Find the indicated function.A parking lot measures 160 by 210 feet including a sidewalk of uniform width around its perimeter. Let x represent the width of the sidewalk. What is a function to represent the area of the sidewalk?
A. A(x) = x(420 + 2(2x - 160))
B. A(x) = x(3 + (160 - x))
C. A(x) = x(420 + 2(160 - 2x))
D. A(x) = x(420 + 2(160 - x))
Answer: C
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Suppose the triangles shown are similar, with angle A = angle D, angle B = angle E, and angle C = angle F. Answer the question.
What is the length of side DF?
A. 76 B. 22 C. 54 D. 30
Multiply and simplify.
? 
A. - 
B. 
C. 
D. -12
Evaluate the series, if it converges.- 
+ 
- 
+ 
+ ...
A. - 
B. Does not converge
C. - 
D. - 
If the total revenue function for a toy is 
dollars and the total cost function is 
dollars. What is the instantaneous rate of change of profit if 10 units are produced and sold? Explain its meaning.
? A. 0.20. Selling an additional unit when 10 have been sold increases profit by $0.20. B. 0.60. Selling an additional unit when 10 have been sold increases profit by $0.60. C. 6.80. Selling an additional unit when 10 have been sold increases profit by $6.80. D. 7.00. Selling an additional unit when 10 have been sold increases profit by $7.00. E. 234.00. Selling an additional unit when 10 have been sold increases profit by $234.00.