Solve.The monthly cost of a certain long distance service is given by the linear function 
where C(t) is in dollars and t is the amount of time in minutes called in a month. Find the cost of calling long distance for 120 minutes in a month.
A. $18.55
B. $20.95
C. $9.60
D. $17.55
Answer: A
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Solve the problem.In the formula N = Iekt, N is the number of items in terms of an initial population I at a given time t and k is a growth constant equal to the percent of growth per unit time. There are currently 63 million cars in a certain country, increasing by 5.1% annually. How many years will it take for this country to have 86 million cars? Round to the nearest year.
A. 5 years B. 3 years C. 61 years D. 6 years
Decide whether or not the functions are inverses of each other.f(x) = 2x - 7, g(x) = 
A. Yes B. No
From the graph of the parabola, determine whether the parabola opens upward or downward, and find the vertex, axis of symmetry, and range of the function. Find the maximum or minimum value of the function and the intervals on which the function is increasing or decreasing.
A. Up, (-1, -1), x = -1, [-1, ?), min -3, dec (-?, -1), inc (-1, ?) B. Up, (-1, -1), x = -1, [-1, ?), min -1, dec (-?, -1], inc [-1, ?) C. Up, (-1, -1), x = -1, [-3, 1], min -3, dec (-?, -1], inc [-1, ?) D. Up, (-1, -1), x = -1, [-1, ?), min -1, inc (-?, -1], dec [-1, ?)
Use the determinant feature of a graphing calculator to solve the system by Cramer's rule . (Round to one decimal place.)1.5x + 3.1y - 2.3z + 0.6w = 2.76.1x - 0.5z - 3.4w = 0.811.5y - 2.2w = 04.0x + 3.0y - 2.1z = 9
A. {(4.3, 1.3, 4.9, 6.7)} B. {(3.6, 1.1, 4.1, 5.6)} C. {(3.2, 1.0, 3.7, 5.0)} D. {(7.9, 2.4, 9.0, 12.3)}