z1+z2;z1-z2;1)z1=3-7i;z2=4i

Люди добрые,помогите!!! 

Exercise 1.Rearrange the sentences putting the words in their correct order.

1776, originated, the USA, in.
Republic, fifty states, comprises, the federal.
On the north, Canada, is bounded, the country, by.
Is varied, the population, the national composition, of.
More than, five cities, a million people, in the USA, have.
Are imported, petroleum, in the USA, electrical apparatus, and.
In the world, the first, it, industrial, in, takes, output, place.