Please answer the complex system

Step-by-step explanation:

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Make the subject for   :

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Add 2y to both sides:  

Divide both sides by i:

To remove i from the denominator, multiply the numerator and denominator by its complex conjugate:

Apply the imaginary number rule   :

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Substitute    into    and make y the subject:

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Apply complex arithmetic rule :

Simplify:

Factor:

Divide both sides by :

Multiply by the complex conjugate to remove from the denominator :

Apply complex arithmetic rule  to numerator:

Apply complex arithmetic rule   to the denominator :

Therefore, one solution is

For the other solution, substitute    into  :

Apply the imaginary number rule   :

Therefore, the second solution is

8.75

how-to:

first, we need to find what we have to work with.

since i know that we have 7 (years) and 0.8 (inches), we can use these to solve and find the equation!

secondly, what you want to do, is see that we need to know how much growth out of the 0.8 inches he got in only 1 year, instead of 7 years.

let's try to divide.

7 ÷ 0.8 = 8.75