A variable is just a letter or symbol that symbolizes a number
Therefore, B. 6x is a number multiplied by a letter (product).
Answer:10
Step-by-step explanation:
So originally, let's say the width of Frank's land was

feet.
The area of his land was therefore

, or

, as his land was square.
The width of his land then increased by 3 feet, and the height decreased by 3 feet.
So the new area of Frank's land is:

So the new land is now
9 square feet smaller, so it is not a fair deal for Frank.
Hope this helps :)
Given:
r = radius = 4
h = height = 12
dr = error in radius = 0.2
What we want to find
dV = error in volume
Use the derivative to find the differential dV
V = pi*r^2*h
dV/dr = d/dr[ pi*r^2*h ]
dV/dr = 2pi*r*h
dV = 2pi*r*h*dr
dV = 2pi*4*12*0.2
dV = 19.2pi
So if the error in measuring the radius is +-0.2 inches, then the error in the cylinder volume is +-19.2pi cubic inches (we either measure the volume to be 19.2pi cubic inches too big, or 19.2pi cubic inches too small)
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Final Answer: Plus or minus 19.2pi cubic inches
Note: your teacher may want you to drop the "plus or minus" part
X should equal 100. Hope this helps :)