It depends of the type of decimal (exact decimal, periodic...)
$${\mathtt{\,-\,}}{\mathtt{11}}{\mathtt{\,\small\textbf+\,}}\left({\mathtt{12}}\right){\mathtt{\,\small\textbf+\,}}\left({\mathtt{15}}\right) = {\mathtt{16}}$$
$${\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{5}} = {\mathtt{60}}$$
If you mean ( X + 4 )^2, is a notable product
802 ???
Maybe??
$${{\mathtt{x}}}^{{\mathtt{x}}} = {\mathtt{2}}$$
pens percentage=100- (Red pens+Black pens+Green pens) =100-48 =52 (52% of all pens)=(48% of all pens)+180 →(4% of all pens)=180 So the total number of pens in the shop is 4500 pens.
$${\frac{{\mathtt{625}}{\mathtt{\,\times\,}}{\mathtt{1}}{\mathtt{\,\times\,}}{\mathtt{8}}}{{\mathtt{1}}}}{\mathtt{\,\times\,}}{\mathtt{1}}{\mathtt{\,\times\,}}{\mathtt{5\,280}} = {\mathtt{26\,400\,000}}$$
$$\left({\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,-\,}}{\frac{{\mathtt{2}}}{{\mathtt{2}}}} = {\mathtt{5}}$$
$${\mathtt{9}}{\mathtt{\,\times\,}}{\mathtt{1\,998}}{\mathtt{\,\small\textbf+\,}}{\frac{{{\mathtt{50}}}^{{\mathtt{15}}}}{{\mathtt{395}}}} = {\mathtt{77\,259\,691\,455\,696\,202\,549\,627.569\: \!620\: \!253\: \!164\: \!557}}$$
+1222 