Can someone explain to me how to do this and what type of math is this

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Agroup of randomly selected members of the foodies food club were asked to pick their favorite type of food. the bar graph below shows the results of the survey. there are 244 members in the foodies.