$341,964
Explanation
Step 1
to solve this replace the valur of x in the equation with 70
[tex]C(x)=x^3-15x+14[/tex]so, when x=70
[tex]\begin{gathered} C(x)=x^3-15x+14 \\ C(70)=70^3-15\cdot70+14 \\ C(70)=343000-1050+14 \\ C(70)=341964 \end{gathered}[/tex]so, the answer is
$341,964
I hope this helps you