Jacob has $1.20 worth of nickels and dimes. He has twice as many nickels as dimes. Graphically solve a system of equations in order to determine the number of nickels, and the number of dimes , y, that Jacob has .

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?