Which function represents the sequence -5.5, -4.75 -4,-3.25... ?

Wrote and expression for the difference of p and 4

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.