вычислите сумму первых девяти членов арифметической прогрессии (bn) если: 

b1=-17, d=6

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on october 31, the people living in the Lake View Estates realised that the flames were getting very close. they saw that the firefighter were helpless as the wind blew the flames in their direction. the lucky ones grabbed a few important things, rushed to their cars and drove away before the flames were too close.

 one family, however, waited too long. when they tried to drive to a nearby reservoir, they were trapped in the flames and died in their car.

 the fire burned for more than a week and then it got colder, fog rolled in from the ocean and the flame died.

 experts say that there have been forest fires for thousands of years. when it is very dry in California and a hot wind blows out of the desert, a burning cigarette that someone has thrown away may be a terrible fire.

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