If we denote the length of each side as $\mathrm{l}$ and $\mathrm{b}$ and perimeter as $\mathrm{p}$, how do we write the relation between $\mathrm{p}, \mathrm{l}$ and $\mathrm{b}$?

Write the given operation in ordinary language and then write it as algebraic expression using letters. Check whether it's a general principle or not.

'Add to a number, two more than the number.'

Write the given operation in ordinary language and then write it as algebraic expression using letters. Check whether it's a general principle or not.

'Add one to a number and subtract two'.

Write the given operation in ordinary language and then write it as algebraic expression using letters. Check whether it's a general principle or not.

'From a number subtract another and then add twice the subtracted number.'

Write the given operation in ordinary language and then write it as algebraic expression using letters. Check whether it's a general principle or not.

'Add to a number the double of itself'.

Write the given operation as algebraic expression using letters and check whether it forms a general principle.

'Add two consecutive natural numbers and find the number, one less than this'.

Write the given operation as algebraic expression using letters and check whether it forms a general principle.

'Add two consecutive odd numbers and subtract the even number in their middle'.

Write the given operation as algebraic expression using letters and check whether it forms a general principle.

'To a number, add another and subtract the first'.