Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = (x + y)2; -1 ? x ? 1, -1 ? y ? 1
A. 
B. 
C. 
D. 
Answer: D
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Determine whether the quantity is a variable or a constant.The number of roses in a dozen roses
A. variable B. constant
Solve the problem.The table lists the average composite scores on a national entrance exam for selected years.
(i) Make a line graph of the data.(ii) If the graph represents a piecewise-linear function f, find a symbolic representation for the piece of f located on the interval 
A. 
f(x) = 0.75x - 1356.5 if 1982 ? x ? 1986
B. 
f(x) = 4.4x - 8598.1 if 1986 ? x ? 1988
C. 
f(x) = 122.7 if 1986 ? x ? 1988
D. 
f(x) = 131.5 if 1982 ? x ? 1984
Convert as indicated.7.5 L to deciliters
A. 0.75 dl B. 750 dl C. 0.075 dl D. 75 dl
Solve.A certain amount of money saved for 1 year at a certain annual interest rate (simple interest) yielded $6.45 in interest. If we had added $86 to the principal and reduced the interest rate by 2 percentage point(s), the interest would have been the same. Find the principal and the rate.
A. $642.00, 5% B. $8.66, 7.45% C. $129.00, 5% D. $642.00, 3%