Need Both answer with calculation and Explanation

10. Suppose that to make an ice cream sundae, you are allowed to pick one flavor of ice cream, one sauce, and one topping. If there are 4 ice cream flavors, 3 sauces, and 7 toppings available, how many different sundaes could you make? 11. A Social Security number is used to identify each resident of the United States uniquely. The number is of the form xxx-xx-xxxx where each x is a digit from 0 to 9. How many social security numbers are possible