Write down a formula for the perimeter of the shape

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?