HELP? How do you prove that a line parallel to one side of a triangle divides the other two sides proportionally and converse (triangle proportionality theorem)

Three children each had the same amount of money in their savings account. one of the children withdrew three quarters of her moneyand spent it all on a $100 sports jersey. what was the total amount of money originally in the accounts?

Rewrite the following without an exponent. (5/8)-1

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.