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Answer: =7
Step-by-step explanation:
[tex]4+\sqrt{1}\times \:21-2\times \frac{3^3}{\left|-19-2\left(-8\right)\right|}[/tex]
[tex]=4+1\times \:21-2\times \frac{3^3}{\left|-19-2\left(-8\right)\right|}[/tex]
[tex]=4+1\times \:21-2\times \frac{3^3}{\left|-19+2\times \:8\right|}[/tex]
[tex]=4+21-2\times \frac{3^3}{\left|2\times \:8-19\right|}[/tex]
[tex]=4+21-3^2\times \:2[/tex]
[tex]=7[/tex]