Katie wants to buy 6 pencils from the school store. each pencil costs 15¢.how much money will she get back if she pays with a five dollar bill?

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

The function models the number of accidents per 50 million miles driven as a function