A tautology will have an infinite number of solutions, as it is true for all possible values of the variable by definition.
Example: 3(x+2) = 3x+6
All other linear equations in one variable will have one solution, which may include values that are undefined or indeterminate.
Examples:
... 3x-2 = 7 . . . solution is x=3
... x = 0/0 . . . . solution is an indeterminate number
... x = 1/0 . . . . solution is undefined
The volume of a cylinder is equal to 
, where r is the radius of the cylinder and h is its height.
324 =
324 = 
x 3.14 x 
x 1
309.55 =
r = 
r = approx. 17.59 inches
I hope this answer helped you! If you have any questions, feel free to ask away.
A. (Displacement is the distance with direction that means it is a vector quantity. Here we are taking the home to grocery store +5 then grocery store to home -5)
5 - 5 = 0 Here the displacement is zero.
B. Distance is 10 miles
C. Velocity = displacement/time = 0/30 = 0 mile/min
D. Speed = distance/time = 10/30 mile/min = 8.94 m/s
