Answer 8-9 and show work please

8 A ball is launched upward at a speed of 20 meters per second (m/s) from a 60-meter tall platform. The equation for the ball's height (h in meters) at time t seconds after launch is h = -4.9t2 + 20t + 60. What is the maximum height of the ball? Include units of measurement and round to the nearest hundredth. 9 A rectangle and a square have the same area. The length of the rectangle is 70 feet more than two times its width. The length of a side of the square is 30 feet. Set up an equation to find the dimensions of the rectangle. What are the dimensions of the rectangle? Include units of measurement. C Apply Your Knowledge (See Ex. 7) 10 A factory produces lemon-scented widgets. Each widget is cheaper, the more that are produced, but costs will go up if too many widgets are produced, due to storage requirements. The accountant for the factory says that the costs for producing x thousands of units a day can be approximated by the formula C = 0.04x2 - 8.504x + 25302. Find the daily production level that will minimize the costs. Be sure to show your work and include units of measurement