Question

please help me how is it....

Answer 1

LOOK this is so simple

subtracting both side by 1 in inequality we have:

$1 - 1 - {(7 \div 10)}^{n} \geqslant 80 \div 100 - 1$

$- \frac{7}{10} \geqslant \frac{80 - 100}{100}$

$- \frac{7}{10} \geqslant - \frac{20}{100}$

multiplying both sides by -1 we get :

$\frac{7}{10} \leqslant \frac{20}{100}$

here when we multiply both sides by -1 in an inequality the sign of inequality gets changed.

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