In elementary school, we learned about opposite operations such as addition and subtraction, and multiplication and division. In both of these cases, one
operation "undoes" the other.

In this course, we'll begin to explore "opposite" function types. For example, think
about a quadratic function and its key features. What key features do you think
its opposite function will have? Why?

answer: 2 and 1

step-by-step explanation: got this question

"if it is my birthday, then it is snowing"

< 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)

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees