instruction:
Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
question:
Problem: a ( 3, w ^ 3 ) is the ( x, y ) coordinate of point located on the parabola y = x ^ 2 - 1. what is the value of w ?
Options: a. 2., b. 4., c. 5., d. 6., e. 9.
answer:
a


question:
Problem: for the past n days, the average ( arithmetic mean ) daily production at a company was 50 units. if today ' s production of 110 units raises the average to 55 units per day, what is the value of n ?
Options: a. 9, b. 11, c. 13, d. 15, e. 17
answer:
b


question:
Problem: in 7 given numbers, the average of first 4 numbers is 4 and that of last 4 numbers is also 4. if the average of these 7 numbers is 3, the fourth number is ?
Options: a. 3, b. 4, c. 7, d. 11, e. 12
answer:

d