Can someone help me with finding the gradient of lines a and b (year 9 maths watch work)

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition? a) 6 b) 8 c) 14 d) 20

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Jonah runs 3/5 miles on sunday and 7/10 mile on monday. he uses the model to find that he can ran a total of 1 mile . what mistake does jonah make