Find the derivative the function y defined implicitly in term of x.
3xy^3+8x^3y=1

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct

Is 8.50 an answer or no? ?

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction