A zoo is building a new giraffe exhibit and needs to fence an outdoor triangular area, with the barn forming one side of the triangle. The maintenance department has only 128ft of fencing in stock. If one of the sides of outdoor pen is 77ft and angle makes with barn is 72 degrees, does the zoo need to order more fencing?

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

he has 140 chickens because he has 10 times more chickens than ducks and he has 14 ducks so 14*10=140