Answer:
3d + 1
I'm pretty sure it's the same thing.
Answer: 
Step-by-step explanation:





18 tens= 180
20 ones= 20
180+20= 200
200
Answer:
252 in²
Step-by-step explanation:
Recall area of regular polygon is A= (1/2)*(perimeter)*(apothem)
Area = (1/2)*(63)*(7)
= 252 in²