Let the full marks be represented by = x
As given, 80% of x is 75
So,

x= 
x=93.75
Hence, full marks is 93.75
We can check also-
=75
Answer:
I think humans live in these places.
Step-by-step explanation:
I think humans live in these places because they are man-made structures made for civilizations, for example the houses and roads.
20 and 10, 20 is 2 times 10 and if you add them together its 30
Answer:
x = - 
Step-by-step explanation:
Radical roots occur in pairs, that is
x =
is a root then so is x = - 
The 3rd one I thinkkkkk ??