Bria invests $900 in one account and $1000 in an account paying 2 % higher interest. At the end of one year she had earned $210 in interest. At what rates did she invest?

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.