Answer:
Step-by-step explanation:
The formula of the area of a triangle is . Plugging in the given base and height values, you get . Hope this helps!
(4x+1)= 81
4x+1= 81
4x= 81 - 1
4x= 80
x= 80/4
x= 20
<u>Fraction:</u>
<u>Decimal:</u>
Step-by-step on how to solve it is in the picture below.
Hope this helps! :)