 192 feet per second B. 6 feet per second C. 182 feet per second D. 32 feet per second
Use a calculator to find the value of the expression rounded to two decimal places.sin-1 
A. 16.60 B. 1.28 C. 73.40 D. 0.29
Find the vertex and directrix of the parabola.
A. vertex: 
directrix: y=1
B. vertex: 
directrix: y=12
C. vertex: 
directrix: y=6
D. vertex: 
directrix: y=-1
E. vertex: 
directrix: y=-7