Solve the problem.When making a telephone call using a calling card, a call lasting 3 minutes costs $1.25. A call lasting 12 minutes costs $3.50. 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 (y) lasting x minutes.
A. y = -0.25x + 2
B. y = 0.25x - 8.5
C. y = 4x - 
D. y = 0.25x + 0.5
Answer: D
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Find the flux of the curl of field F through the shell S.F = exi + eyj + 2xyk; S is the portion of the paraboloid 1 - x2 - y2 = z that lies above the 
A. -2? B. 2 C. 0 D. -2
Solve the problem.A stack of 10 different cards are shuffled and spread out face down. If 4 cards are turned face up, how many different 4-card combinations are possible?
A. 210 B. 2520 C. 151,200 D. 5040
Solve the system of equations by the addition method.
A. infinite number of solutions B. (0.08, -0.01) C. (10, -1.1) D. (-2, 1)
Graph the radical function. Compare the graph to that of the square root function or cube root function.g(x) = 2
A. It looks like the graph of the square root
function, but it is stretched by a factor of 2
and reflected over the x-axis.
B. It looks like the graph of the square root
function, but it is stretched by a factor of 2
and reflected over the x-axis.
C. It looks like the graph of the cube root
function, but it is stretched by a factor of 2.
D. It looks like the graph of the square root
function, but it is stretched by a factor of 2.