1. 8 because 8+8=16+1=17
2. 15 because 15-3=12
3. 5 because 5 times 3 =15 and 5times 2=10+5=15
4. 6 because 6times 2 =12 +2=14. And 6+8=14
5. 10 because 6times 10=60
6. 4 because 4+7=11 and 4times2=8+3=11
The steps matter on the size of the number.
In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far. A plane is the two-dimensional analogue of a point (zero dimensions), a line (one dimension) and three-dimensional space. which would be the same in geo.
No they are not equivalent