Find a formula for an ?for the arithmetic sequence.
?
16, 11, 6, 1, -4, ...
?
A. an ?= 1 - 5n
B. an ?= 1 + 5n
C. an ?= -5n + ?21
D. an ?= 5n - 21
E. an ?= 5n + 21
Answer: C
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Fill in the blank.The opposite of -24 = 
.
A. 
B. 24
C. -24
D. 0
Determine whether the graph of the equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.y = 5x
A. origin B. y-axis C. x-axis D. x-axis, y-axis, origin E. none
Convert the rectangular equation to a polar equation that expresses r in terms of ?.8x - 9y + 1 = 0
A. 8 cos ? - 9 sin ? = -1
B. 8 cos ? - 9 sin ? = 1
C. r = 
D. r = 
Solve the problem.A building contractor is to dig a foundation 45 feet long, 16 feet wide, and 9 feet deep. The contractor pays $11 per load for trucks to remove the dirt. Each truckload holds 4 cubic yards. What is the cost to the contractor to have all the dirt hauled away?
A. $17,820 B. $2640 C. $660 D. $60