7m+4n-m+n
17+2(6-3)-3×4
What is a integer
a+2b-3c-4a-b+2c
-3(2x+1)=21
9k+4x-4x+3k
What is 2 into 23
P is a point (2,9) and Q is point (4,6). find the length of PQ, the equation of the line PQ
what algebraic equation does 9 1 6 4 have