I need help with the question please! I'm having a hard time answering it!

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.

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?