Find an for the given geometric sequence.a1 = 2, r = -2
A. an = -2(2)n-1
B. an = 2(-2)n
C. an = 2(-2)n-1
D. an = -2(2)n
Answer: C
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Solve the problem.A rectangular sheet of perimeter 39 cm and dimensions x cm by y cm is to be rolled into a cylinder as shown in part (a) of the figure. What values of x and y give the largest volume?
A. x = 14 cm; y = 
cm
B. x = 12 cm; y = 
cm
C. x = 13 cm; y = 
cm
D. x = 15 cm; y = 
cm
Solve the problem.For what value of a is the volume of the tetrahedron formed by the coordinate planes and the plane 
equal to 6?
A. a = 2
B. a = 4
C. a = 3
D. a = 
Read and solve the following problem. Then write a paragraph describing the method you used to get your solutions.Which problem solving strategies did you use and why?
The heptagonal numbers are the whole numbers that represent the following shapes.
Find the number of dots in the nth heptagonal number.
Find an equivalent equation in rectangular coordinates.r = 
A. 6x + 4y = 5
B. 6y + 4x = 5
C. 6x - 4y = 25
D. 6y + 4x = 