Explain how to write and solve the equation to solve the problem. bella saved enough money to buy 3 books. if each book cost $13, how much money did bella save?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice