How would I find this? Would I do 90- # or?

In a triangle, all the angles add up to 180 degrees. The square in the bottom left of the triangle shows that it is a right angle or 90 degrees. So you have two angles and you subtract them both from 180.

180-42-90=48

So your answer is 48 degrees.

- "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."

just pick what you think i need more time let me know if this

step-by-step explanation: