Answer
$\dfrac{12t + 5sa^4b^4}{27a^8b^7}$
Work Step by Step
$\frac{4t}{9a^8b^7} + \frac{5s}{27a^4b^3}$
$= \frac{4t \times 3}{9a^8b^7 \times 3} + \frac{5s \times a^4b^4}{27a^4b^3 \times a^4b^4}$
$= \frac{12t + 5sa^4b^4}{27a^8b^7}$
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