Could I have a step-by-step as well

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?

Benjamin believes that ¼ % is equivalent to 25%. is he correct? why or why not?

Oliver makes blueberry jam every year. the number of kinds of jam he makes this year can be represented by the expression 4p -9, where p is the number of pints he made last year