Equivalent expression to x+x+x+x+4-1

How do you solve a question like this?

Human body temperatures have a mean of 98.20° f and a standard deviation of 0.62°. sally's temperature can be described by z = 1.4. what is her temperature? round your answer to the nearest hundredth. 99.07°f 97.33°f 99.60°f 100.45°f

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?