105,159 rounded to the nearest ten thousand

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).