Anyone good at Ks3 maths

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

Find the missing factor. write your answer inexponential form.9^2=9^4×

How can i differentiate this equation?