The annual salaries of all employees at a financial company are normally distributed with the mean =34000 and a standard deviation =4000 what is the z-score of a company employee who makes an annual salary of 28000? -5 -3.5 -1.5 1.5

I’m stuck on this equation, anyone got the answer?

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove