For every 4,000 snowblowers produced by a snow- blower factory, exactly 8 are defective. At this rate,

how many snowblowers were produced during

a period in which exactly 18 snowblowers were

defective?

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?