Cos A=sqr rt 2/3 find the exact value of side a

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.