Answer:
[tex]f(t)=50+10(t-70)[/tex]
Step-by-step explanation:
Let the outside temperature be [tex]t[/tex] degree.
So, when [tex]t=70[/tex] degree, number of members, [tex]f(t)=50[/tex]
Now, for every degree rise in temperature, 10 members gets added.
So, when the temperature is [tex]t[/tex] degrees, rise in temperature is [tex](t-70)[/tex] degrees.
Therefore,
For [tex](t-70)[/tex] degrees rise, number of members added = [tex]10(t-70)[/tex]
Hence, total number of members added as a function of temperature is given as the sum of members at [tex]t= 70[/tex] degrees and for [tex](t-70)[/tex] degrees rise. This gives,
[tex]f(t)=50+10(t-70)[/tex]