Ihad 28 tests to mark and finished 54%. how many do i have left

52 tests because you would multiply 28 by 100 then divide by 54. You would get 51.851, but you cannot have and 8th of a test, so you would round up

look a the sides they are perpendicular

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.