What's the difference between p(a|b) and p(b|a) and p(a∩b) ? i really don't get it. explain by using venn diagram so i can understand it better

Ten times the square of a non-zero number is eqaul to ninety times the number

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earned $75 in interest. how much interest will she earn during the following year?