William purchased 76.9 feet of fencing for his back yard. He realized after measuring, that he still needed an additional 25.7 feet of fencing. How many feet of fencing does William need in all?

What is the size of the matrix resulting from

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.