You must first attach the problems with your question.

that is, hypotenuse.
Therefore, let the length of the hypotenuse be 'x.'

625+3600=

4225=

Therefore,

=x
65=x
The length of the hypotenuse is B.65 centimetres.
Yes they are both like terms so if they are in the same equation you can just add them together.
Since there is no number for the number of pounds for the polar bear, you would use p to represent polar bears. The expression would be: 1578 - p. Good luck