Find the average value of the function f over the region R.f(x, y) = 
; 1 ? x ? 6, 1 ? y ? 6
A. 
B. 
C. 
D. 
Answer: C
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Use the four-step method in problem solving to solve the problem.City A has an elevation of 3547 feet above sea level while city B has an elevation of 67 feet below sea level. How much higher is City A than City B?
A. 3714 feet B. -3380 feet C. -3480 feet D. 3614 feet
At what points is the given function continuous?f(x, y) = tan (x + y)
A. All (x, y) ? (0, 0)
B. All (x, y) such that x + y ? 
, where n is an integer
C. All (x, y)
D. All (x, y) ? 
Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers.
A. 
B. x14
C. 
D. x15
Solve the problem.The graph shows the amount of money, y, a plumber charges for x hours of work. What is the fixed cost to hire the mechanic?
A. $40 B. $25 C. $70 D. $35