Answer
$T_f=40.9^{\circ}C$
Work Step by Step
We know that:
$T_f=\frac{c_1m_1T_1+c_2m_2T_2}{c_1m_1+c_2m_2}$
We plug in the known values to obtain:
$T_f=\frac{386\times 0.600\times 80+4190\times 0.0700\times 10}{386\times 0.600+4190\times0.700}=40.9^{\circ}C$
