Answer:
3x=20
Step-by-step explanation:
Perimeter is just all the sides of a shape added. So, x+x+x=20 or, more simply put, 3x=20.
Standard form is of course 17,497,403.
Expanded form is:
10,000,000 + 7,000,000 + 400,000 + 90,000 + 7,000 + 400 + 3