I need help ASAP

I also need to show work

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds.then use the distributive property and mental math to evaluate the expression.