Find the distance between the points (7/3,2) and (1/3,-1)

Which of the following are accepted without proof in a logical system? check all that apply.

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

What must be done to each side of the equation to find the value of n? 4/5 n = 20 a) divide by 5/4 b) divide by 4/5 c) multiply by 5/4 d) multiply by 4/5