Please help! 6th grade question

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint

Evaluate the limit as x approaches 1 of the ((square root of the quantity x squared plus 3 ) minus 2) all over x minus 1. show work

You toss a fair coin 5 times, find the probability distribution of x