LEVEL 1
1. Read and choose the correct sentence.
1. During summer holidays I ski, skate and sledge.
2. During summer holidays I lie in the sun, bathe in the river or sea and a
hiking.
3. During winter holidays I gather mushrooms and berries.
2. Choose the correct item.
1. I... eating a smoked meat now.
a) am
b) is
c) are
2. He ... giving me the krashanka.
a) am
b) is
c) are
3. She ... litting the candle.
a) am b) is
c) are
4. They ... cooking uzvar and kutia.
a) am b) is
c) are
5. We ... buying flowers for our mothers and sweet-hearts,
a) am
b) is
c) are​

А) Определить кол-во корней можно используя дискриминант.

D > 0 => уравнение имеет ровно 2 корня,

D = 0 => уравнение имеет ровно 1 корень,

D < 0 => уравнение не имеет корней.

1) 2x^2-3x+6=0

a = 2, b = − 3, c = 6

D = (− 3)2 − 4 · 2 · 6 = 9 − 4 · 12 = − 39 - уравнение не имеет корней

2) 5x^2-x-4=0

a = 5, b = − 1, c = − 4

D = (− 1)2 − 4 · 5 · (− 4) = 1 − 4 · (− 20) =  1 + 4 · 20 = 81 - имеет 2 корня

Б)Так как корни имеет лишь 2-е уравнение то для него и найдем корни

x1 =   (1 - √81)/(2·5)  =   (1 - 9)/10  =   -8/10  = -0.8

x2 =   (1 + √81)/(2·5)  =   (1 + 9)/10  =   10/10  = 1

Объяснение:

Не благодарите

One of the most significant economic branches of mass tourism.
Tourism is a risky business and depends on many factors, such as weather, economics and even neighbour countries.  Furthermore, 
there is fierce competition to attract tourists, not only among different 
countries but also among the resorts within each country.
Tourism is a growing industry and one of the largest sources of 
foreign exchange. Enormous sums of money are injected into the 
economies of some nations by winter and summer tourism. Employment 
opportunities in the service sector increase substantially.  Many cities are also important centers for international conferences and exhibitions.
The number of tourists increases steadily. Luxury establishments are developed for wealthy foreigners. Tourism supports many 
small businesses that provide food, lodging, fuel, and other supplies and 
services.