d/. -40'F =-40.00000℃
c/. 122'F=50.00000℃
b/. 86'F =30.00000℃
a/. 68'F = 20.00000℃
d/. -40'F = -4℃
c/. 122'F= 5℃
b/. 86'F = 3℃
a/. 68'F = 2℃
\(-40^\circ F=\dfrac59.(-40-32)^\circ C=-40^\circ C\\122^\circ F=\dfrac59.(122-32)^\circ C=50^\circ C\\86^\circ F=\dfrac59.(86-32)^\circ C=30^\circ C\\68^\circ F=\dfrac59.(68-32)^\circ C=20^\circ C\)