Can you find the sum of (-6y-2)+5(3+2.5y) ?

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

X+ y = 5 ; x - y =3 solve using linear combination

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol