x=0.02(1-{e}^{-0.4}))

Question

please explain how to sole ths problem in detail

Answer 1

You should remember the Order of operations: PEMDAS 

Do things in Parentheses First:

                   so 1-e^(-0.04) is first then at the end multiply by 0.02.

Exponents before multiply, divide, and then add and subtract

                    1. exponent: e^(-0.4) in your calculator 0.67032

                    2. No multiplying or dividing

                    3. Add and subtract 1-0.67032 = 0.32968

                    4. Last multiply by what is outside the parentheses...

                        0.0065936