Anotebook costs 4.50 plus sales tax. after sales tax, the notebook is 4.86. what is the sales tax rate

How many zeros does the function f(x)=4x3-x2+1 have

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?

Can someone tell me if this is perpendicular? !