Solve the problem.When making a telephone call using a calling card, a call lasting 6 minutes cost $2.80. A call lasting 13 minutes cost $5.60. Let f(x) be the cost of making a call lasting x minutes using a calling card. Write a linear function that models the cost of making a call lasting x minutes.
A. f(x) = 0.4x + 0.4
B. f(x) = -0.4x + 5.2
C. f(x) = 
x - 
D. f(x) = 0.4x - 7.4
Answer: A
Mathematics
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sin 
- cos 
sin 
A. 
B. 
C. 1
D. 
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Write the first five terms of the geometric sequence.a1 = 2; r = 5
A. 2, 10, 50, 250, 1250 B. 2, 7, 12, 17, 22 C. 5, 10, 20, 40, 80 D. 10, 50, 250, 1250, 6250
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The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).xy = 1
A. 2r2 sin ? cos ? = 1 B. r2 sin 2? = 2 C. 2r sin ? cos ? = 1 D. r sin 2? = 2
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Express the product as a sum containing only sines or cosines.cos (2?) cos (4?)
A. 
[cos (6?) - cos (2?)]
B. 
[cos (2?) + cos (6?)]
C. 
[cos (6?) - sin (2?)]
D. cos2 (6?2)
Mathematics