Brainiest to whoever right plz

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?