Answer:
4. 7/9 (b - 27) > 49/81
=> 7/9b - 21 > 49/81
=> 7/9b - 21 > 7/9
=> 7/9b -21 + 21 > 7/9 + 21
=> 7/9b > 7/9 + 189/9
=> 7/9b > 196/9
=> 7/9b / 7/9 > 196/9 / 7/9
=> To divide fractions, take the reciprocal of the divisor fraction and then multiply.
=> b > 196/9 x 9/7
=> b > 1764 / 63
=> b > 28
4th answer is b > 28
5. This question doesn't make any sense.
=> 11w - 8w greater or equal to 14w
=> 3w greater or equal to 14w.
If we make "w" as any number, this equation will not come true as 14 is larger than 3.
This answer may be correct the equation is like:
3w is smaller or equal to 14w.
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