Answer:
1.46
Step-by-step explanation:
First find the the mean score before he made a 90.

Now add the score of 90 and calculate.

Subtract the two scores.

His mean test score increased by 1.46.
Answer:
18
It’s literally 72 divided by 4 which equals 18
Answer:
tanx + cotx = 
Step-by-step explanation:
<u><em>Explanation</em></u>
Take R.H.S = 
= 
= 
= 
= tanx + cotx
tanx + cotx = 
48 is greater than or equal too 40in I think so < with a little line under it