Answer:
14
Step-by-step explanation:
If he had 14 then he gave away 6, he'd have 8. 8 plus 4 is 12. He had 14 before giving any away.
You use the formula given and it usually involves dividing
The area of D is given by:

The average value of f over D is given by:
Answer:
(-3+√17 )/2. or( -3-√17)/2
hope you got it