Find the second-order partial derivative.Find fxy when f(x,y) = 10x2y4 - 7x3y5.
A. 80xy3 - 21x2y4
B. 160xy3 - 105x2y4
C. 80xy3 - 105x2y4
D. 160xy3 - 21x2y4
Answer: C
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Animal type A and animal Type B compete for the same resources. Suppose there are a animals of type A and b animals of type B. Both a and b are measured in thousands. Then the growth rates of the two types of animals are given by
Growth rate for Type A: 
Growth rate for Type B: 
A: Equilibrium occurs when both growth rates are 0. Find two expressions of ?b in terms of ?a when equilibrium occurs. Round your answers to two decimal places, if necessary.B: Plot the graphs of ?b versus ?a for both the expressions you found in part A. Be sure your graph shows the crossing point.C: How many of each type of animal is present when equilibrium occurs? Round your answers to two decimal places, if necessary.
What will be an ideal response?
Solve.Find the volume generated when the shaded region is revolved about the y-axis.
A. 28 - 7?
B. 7? + 7?2
C. 14? - 
?2
D. 28? - 7?2
Find the volume area of the figure. Use 3.14 for ?. Round the answer to the nearest hundredth when appropriate.
A. 226.08 cu. ft B. 452.16 cu. ft C. 113.04 cu. ft D. 1808.64 cu. ft
Graph the polynomial function. Factor first if the expression is not in factored form.f(x) = x3 +5x2 + 7x + 3
A. 
B. 
C. 
D. 