If you roll a fair six sided dies and a four sided dies what is the probability that neither dies shows a one

These question are hard can you me with answers

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=