Which is NOT a right triangle

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

Afarmer has decided to divide his land area in half in order to plant soy and corn. calculate the area of the entire area so he knows how much soil is needed. each bag of soil covers 20 square yards. how many bags should the farmer purchase? (4 points) 1 bag 2 bags 3 bags 4 bags