Is x = y - 1 a function. I just need a yes or a no please respond the right answer I really need it

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

How do i simply this radical expression?