Is this relation a function{(1,2),(3,5),(6,7),(8,2)}?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

What is the perimeter of an equilateral triangle if each side is (x+3)?

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!