The given pattern continues. Write down the nth term of the sequence suggested by the pattern.
, 
, 
, 
, 
, ...
A. an = 
B. an = 
C. an = 
D. an = 
n-1
Answer: B
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Find the focus and directrix of the parabola.x2 = -8y
A. (0, -2); y = -2 B. (-2, 0); y = 2 C. (0, -2); y = 2 D. (0, -2); x = 2
Find the coordinates of the midpoint of the line segment PQ.P(u, v), Q(v, u)
A. (uv, uv)
B. (u + v, u + v)
C. 
D. 
Solve the problem.An oil well off the Gulf Coast is leaking, with the leak spreading oil over the surface of the gulf as a circle. At any time t, in minutes, after the beginning of the leak, the radius of the oil slick on the surface is 
Find the area A of the oil slick as a function of time.
A. A(r(t)) = 36?t2 B. A(r(t)) = 36t2 C. A(r(t)) = 36?t D. A(r(t)) = 6?t2
Solve the problem.Between which two consecutive integers is 
?
A. 5 and 6 B. 5 and 7 C. 39 and 41 D. 6 and 7