Answer:
(4, 0.5)
Step-by-step explanation:
l
It would help to know which side is B, can you give a chart?
And I'm on my phone, I can't comment directly on the post, unless someone can tell me how.
I think something wrong
the answer must be 18
<u>Answer:</u>
96
<u>Step-by-step explanation:</u>
Let's assume that the marks needed in the next exam is
. Then if the average becomes 90,

Now we can simply solve for
:
⇒ 
⇒
[Multiplying both sides by 4]
⇒
[Subtracting 264 from both sides]
⇒ 
Therefore, you need to score 96 in your next exam to have an average of 90 on the four exams.