$\text{a)}3<\sqrt{12}<4,$   

$\text{poniewaz˙:}\sqrt{9}<\sqrt{12}<\sqrt{16}$   

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$\text{b)}5<\sqrt{29}<6,$  

$\text{poniewaz˙:}\sqrt{25}<\sqrt{29}<\sqrt{36}$  

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$\text{c)}-9<-\sqrt{70}<-8,$  

$\text{poniewaz˙:}-\sqrt{81}<-\sqrt{70}<-\sqrt{64}$  

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$\text{d)}-12<-\sqrt{140}<-11,$  

$\text{poniewaz˙:}-\sqrt{144}<-\sqrt{140}<-\sqrt{121}$  

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$\text{e)}4<\sqrt[3]{75}<5,$  

$\text{poniewaz˙:}\sqrt[3]{64}<\sqrt[3]{75}<\sqrt[3]{125}$  

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$\text{f)}5<\sqrt[3]{144}<6,$  

$\text{poniewaz˙:}\sqrt[3]{125}<\sqrt[3]{144}<\sqrt[3]{216}$