Find gcf of 14m2n2, 18mn and 2m^2n^3

2mn

2mn^2

2m^2n^3

mn

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?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?