Answer:
[tex]\Delta T = T_{max,w} - T_{min,w}[/tex]
[tex]\Delta T = 20\,^{\circ}F - (-12\,^{\circ}F)[/tex]
[tex]\Delta T = 32\,^{\circ}F[/tex]
Step-by-step explanation:
The expression needed is the highest temperature of the week subtracted by the lowest temperature of the week. That is to say:
[tex]\Delta T = T_{max,w} - T_{min,w}[/tex]
[tex]\Delta T = 20\,^{\circ}F - (-12\,^{\circ}F)[/tex]
[tex]\Delta T = 32\,^{\circ}F[/tex]