Write the first four terms of the geometric sequence.a = 3, a4 = -81
A. 3, -9, -27, -81
B. -3, -9, -27, -81
C. 3, -9, 27, -81
D. -9, 27, -81, 243
Answer: C
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Identrify the critical points and find the maximum and minimum value on the given interval I.f(x) = x2 + 2x; I = 
A. Critical points: 0, 2; maximum value 8; minimum value 0
B. Critical points: - 
, - 1, 
; maximum value 
; minimum value - 1
C. Critical points: - 
, - 1, 
; maximum value - 
; minimum value - 1
D. Critical points: - 1; minimum value - 1
Divide and simplify.
÷ 
A. 
B. 
C. 9x3
D. 
Write the vector v in terms of i and j whose magnitude 
and direction angle ? are given.
= 8, ? = 30°
A. v = 4i + 4
j
B. v = -4
i + 4j
C. v = 4
i + 4j
D. v = 4
i + 4
j
How many seven-digit telephone numbers are possible if the first two digits cannot be twos or zeros? ?
A. 6,400,000 B. 64,000,000 C. 10,000,000 D. 8,000,000 E. 800,000