This is best done using a Venn Diagram.
Given:
Probability that he gets into NYPD is 0.60
Probability that he gets into CSI is 0.70
Probability that he gets into both is 0.40
Probability that he gets into ONLY NYPD? 0.60 - 0.40 = 0.20
Probability that he gets into ONLY CSI? 0.70 - 0.40 = 0.30
2? bc if x=7 then it equals 2(7) which is 14 sooo i believe either 7 or 2
Answer:

See the proof below
Step-by-step explanation:
if
, then : 
We can then apply the derivative to both sides of this last equation and remember to use the chain rule as we encounter the variable "y":
