How do you solve -b -2 > 8 step by step?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%

Simplify each expression. use positive exponents. show work . (x –2 y –4 x 3 ) –2

This question is hard for me to answer can you me. the question is find the value of x.