50 - 9.20 = 40.80 so 40.80/ 4.25 = 9.6 but you can’t buy .6 of a snack so it’s 9
It is not a true biconditional.
What you are going to do is multiply what you have in parenthesis by two the answer is 2Xsquared and 2Y to the fourth
Using one of the above equations, you can find the value of x.
tan x = 84/13 => x = tan-¹(84/13)
x = 81.20°
Hope that helps