I need help with these 3 problems please, and please provide very detailed explanations as well.

Find the open intervals on which the function f (@) = a + 10\\/8 - x is increasing or decreasing. If the function is never increasing or decreasing, enter NA in the associated response area. increasing: decreasing:2 Usirg calculus, find the absolute maximum and absolute minimum of the function f (at) = 6:1: 363: + 3 on the interval [41,5]. absolute maximum 2 I I n . absolute minimum = I I n - \f