Ricardo has 898 sports cards. There are 15 more than three times as many football cards as basketball cards. Write a system of equations that can be used to determine the number of football cards, f, and basketball cards, b.

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?