HELPPPPPPPPPPPPPPP!!!!!!!!!!!!!Арифметическая прогрессия задана условиями [tex]

HELPPPPPPPPPPPPPPP!!!!!!!!!!!!!
Арифметическая прогрессия задана условиями [tex] a_{1} [/tex] = −3,1, [tex] a_{n+1} [/tex] =[tex] a_{n} [/tex] + 0.9
Найдите сумму первых 19 её членов.
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Помогите раскрыть скобки
1. We hardly (toleave) town, when it (to begin) to rain
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