Find the partial derivative.Let z = f(x, y) = x3 - 4x2y + 7xy3. Find 
.
A. -4x2 + 7xy2
B. 3x2 - 8xy + 7y3
C. 3x2 - 8x + 7
D. 3x2 - 8xy + 21xy2
Answer: B
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Solve the problem. Round to tenths where necessary.S(x) = -x3 - 45x2 + 525x + 1429, 0 ? x ? 15 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon.
A. 12.5°C B. 5°C C. 0°C D. 10°C
Determine if the given ordered pair is a solution to the equation.-15x - 17y = -83, (1, 4)
A. Yes B. No
Solve the system of equations using substitution.
A. x = 
, y = 
; x = 1, y = 5
or 
, (1, 5)
B. x = - 
, y = 2; x = 1, y = 5
or 
, (1, 5)
C. x = 
, y = 6; x = - 
, y = 
or 
), 
D. x = 
, y = 
; x = - 
, y = 0
or 
, 
Graph the ellipse.4x2 + y2 - 40x + 96 = 0
A. 
B. 
C. 
D. 