I'm struggling with the questions below:

If the supply curve of a product changes so that sellers are now willing to sell 2 additional units at any given price, the supply curve will

Question 12 options:

A. shift leftward by 2 units.

B. shift rightward by 2 units.

C. shift vertically up by 2 units.

D. shift vertically down by 2 units.

If Qs = -20 + 10p, and Qd = 400 - 20p, what is the equilibrium price?

Question 16 options:

A. 14

B. 42

C. 12.67

D. 38

In the labor market, if the government imposes a minimum wage that is above the

equilibrium wage, then

Question 20 options:

A. workers who wish to work at the minimum wage will have a difficult time finding jobs.

B. firms will hire fewer workers than without the minimum wage law.

C. some workers may lose their jobs as a result.

D. All of the above

Which of the following is NOT a characteristic of perfectly competitive markets?

Question 24 options:

A. The government restricts the number of producers through licensing requirements.

B. All market participants are price-takers.

C. It is easy to find a trading partner.

D. All products are identical.