3.268 rounded to the whole number

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

For what value of x does 4x = (1/8) x + 5?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?