Because if X is ten then the equation is complete
Answer:
The biggest - the smallest
612-120=492
An example would be:
Standard:12345678
Expanded: 10000000+2000000+300000+40000+5000+600+70+8
Word: twelve million three hundred forty-five thousand six hundred seventy-eight
Answer:
See image
Isosceles triangles have 2 congruent base angles