The price of a barrel of oil has been decreased recently. This monthe it is sellingat about $95 per barrel. Last monthe the price was $100 per barrel what is the percent decrease in the price of a barrel of oil from last month to this month?

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Anyone know? will mark brainliest if correct

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)