Here you go, hope I helped.
Answer:
B
Step-by-step explanation:
Pretty obvious Messiur
Answer:
C
Step-by-step explanation:
Becuase it is the number of caleders purchesed times how many calenders

bear in mind that, though the square has two valid roots, one negative and one positive, the hypotenuse is just a radius distance, and therefore is never negative.
The perimeter would be 40 square meters because the area of the square is side times side and the side equals ten so 10+10+10+10=40