5. the sum of the perimeters of two different equilateral |
triangles is 45 centimeters and the difference between their
perimeters is 15 centimeters. let x equal the side length of
the larger triangle and let a equal the side length of the
smaller triangle. write a system of linear equations that can
be used to find the dimensions of the large and small triangle.

its adding 5.5 each time

step-by-step explanation:

inverse operation of addition

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

question

given the diagram below, what is md?

the sum of the interior angles is 360°

take away from 360 the sum of the knows angles and you will have the angle d.

360 - 108 - 108 - 72 = 72°