Реши

\(C=6000+4100\cdot6=30600\) руб.

\(x\in[-3;5]\) — вариант 2.

\(S_7=\frac72(2\cdot0{,}6+6\cdot0{,}1)=6{,}3\) м.

\(S=\frac12\cdot7\cdot12=42\).

\(\frac54a^2=(2\sqrt5)^2=20\Rightarrow a^2=16\).