Ada has y blue note book and w red notebook .she combined them and was able to see half of the items. how many items did Ada sell?

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota