Describe the domain of the function of three or more varables.f(x, y, z) = x ln 
A. All points in ?3 that satisfy yz > 0.
B. All points in ?3.
C. All points in ?3 that satisfy yz ? 0.
D. All points in ?3 that satisfy x > 0.
Answer: A
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Which of the following is the best measurement unit to estimate the width of a penny?
A. ?millimeters B. ?centimeters C. ?inches D. ?a dime's width E. ?lined paper
Evaluate the sum.
A. 120 B. 15 C. 60 D. 240
Solve the given differential equation. (The form of yp is given.)D2y - 2Dy - 24y = 4x (Let yp = A + Bx.)
A. y = c1e-4x + c2e6x - 
+ 
x
B. y = c1e-4x + c2e6x - 
x
C. y = c1e4x + c2e-6x + 
- 
x
D. y = c1e-4x + c2e6x + 
- 
x
Solve.In a distant galaxy the gravity of planet A is 216 times as strong as the gravity of planet B, so objects on planet A weigh 216 times as much as they weigh on planet B. If the object weighs 
on planet A, how much does it weigh on plant B?
A. 1540 lb. B. 164 lb. C. 154 lb. D. 147 lb.