The answer is x=20.  Hope this helps.
        
             
        
        
        
2 - b.
3 - a.
I'm not sure about 4. Hope this helps!
        
             
        
        
        
5/6 of an hour is 50 min. So 50 times 3 equals 150 min for reading. 3/4 of an hour is 45 min. 45 times 2 equals 90 min for science. And 1/2 of an hour is 30 min. So 30 times 4 equals 120 mins for math. Add 150,90, and 120 min all together and you get 360 mins total. Divide 360 by 60, and you get 6 hours total that Michaela spent on reading, math, and science. Not 2 1/2.
        
             
        
        
        
Answer:
14n 
Step-by-step explanation:
just rearrange the number with the variable