30 POINTS PLS HELP ASAP! AND ANSWER EACH ONE

1. a square bulletin board has an area of 100ft^2

what is the side length of the bulletin board? ft

what is the perimeter of the bulletin board? ft

2.which is the correct classification of the vaule 2pi?
A. real, rational, integer
B. real, rational
C. irrational, integer
D. real, irrational

3. simplify each expression
-9x +12 - 10 + x
3/4x + 17 - 1/4x - 19
13 + 12x - 4x - 14
-3/2x - 68 + 2x + 8

brainlist will be added if explation if but down for each *not required tho*