If 3/x= 4/5, then what is the value of x?

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?

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?