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If a/b=7/3 then find the values of the following ratios.\frac{5 a+3 b}{5 a-3 b} \quad\left(\text { ii) } \frac{2 a^{2}+3 b^{2}}{2 a^{2}-3 b^{2}} \quad\left(\text { iii) } \frac{a^{3}-b^{3}}{b^{3}} \quad(\text { iv }) \quad \frac{7 a+9 b}{7 a-9 b}\right.\right. |
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