In a bag containing 3 black balls and 2 red balls , a ball is picked at random then replaced. A second ball is chosen. What is the probability of :

I. both balls being black II. one is black ,the other is red.

2.in a class of 22 boys and 18 girls , two students are to be selected .
What is the probability of selecting two students of the same sex.​

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.