What should come in place of the question mark (?) in the following questions? (NOTE : You are not expected to calculate the exact value) — Answer & Discussion

What should come in place of the question mark (?) in the following questions? (NOTE : You are not expected to calculate the exact value)
$$\sqrt[3]{7.938} \times (6.120)^{2}-4.9256=?$$

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CCommunity06 Apr 2019

Solution
Expression : $\sqrt[3]{7.938} \times (6.120)^{2}-4.9256=?$
$\approx \sqrt[3]{8} \times (6)^{2} - 5=?$
= $2 \times 36 - 5 = 72 - 5$
= $67 \approx 70$

CCommunity21 Apr 2019

Solution
Expression : $\sqrt[3]{7.938} \times (6.120)^{2}-4.9256=?$
$\approx \sqrt[3]{8} \times (6)^{2} - 5=?$
= $2 \times 36 - 5 = 72 - 5$
= $67 \approx 70$