Alberto and 9 of his friends went out to eat.
1 + 9 = 10
So there are 10 people in total.
Each person paid the same amount, $18.
18 × 10 = 180
The total bill was $180.
Since the perimeter is the sum of the length of all sides we multiply width and length by 2 and then add them together
0.8 i think I’m not sure .