If triangle abc is congruent to triangle xyz, then which of the following is congruent to ∠a?

Solve the equation by completing the square. x^2+2x=17

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?

8.74 rounded to the nearest whole number