My teacher said this is all due TODAY I need help ASAP please

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

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Write the equations in logarithmic form 9^4=6,561