Tangent (π- α) × cos (-π/2 +α) > 0. the answer is that cos α < 0. i forgot to put the negative sign. how do i solve this? does this method also applies to sen(-π/2-α). i get confused when i see questions like these.

The graph of a line gets what as the value of the slope gets bigger

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

Five dinosaurs go for a walk and come across some lovely chicken wings. their names are rexy, bronto, steggy, paly, and terry. there are exactly 5 dozen wings(equal enough for each dino to have a dozen right? ); however, terry is on a diet and he only eats 6 wings. if paly eats 2 more than terry, steggy eats 4 more than paly, and bronto and rexy eat the same amount because they are really hungry from not eating all day, how many chicken wings did each dino eat?