What's the dimensions of the square

area = 441 cm²

What is the difference between regular convex and concave polygons

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2