In the triangle abc the measure of angle a is 2x +3 the measure of angle b is 4x +2 in the measure of angle c is 2x -1what are the measures of the angles

I'm so close to finishing all these.

At which value in the domain does f(x) =0?

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?