70000- ten thousand
8000- thousand
000- hundred
00- tens
0- ones
so look at the 7 and if the number on the right is more than 4 you give the ten thousand a new number ; 80000
hope i helped
2x -7=13 is an equation because it has an equal sign.
When you solve the following equation, solving for the quadratic formula.
The answer is; x=4
Next time pay attention in class.