Solve.When making a telephone call using a calling card, a call lasting 6 minutes cost $1.70. A call lasting 13 minutes cost $3.10. 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 = -0.2x + 2.9
B. y = 0.2x - 9.9
C. y = 0.2x + 0.5
D. y = 5x - 
Answer: C
Mathematics
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Plot the zeros of the given polynomial on the number line together with the zeros of the first derivative.y = (x - 4)(x + 5)2
A. 
B. 
C. 
D. 
Mathematics
Find the least common denominator.
- 
+ 
A. (x - 9)(x + 4)2 B. (x - 9)(x + 4) C. (x - 9)(x + 4)(x - 4) D. (x - 9)(x - 4)
Mathematics
Solve the problem.A plane is flying at a height of 16,689 feet above sea level. The depth of the ocean directly below the plane is 15,649 feet. How high is the plane above the ocean floor?
A. 32,338 feet B. 32,438 feet C. 1140 feet D. 1040 feet
Mathematics
In the previous problem, the solution for 
is
Select the correct answer.
?
A. 
B. 
C. 
D. 
E. 
Mathematics