Question

@jim_thompson5910

Answer 1

So we have
A = x^2
dA/dx =2x

dA = 2x * dx

Answer 2

delta A ~ dA

Answer 3

plug in x = 12 , dx = .1

Answer 4

correct, the error is 2.4 ft^2 , plus or minus

Answer 5

:)

Answer 6

Yeah the error in the area is +-2.4, but I think they just want the magnitude of that error. So just go with 2.4

Answer 7

error is usually stated as a positive magnitude , yes