Alocal hamburger shop sold a combined total of 498 hamburgers and cheeseburgers on tuesday. there were 52 fewer cheeseburgers sold than hamburgers.

275 hamburgers and 223 cheeseburgers were sold on Tuesday.

Solution:

Assume hamburgers as H and cheeseburgers as C,

From the given,

Total number of hamburgers and cheeseburgers sold on Tuesday is 498 i.e.

There were 52 fewer cheeseburgers sold than hamburgers i.e.

On substituting (1) in (2) we get,

On substituting (3) in(1) we get,

1.) irish.

2.) settlers could obtain cheap land nearby

3.) steam engine

explanation:

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.