Является ли число В членом геометрической прогрессии b'n? Если да то укажите его номер:
b'n =0,002 * (корень из 5 в степени n-4)
B= 0,25

Нужен полный ответ!!!!
На фотке задание 17.17 (б)

сократить дробь 2х²-5х+3

                                ------------

                                2х²+5х-7

Решить и объяснить точно.

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Маша истратила 30%.у неё осталось 280 руб. Сколько денег у неё было?