$\sqrt{x+3}=10\mid {\left(.\right)}^2$

${\left(\sqrt{x+3}\right)}^2={10}^2$  

$x+3=100$  

$x=97$  

 

$\sqrt{4y}=0,2\mid {\left(.\right)}^2$    

${\left(\sqrt{4y}\right)}^2={\left(0,2\right)}^2$  

$4y=0,04$  

$y=0,01$  

 

$\sqrt[3]{x+5}=-1\mid {\left(.\right)}^3$   

${\left(\sqrt[3]{x+5}\right)}^3={\left(-1\right)}^3$  

$x+5=-1$  

$x=-6$

 

$\sqrt[3]{\frac{t}{10}}=5\mid {\left(.\right)}^3$   

${\left(\sqrt[3]{\frac{t}{10}}\right)}^3=5^3$  

$\frac{t}{10}=125$

$t=1250$