Use your calculator to solve the problem.The length of a hypotenuse c of a right triangle with legs a and b of lengths a = 79mm and b = 42mm is given by c = 
. Calculate the length of the hypotenuse. (Round to an appropriate number of significant digits.)
A. 121mm
B. 67mm
C. 89.47mm
D. 89mm
Answer: D
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Solve the problem.A power plant is located on a river that is 650 feet wide. To lay a new cable from the plant to a location in a city 1 mile downstream on the opposite side costs $225 per foot across the river and $150 per foot along the land. Suppose that the cable goes from the plant to a point Q on the opposite side that is x feet from the point P directly opposite the plant. Write a function C(x) that gives the cost of laying the cable in terms of the 
A. C(x) = 225
+ 150(5280 - x)
B. C(x) = 225(650 - x) + 150(1 - x)
C. C(x) = 225
+ 150(1 - x)
D. C(x) = 150
+ 225(5280 - x)
Solve.14 = 14 + m
A. 0 B. 28 C. 1 D. 7
Solve.Which hyperbola is wider? Explain.I) 
- 
= 1 II) 
- 
= 1
What will be an ideal response?
Multiply using a special product formula.(x + 9)2
A. 81x2 + 18x + 81 B. x2 + 18x + 81 C. x + 81 D. x2 + 81