Respuesta :
[tex] \bf \stackrel{\textit{the amount spent on }\stackrel{H(t)}{heating}\textit{ depends on the average }\stackrel{t}{temperature}}{H(t)} [/tex]
[tex] \bf \stackrel{\textit{the amount spent on }\stackrel{H(t)}{heating}\textit{ depends on the average }\stackrel{t}{temperature}}{H(t)} [/tex]