plz answer all the questions

Question 5 1 pts If firms and workers could predict the future price level exactly, the short-run aggregate supply curve would be O upward sloping. O downward sloping. O horizontal. O vertical.Question 6 1 pts Which of the following would cause the short-run aggregate supply curve to shift to the left? O an increase in the price level O an increase in inflation expectations O a technological advance O a decrease in interest ratesQuestion 3' 1 pts 1Which of the following is one of the most important benets of money in an economy? {3 Money allows for the exchange of goods and services. C} Money encourages people to produce all of their own goods [selfvsutflciency] and therefore increases economic stability. C} Money allows for the accumulation of wealth. C} Money makes exchange easier, leading to more specialization and higher productivity. Question 8 1 pts Dollar bills in the modern economy serve as money because O they can be redeemed for gold by the central bank. people have confidence that others will accept them as money. they have value as a commodity independent of their use as money. O they are backed by the gold stored in the central bank