The percent concentration y of a certain drug in the bloodstream at any time t in minutes is given by the equation
?
.
?
Graph this equation for 
.
?
A. 
B. 
C. 
D. 
E. 
Answer: D
Mathematics
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Find an equation for the graph.
A. y = 4 sin 
B. y = 3 sin (4x)
C. y = 4 sin (3x)
D. y = 3 sin 
Mathematics
Use the given information to find the exact value of the trigonometric function.cos ? = - 
; The terminal side of ? lies in Quadrant III.
Find cos 
.
A. - 
B. - 
C. 
D. 
Mathematics
Solve the problem.It costs $900 to start up a business of selling hot dogs. Each hot dog costs 
to produce. Let y be the cost in dollars of producing x hot dogs. Write the cost equation.
A. y = .55x - 900 B. y = .55x + 900 C. y = 900x + .55 D. y = 55x + 900
Mathematics
Solve by elimination. -6x + 9y = 78 -2x + 7y = 50
A. (-5, 7) B. (-4, 6) C. (-4, 7) D. No solution
Mathematics