Help me plz, thanks If you do

Find the value of 1715⋅211.though these numbers aren't quite as nice as the ones from the example or the previous part, the procedure is the same, so this is really no more difficult. give the numerator followed by the denominator, separated by a comma.

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Determine which postulate or theorem can be used to prove that lmn =nmo