How to find the intersection of a plane ?

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are: