emeraldhippopotamus898

Why must we stop polluting our water sources/bodies?

Which gives a better measure of the pH: universal pH paper or a pH meter? 

Given last period's forecast of 65, and last period's demand of 62, what it the simple exponential smoothing forecast with an alpha of 0.4 for the next period?

A) 63,2

B) 63,8

C) 68,3

D) 62,3

Kindly explain how you come to the answer.