Evaluate cot 45° without using a calculator by using ratios in a reference triangle.

Since we are looking for , we must use a  triangle. In a reference triangle, the legs are both , and the hypotenuse is . The function is cotangent, so we are looking for the adjacent side divided by the opposite side of one of the angles. Both the adjacent and the opposite sides are the legs regardless of which angle you choose, so we get , the answer.

I’m not sure what it is i sorry : ((

The discount is 8.70 . you dont tell us the percent of tax added so there is no way to find out, unless i'm not seeing anything. without tax its 37.70