Help me please and thx

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?