PLEASE HELP!!!

what is the value of the expression 2/5m−1/3 when m = 3?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.