боковая сторона равнобедренного треугольника =17 см.А высота проведённая к ней =8 см.Найти основание.

в геометрической прогрессии b3 b4 b5=64. найти четвёртый член этой прогрессии

Как читаются эти числа на английском языке:
(250), (5,140), (704), (46), (20), (12,212).

Помогите решить,пожалуйста.
Log6(x^2+7x)=Log6(8x+42).
Log3(21-x)=log3(x-7)+2.
Log2(x^2-4x)=log2(6x-16).

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