Suppose r= {1, 3, 5, 7, 9, 11, 13, 15, 17} and d= {3, 6, 9, 12, 15, 18, 21, 24, 27). what is
rod?
{3, 9, 15)
{1, 5, 7, 11, 13, 17}
{1, 3, 5, 6, 7, 9, 11, 12, 13, 15, 17, 18, 21, 24, 27}
{6, 12, 18, 21, 24, 27}

Answer question above and explain each step : )

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?

How do you solving the solution of each system using elimination?