A quadratic equation has exactly one real number solution. which is the value of its discriminant

Could someone with number 1 and 2

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.