Last week, ethan finished 3 1⁄5 books, but this week he only finished 1 4⁄5 books. how many more books did he read last week?

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?

How do you write y-10=2 (x-8) in standard form

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.