Answer:
15 cm
Step-by-step explanation:
The area of an equilateral triangle is:
, where a is the length of one side.
We can find the value of a (the length) by:


a = 5, so the side length of this triangle is 5 cm.
The perimeter of an equilateral triangle will be 3 times the length.

Hope this helped!
The answer would be the top left one because when dividing, you would subtract 8 from 13. I'm pretty sure not 100% though. Sorry.
Answer:
She made an error in step 1.
Step-by-step explanation:
Answer:
2. 4th degree polynomial
Step-by-step explanation:
The degree is the highest exponent in the expression. Since the highest exponent is 4, this is a 4th degree polynomial.
The answer is -1.1
Hope you get it right