Answer
a $70^{\circ} F, 76^{\circ} F, 85^{\circ} F$
b) $75^{\circ} F$
Work Step by Step
a) Here, $T(t)=85-3\sqrt {25-t}$
Now, $T(0)=85-15=70^{\circ} F$; $T(16)=85-9=76^{\circ} F$; and $T(25)=85$
b) Consider the integral $\dfrac{1}{25}\int_{0}^{25} 85 - 3\sqrt {25-t} dt=\dfrac{1}{25} (85(25)+0-0-(2)(125)]=75^{\circ} F$
