Tangent (π- α) × cos (π/2 +α) > 0. the answer is that cos α < 0. can someone explain why?

Anyone know? is appreciated! will mark brainliest if correct!

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?