Pls help i really really need it!! i'm really tiered and would appreciate your help. :) thanks.:)

solve for 5 a and b

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

What is the solution of the systems of equations? y=2/3x+3 x=-2

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books