There are 30 books and there are 5 paragraghs in each chapter. divide 30,5 what does it give you

Find the quotient. 50a2 – 98b2 -5a +7b

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.