Find the x of 3x+2y=-9 but substitute the y to 2x+13

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?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn