Answer:
7
Step-by-step explanation:
9v - 8(10v - 9) = 9v - 80v + 72 = <u>-7</u><u>1</u><u>v </u><u>+</u><u> </u><u>7</u><u>2</u>
True
brainliest
cos 300° = cos 60° = 0.5