Respuesta :
Answer:
For solar: [tex]S(x)=6240+75x[/tex]
For traditional: [tex]T(y)=850+320y[/tex]
Step-by-step explanation:
Cost to install solar water heater = $6240
The average annual cost to run the solar water heater is about = $75
Total cost to run x years : [tex]S(x)=6240+75x[/tex]
A traditional gas water heater costs about = $850
The average annual cost to run = $320
Total cost to run y years : [tex]T(y)=850+320y[/tex]