Write a formula for the nth term of the geometric sequence.4, 
, 
, 
, 
, . . .
A. an = 4 
n - 1
B. an = 4 
n + 1
C. an = 4 
n
D. an = 4 
n - 1
Answer: A
Mathematics
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Perform the indicated operations and write the result in standard form.(-9 - 
)2
A. 81 + 25i B. 106 - 90i C. 81 - 25i D. 56 + 90i
Mathematics
Tell where the function is decreasing.
?
?
?
?
A. always decreasing
B. 
C. 
D. always increasing
E. always constant
Mathematics
Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 60 ft and the vertical clearance must be 30 ft at a point 9 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Simplify the expression.3y(xy + y) - 6y2(x - 4 + 2y) + 2(y3 + y2)
A. - 3xy2 + 27y2 + 26y3 B. - 3xy2 + 29y2 - 10y3 C. 9xy2 + 27y2 - 10y3 D. 3xy2 + 27y2 - 26y3 E. none of these
Mathematics