No,
although all the sides are the same length on an equilateral triangle the height is calculated by a straight perpendicular line at the mid point of the base.
The sides are not perpendicular with the base and are angled outwards
Answer:
<h2>(5x+4)(x-1)</h2>
Step-by-step explanation:

Nope, <span>5r + r3s is not a monomial.
Monomials cannot include addition or subtraction, and since this uses addition, it is not a monomial.
</span>
I hope this helps and have a great day! If you need anymore help you can link me to another question and I will try to solve it!