tolong kasih caranya no.29,30 dan 31.

[tex]29) \sqrt[3]{8000} \div \sqrt[3]{64} \\ = 20 \div 4 \\ = 5 \\ 30)l \: persegi = s \times s \\ = 9 \times 9 \\ = 81cm {}^{2} \\ l \: segitiga = \frac{1}{2} \times a \times t \\ = \frac{1}{2} \times 9 \times 7 \\ = 31.5cm {}^{2} \\ l \: gab = 81 + 31.5 = 112.5cm {}^{2} [/tex]