Check the picture below.
let's recall that 2π is a full go-around or namely a revolution

Darnel needs to spend three days making jam if he wants to jar 15 liters.
Step-by-step explanation:
If you are to assume the relationship is proportional then if he makes 10 liters in 2 days you divide 10 by 2 and you get 5. This means he makes 5 liters a day. Then you add 5 to 10 and you get 15 which means you are adding another day(5) So he needs to work an extra day which would give you three dyas total. Hope this helped!
The answer & explanation for this question is given in the attachment below.
The value of 47-36÷3(5+7-3²) is 11.