Add 2.5 to each side
C -2.5 +2.5 =< 2.5+2.5
C=< 5
=< means less or equal
There are 10 cards. They are numbered: 9,10,11,12,13,14,15,16,17,18. One card is randomly picked. What is P(prime number)? 20%,3
arlik [135]
So there are 10 numbers, and 3 of them are prime. Our prime numbers are 11, 13, and 17.
3/10 would be our fraction for this equation, and 3/10 is equal to 30%.
30% is your answer!
