Solve.To determine the tip on a restaurant bill, a patron rounds his bill to the nearest dollar and then calculates 15% of that dollar amount. If the bill came to $24.45, determine the tip that he left.
A. $3.50
B. $3.80
C. $3.70
D. $3.60
Answer: D
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Solve the problem.A swimming pool has a rectangular base 12 ft long and 24 ft wide. The sides are 6 ft high, and the pool is half full of water. How much work will it take to empty the pool by pumping the water out over the top of the pool? Assume that the water weighs 62.4 lb/ft3. Give your answer to the nearest ft ? lb.
A. 161,741 ft ? lb B. 121,306 ft ? lb C. 242,611 ft ? lb D. 323,482 ft ? lb
Calculate the circulation of the field F around the closed curve C.F = xy2i + x2yj; curve C is the counterclockwise path around C1 ? C2 : C1: 
0 ? t ? ?C2: r(t) = ti , -8 ? t ? 8
A. 128 B. 64 C. 0 D. 8
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = -3x + 8y
A. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
c > 0
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
c ? 0
D. Domain: all points in the xy-plane; range: real numbers z ? 0 ; level curves: lines 
c ? 0
Classify the equation as a contradiction, an identity, or a conditional equation.-12s - 18 + 3(4s + 9) = 0
A. Contradiction B. Conditional C. Identity