Write an equation to describe the variation. Use k for the constant of proportionality.s varies jointly as t and the cube of u.
A. s = k + t + u3
B. s + t + u3 = k
C. stu3 = k
D. s = ktu3
Answer: D
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Find the limit of the sequence if it converges; otherwise indicate divergence.an = 1 + (0.2)n
A. 2 B. 1.2 C. 1 D. Diverges
Answer the question.The lowest point on the graph of f(x) = ?x? + 14 has what coordinates?
A. (14, 0) B. (14, 14) C. (0, 0) D. (0, 14)
Identify the type of graph.-x2 - 6x + 5y2 + 10y = 25
A. The equation has no graph.
B. The graph is an ellipse with center 
.
C. The graph is a circle with center 
.
D. The graph is a hyperbola opening to the right and left.
Solve the problem.The formula 
represents the number of households N, in thousands, in a certain city that have a computer x years after 1990. According to the formula, in what year were there 87 thousand households with computers in this city?
A. 1992 B. 1995 C. 1993 D. 1994