Mikah invented and patented a new product which sells in local department stores. this is an example of income.

Correct answer is Passive income

Mikah invented and patented a new product which sells in local department stores. This is an example of PASSIVE income.

Passive income can be defined as that money which is earned with minimum  activity and require little daily effort on the individual's part. Like here in the question, Mikah invented and patented his own product. Other ideas of passive income include like- creating your app, designing t shirts etc.

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)