Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.21, 12 , 3, -6, . . .
A. an = 30 - 9n; a20 = -150
B. an = 9n - 30; a20 = 150
C. an = 21 - 9n; a20 = -159
D. an = 9n - 21; a20 = 159
Answer: A
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A. 
B. 1
C. 
D. 
Find the eccentricity of the hyperbola.x2 - y2 = 2
A. 
B. 2
C. 
D. 0
Write the equation in standard form. Then identify the vertex of the parabola.y = x2 - 8x + 5
A. y = (x - 4)2+ 5; (-4, 5) B. y = (x - 4)2 - 11; (4, -11) C. y = (x + 4)2 - 11; (-4, -11) D. y = (x - 4)2 + 5; (4, 5)
Solve the problem. First use front end rounding. Then find the exact answer.A particular model of side-loading washing machine costs $170 more than a top-loading machine. If the top-loading machine costs $289, find the cost of the side-loading machine.
A. Estimate: $100; exact: $119 B. Estimate: $500; exact: $459 C. Estimate: $120; exact: $119 D. Estimate: $460; exact: $459