Solve the problem.A customer purchased 3 bottles of nail polish for a total of $7.80. How much does a salesperson earn on this sale if the commission rate is 39%?
A. $7.80
B. $3.04
C. $1.01
D. $30.42
Answer: B
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Solve the equation. Leave your solution in trigonometric form.
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A. 
B. 
C. 
D. 
E. 
Find the x-intercepts of the polynomial function. State whether the graph crosses the x-axis, or touches the x-axis and turns around, at each intercept. f(x) = -x2(x + 3)(x2 + 1)
A. 0, touches the x-axis and turns around; -3, crosses the x-axis B. 0, touches the x-axis and turns around; 3, crosses the x-axis C. 0, touches the x-axis and turns around; -3, crosses the x-axis; -1, crosses the x-axis; 1, crosses the x-axis; D. 0, touches the x-axis and turns around; -3, crosses the x-axis; -1, touches the x-axis and turns around
Solve the problem.The voltage E in an electrical circuit is given by E = 1.2 cos 80?t, where t is time measured in seconds. Find the amplitude.
A. 2.4 B. 1.2 C. 80? D. 80
Simplify the expression by combining like terms, if possible.(10z + 9) - (5z - 3)
A. 15z + 12 B. 5z + 6 C. 5z - 12 D. 5z + 12