Ineed with the 1st question i dont really understand it

What is the product of the radical expression. (7-2square root) (8+2 square root)

15 points! write the slope-intercept form of the equation of the line through the given point with the given slope. use y-y = m(x-x) to solve. through (2,5) slope= undefined

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?