Need help understand the first T/F question and the last T/F question

Question 22 Determine whether each of the following statements about the ADAS model is true or Else. An elimination of import tariffs will euase the AD curve shifts to the right. Holding all else constant1 there will be a leftward shift in the SEAS curve when labour unions successfully negotiate an increase in nominal wage for their workers. An improvement in total factor productivity will onlyF shi the SEAS curve to the right. The AD curve is downward sloping because when the aggregate price level increases, people decide to buy fewer units of relatively more expensive goods and more units of relative inexpensive goods