Find the equation of the circle satisfying the given conditions.Center at (5, -2) and tangent to the x-axis.
A. (x - 5)2 + (y + 2)2 = 4
B. (x - 5)2 + (y + 2)2 = 25
C. (x - 5)2 + (y + 2)2 = 2
D. (x - 5)2 + (y + 2)2 = 5
Answer: A
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Find a formula for the nth term of the sequence.1, - 
, 
, - 
, 
(reciprocals of squares with alternating signs)
A. an = 
B. an = 
C. an = 
D. an = 
Graph the line described.Through (0, 3); m = - 
A. 
B. 
C. 
D. 
Solve the system of equations using substitution.
A. x = 
, y = 
; x = 1, y = 5
or 
, (1, 5)
B. x = - 
, y = 2; x = 1, y = 5
or 
, (1, 5)
C. x = 
, y = 6; x = - 
, y = 
or 
), 
D. x = 
, y = 
; x = - 
, y = 0
or 
, 
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Sheri wanted to know the total number of hours she worked this week. Her time card indicated the following hours: Monday, 5.94 hours; Tuesday, 10.23 hours; Thursday, 4.97 hours. How many hours has Sheri worked?
A. Estimate: 21 hours; exact: 21.14 hours B. Estimate: 21 hours; exact: 22.14 hours C. Estimate: 20 hours; exact: 21.14 hours D. Estimate: 19 hours; exact: 22.14 hours