I have no idea what this is

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

What is the best reason for jacinta to have a savings account in addition to a checking account

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]