Ok so on the first draw, 6/24 marbles are likely to be blue so there is 1/4 chance of obtaining blue originally. But, she puts it back and again it's 1/4 of obtaining the blue again. So 1/4 X1/4 = 1/16.
Well the slope formula is y² - y¹ / x² - x¹.
If there was a picture I could help!
Cashier at target would be the best option
Weekly check would get you $173.25
Monthly would get you $693
Yearly would get you $8316
Hope this helps