Solve.Combine: 
- 
- 
A. 3x2y + 10xy2 - 6y2
B. 3x2y - 10xy2 - 10xy
C. 3x2y + 10xy2 - 10xy
D. 3x2y + 10xy2 - 10xy - 6y2
Answer: C
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Solve the given differential equation.y(4) - 21y'' - 100y = 0
A. y = C1e2x + C2e-2x + C3 cos 5x + C4 sin 5x B. y = C1e5x + C2e-5x + (C3 + C4x)e2x C. y = C1e5x + C2e-5x + C3 cos 2x + C4 sin 2x D. y = (C1 + C2x)e-5x + C3 cos 2x + C4 sin 2x
Solve the problem.If s varies directly as t2, and 
when 
find s when t is 9.
A. s = 54 B. s = 36 C. s = 486 D. s = 324
Find the slope and the y-intercept of the line.-6x + 9y = 9
A. Slope - 
; y-intercept (0, -1)
B. Slope 
; y-intercept (0, 1)
C. Slope -1; y-intercept (0, 1)
D. Slope 1; y-intercept (0, -1)
What is the domain of f(x)? What is its range?f(x) = 
+ 4
A. Domain: (-?, 4) ? (4, ?); range: (0, ?) B. Domain: (-?, 0) ? (0, ?); range: (4, ?) C. Domain: (-?, 0) ? (0, ?); range: (-4, ?) D. Domain: (-?, 0.6) ? (0.6, ?); range: (-?, 4)