You have seven cards, numbered 3 through 9, and you pick one at random. if you pick a card with a prime number, you get 1 point; if you pick a card with a composite number, you lose 1 point. find the expected value of the number of points you get.

He has number of points

Step-by-step explanation:

We have given that numbers from 3 to 9

So numbers will be 3,4,5,6,7,8,9

Here prime numbers are 3,5,7

And composite numbers are 4,6,8,9

So probability of getting prime number =

And probability of getting composite number

It is given that if he gets prime number then he get 1 point and if he get composite number then he loss 1 point '

So value of number of point he has =

x/7.50 = 15

x= 7.50 / 15 divide

step-by-step explanation:

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)