4. A semicircular rug is 35 inches in diameter. What is the perimeter? If a tassel is attached every 1.5 inches, how many tassels are there?
5. A circular mirror is 21 inches in diameter. It has a 1-inch wide wooden frame. You want to cover
the outer edge of the frame with a copper strip. How many inches of copper do you need?

Amodel airplane is shot up from a platform 1 foot above the ground with an initial upward velocity of 56 feet per second. the height of the airplane above ground after t seconds is given by the equation , where h is the height of the airplane in feet and t is the time in seconds after it is launched. approximately how long does it take the airplane to reach its maximum height?