The lowest value in the range of the acceptable lengths of the rod is that which is 0.015 cm shorter than the ideal. The highest value in the range is that which is 0.015 cm longer than the ideal. From the given, the ideal length is 30.5 cm. Thus, the answer is 30.485 cm to 30.30.515 cm.
3/4 x 4/1 = 12/4 simplified to make the denominato to be a 1 so you divide both the numerator, which is 12, and the denominator, which is 4, by 4 so you end up with 3/1 which is 3 cups.
