3n+4=-5
do the opposite of adding 4. this means you have to subtract 4 from 4. whatever you do to the problem, you must do to the answer. now subtract 4 from -5.
-5-4=-9
since 4-4=0, we can take 4 out of the equation. now you have:
3n=-9
now divide -9 by 3
-9/3=-3
n=-3
hope this helps :)
Answer:

Step-by-step explanation:
The area of a triangle is given by:

From the diagram 
We substitute into the formula to get:

This implies that:

it is 56
because you need to break the figure into two parts
5 x 4 = 20
4 x 9 = 36
whats the question? ill help you out i just wanna Answer the right question