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В решении.

Объяснение:

Дана функция y=√x.

а) Чтобы определить принадлежность точки графику, нужно известные значения х и у (координаты точки) подставить в уравнение. Если левая часть равна правой, то принадлежит, и наоборот.  

у=√х  

1) А(0,04; 0,2)  

0,2 = √0,04  

0,2 = 0,2, проходит.  

2) В(81; -9)  

-9 = ±√81  

-9 = -9, проходит.  

3) С(54; 3√6)  

3√6 = √54

3√6 = √9*6  

3√6 = 3√6, проходит.  

б) х∈ [0; 16]  

y=√0 = 0;  

y=√16 = 4;  

При х∈ [0; 16]   у∈ [0; 4].  

в) у∈ [7; 13]  

у = √х  

7=√х           х=7²          х=49;  

13=√х          х=13²        х=169.  

При х∈ [49; 169]   у∈ [7; 13].