Answer:

Step-by-step explanation:
Given equation is
………………(1)
we use derivative formula 


And also apply 'u v' formula

Differentiating equation (1) partially with respective to 'x' , we treated 'y' as constant.
( here y treated as constant so the derivative of constant function is zero in addition but in multiplication the constant is keep as like 'y').
on simplification , we get

again simplification, we get

taking common '
on left on side , we get

dividing '
on both sides, we get

<u>Final answer</u>:-

since it is a quadrilateral, all the sides will add to 360. If two angles are 90, and one is 99, add them and subtract from 360. The last angle should be 81 degrees.
So hope it goes well but the answer is 11
A rational number is one that u can turn into a fraction.
Anytime u have a whole number and u want to turn it into a rational number, put it over 1.
7 to a rational number would be 7/1