Simplify the expression. Assume that all variables are positive when they appear.
A. 7xy
B. 7xy
C. 2xy
D. 7xy
Answer: A
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Solve the problem.The Van der Waals equation provides an approximate model for the behavior of real gases. The equation is P(V, T) = 
- 
, where P is pressure, V is volume, T is Kelvin temperature, and a,b , and R are constants. Find the partial derivative of the function with respect to each variable.
A. PV = 
- 
; PT = 
B. PV = 
- 
; PT = 
C. PV = 
; PT = 
- 
D. PV = - 
+ 
; PT = 
Reverse the order of integration and then evaluate the integral.
A. ln 5 - 1
B. 
C. ln 5
D. 
Solve the problem.Junior high classes of 25 students each met in the cafeteria to take achievement tests. If exactly 8 students sat at each table and 25 tables were used, how many classes took the tests?
A. 10 classes B. 8 classes C. 11 classes D. 21 classes
Determine whether the graph is that of a function. If it is, use the graph to find its domain and range, the intercepts, if any, and any symmetry with respect to the x-axis, the y-axis, or the origin.
A. function domain: all real numbers range: {y|y ? 9} intercepts: (0, -2), (8, 0), (0, 4) symmetry: none B. function domain: all real numbers range: {y|y ? 9} intercepts: (-2, 0), (0, 8), (4, 0) symmetry: none C. function domain: {x|x ? 9} range: all real numbers intercepts: (-2, 0), (0, 8), (4, 0) symmetry: y-axis D. not a function