Solve.When making a telephone call using a calling card, a call lasting 5 minutes cost $0.90. A call lasting 12 minutes cost $1.60. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of making a call lasting x minutes.
A. y = 0.1x + 0.4
B. y = -0.1x + 1.4
C. y = 0.1x - 10.4
D. y = 10x - 
Answer: A
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?Which of the following is a divisibility rule for 18? ?
A. If a number ends in an even number and is divisible by 3, then it is divisible by 18. B. ?If a number ends in an even number and the sum of digits is divisible by 9, then it is divisible by 18. C. ?If last two digits of a number are divisible by 4 and the sum of digits is divisible by 9, then it is divisible by 18. D. If a number ends in an even number and the sum of digits is divisible by 6, then it is divisible by 18. E. ?If the sum of the digits of a number is divisible by 3 and 6-rule works, then it is divisible by 18.
Solve the problem.Find the tangent line(s) at the pole for the curve 
A. ? = 
(y = -x)
B. ? = 
(y = x)
C. ? = 
(x = 0)
D. ? = 0 (y = 0)
Determine what percent of the figure is shaded.
A. 40%
B. 30%
C. 60%
D. 66
%
Evaluate or simplify the given expression.sin (tan-1 x)
A. 
B. 
C. 
D. 