18 ÷ 7 pls help me someone

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)