B) When heated an iron bar expands by 0.2%. If the increase in length is 1 cm, what is the original length of the bar ?

Simple algebra.

When we convert this to an equation we get: 0.2% of something is equal to 1 unit.

So here's the equation:

After we transpose , the equation become: .

Divide with and you get .

So the length of the original bar is cm. :D

idn

step-by-step explanation:

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.