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
(23+15x) when you add this you will have your answer
Answer:
for number 31 it is 06,08 and 14 for 31 a
Step-by-step explanation:
Ok so the first one is
1.x=135
2.x=-23
3.x=3
4.x=70
Answer
63.2 degrees
Step-by-step explanation:
Using law of cosines: 19^2=8^2+14^2-2(8)(14) cos (x)
361=64+196-224 cos(x)
361=260-224cos(x)
101=224cos(x)
divide both sides by 224, which gets you (rounded to 4th decimal place) 0.4509. do inverse cos which gets you 63.2