Use the equation 1.6 divided n =0.016?

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.

Jorge planted flowers in his garden he planted one row of 12 tulips and one row of 36 daisies george's friend kylie has a garden with 75 flowers in it kylie's garden only contains tulips and daisies. is it possible for kylie‘s garden she have the same ratio of tulips to daisies as george's garden?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?