I REALLY need help on these problems. Please help me

6-15. A stick 4 feet tall casts a shadow 5 feet long at 6:36 p.m. How tall is a pole that casts a shadow 32 feet long at the same time? 6-16. The amount of water evaporating from a conical container varies directly with the exposed surface area (circular region) of the water in the cone. The height of the cone is 10 meters 3,m when full. When the height of the water is 5 meters, the radius 10m of the exposed circular region is 3 meters. At this point, water 5m is evaporating at a rate of 0.2 liters per hour. a. How fast is the water evaporating when the container is full? b. How fast is the water evaporating when it is half full? (Reminder V = Larzh.) 6-17. Let g(x) = x2 -2x. Find g(-1), 8(3), g(a) , and g(t - 2). 6-18. Solve each equation for x. X X a. = 3 b. + x- 1 x2-x x2-25 x+5