6. A small rocket is launched from a height of 72 feet. The height of the rocket in feet, h, is represented by the equation 2( )166472h ttt , where t = time, inseconds. Find (a) how many seconds until the rocket reaches its maximum height, and (b) how many feet high it will be at that point.7. The height of a golf ball hit into the air is modeled by the equation 21696htt where h represents the height, in feet, and t represents the number of seconds that have passed since the ball was hit. (a) How many seconds until the ball reaches its maximum height? (b) What is its maximum height?

8. An architect is designing a museum entranceway in the shape of a parabolic arch represented by the equation , where 0 ≤ x ≤ 20 and all dimensions are expressed in feet. Determine its maximum height, in feet.

9. You may use the TABLE function on your calculator for the following problem:Worksheet #10-10Use the center and radius to graph each circle.1. x2+ y2= 49

Center: ______________Radius: ______________2. (x – 7)2+ (y + 2)2= 16Center: ______________Radius: ______________3. (x + 1)2+ (y – 2)2= 81Center: ______________Radius: ______________Worksheet #10-12

Solve each system by graphing.1.221002xyyx 2.222491xyy

2

Worksheet #10-13Solve algebraically to find the points of intersection.1. 2213yxxyx 2. 2642yxxyx

3. 21424yxyx 4. 2413yxxyx 5. 242yxyx