What is the result of adding these two equations?

-4x-2y=-2

X-2y=9

What’s the ratio in simplest form if you count 14 robins out of 150 birds

Write the equation in logarithmic form e^x=403.429

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?