PLEASE HELP M Can someone teach me the law of cosigns in geometry? and like explain it so i can understand it? Please it would mean so much to me!

Simplify. 3(4+4x) (type your answer in with no spaces)

Round each decimal to the nearest thousandth. a. 5.39562 b. 0.12345 c. 5634 d. 18.93763

Convert the number to decimal form. 12) 312five a) 82 b) 30 c) 410 d) 1560 13) 156eight a) 880 b) 96 c) 164 d) 110 14) 6715eight a) 53,720 b) 3533 c) 117 d) 152