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. 89mm
B. 121mm
C. 89.47mm
D. 67mm
Answer: A
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Find the sum of the n terms of the indicated arithmetic sequence.-1, - 
, -2, . . . ; n = 10
A. -32.5 B. -37.5 C. 17.5 D. -35
Write the equation of a line that passes through the given point and is parallel to the given line. Write the equation in slope-intercept form.(-2, -1); y = - 
x - 7
A. y = - 
x + 
B. y = 4x - 7
C. y = 4x + 7
D. y = - 
x - 
Determine what m and b represent.The cost, in dollars, of retaining the services of a computer repairman in Anchorville is given by 
where x is the number of hours worked.
A. 18 signifies the hourly rate, and 51 signifies the overhead charge. B. -51 signifies the hourly rate, and 18 signifies the travel cost. C. 69 signifies the cost for an on-site inspection. D. 51 signifies the hourly rate, and 18 signifies the overhead charge.
Provide an appropriate response.What is 78 decreased by 21?
A. 99 B. 137 C. 57 D. 55