Add or subtract by first simplifying each radical and then combining any like radicals. Assume that all variables represent positive numbers.
+ 
A. 77
B. -7
C. 11
D. 11
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at 
B. Domain: all points in the xy-plane satisfying x2 + y2 ? 9; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
C. Domain: all points in the xy-plane satisfying x2 + y2 = 9; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
D. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
Solve the problem.The cost of a tourist package depends on the number of sightseeing stops that you choose. You have been informed that 2 stops cost $160, and 5 stops cost $235.(i) Write a linear equation giving the cost, y, in terms of the number of stops x.(ii) Using the equation found in part a, find how much it costs for 4 stops.(iii) How many stops would there be if the cost is $385?
A. (i) y = 25x + 110 (ii) $210 (iii) 13 stops B. (i) y = 25x + 110 (ii) $210 (iii) 12 stops C. (i) y = 25x + 110 (ii) $210 (iii) 11 stops D. (i) y = 25x + 110 (ii) $210 (iii) 10 stops
Factor the trinomial.x2 + 17x + 72
A. (x - 8)(x - 9) B. (x + 8)(x + 9) C. (x + 72)(x + 1) D. (x - 8)(x + 9)
For the measured quantity, state the set of numbers that is most appropriate to describe it. Choose from the natural numbers, integers, or rational numbers.Populations of cities
A. Rational numbers B. Natural numbers C. Integers