3/7 = 9/x
cross multiply because thats how u solve proportions
(3)(x) = (7)(9)
3x = 63
x = 63/3
x = 21
and if u will notice : 3/7 and 9/21 ....9/21 reduces to 3/7....so these are equivalent fractions...because proportions are nothing but equivalent fractions
6 goes into 23 - 3 times
remainder 5 (3 and 5/6)
Think of dividing by 2 splitting it in half, if you round it you get about 1500 then split that in half. it would be around 750.
The sum of the polynomials will be:
(6s^2t-2st^2)+(4s^2t-3st^2)
=(6s^2t+4s^2t)+(-2st^2-3st^2)
=10s^2t-5st^2
Thus the answer is:10s^2t-5st^2
