Answer:
4 cm
Step-by-step explanation:
we know that
The scale drawing is

That means ----> 1 cm in the drawing represent 4 ft in the mural
so
To find out the dimensions in the drawing, multiply the actual dimension by the scale drawing factor
so

3x+5=0
3x=0-5
3x=-5
Divide both sides by 3
-1.6666.......
Hope it helps.
As for mod 9, I don't understand.
You get imaginary roots for this equation.
x=4-5i
x=4+5i
Answer:
x=w-z
add x to both sides w=z+x
subtract z from both sides w-z=x