Can someone please help me out

Draw a tape diagram to represent each situation. for some of the situations, you need to decide what to represent with a variable andre bakes 9 pans of brownies. he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.