Cora drew 2 regular triagles. each side of the first triamgle was 9 centimeters long. each side of the second triangle was 21 centimetrs long. in centimeters what was the difference between the perimeters of the two triangles

First triangle 9x3=27cm
Second triangle 21x3=63cm

Difference = 63-27=36cm

Hope this helps.

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )