Determine the equation of the trend line shown in the scatterplot.
A. y = 
x + 
B. y = 
x + 
C. y = 
x + 
D. y = 
x + 
Answer: C
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Find the potential function f for the field F.F = - 
i + 
j - 
k
A. f(x, y, z) = 
- 
+ 
+ C
B. f(x, y, z) = ln (y - x - z) + C
C. f(x, y, z) = 
+ C
D. f(x, y, z)= ln 
+ C
Use the method of undetermined coefficients to solve the differential equation.y" - 7y' + 10y = ex
A. y = C1e-5x + C2e-2x + 
ex
B. y = C1e-5x + C2e-2x - 
ex
C. y = C1e5x + C2e2x + 
xex
D. y = C1e5x + C2e2x + 
ex
Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 25 pounds of feed worth $0.25 per pound by mixing one kind worth $0.15 per pound with another worth $0.31 per pound. How many pounds of the cheaper kind should they use in the mix? Round your answer to the nearest pound, if necessary.
A. 16 pounds B. 9 pounds C. 11 pounds D. 21 pounds
Solve the problem.Find the equation of a circle with center at (-4, 4), passing through the point 
Write it in center-radius form.
A. (x + 4 )2 + (y - 4)2 = 25 B. (x - 4 )2 + (y + 4 )2 = 5 C. (x - 4 )2 + (y + 4 )2 = 25 D. (x + 4 )2 + (y - 4 )2 = 5