Posted by HApida on .
The temperature in degree celcius in a factory during the course of a working day from 6am to 10pm can be modelled by the function
H(t)=18+6sin(pit/85pi/4)for 6<t <22
_ _
where t is the time in hours in 24Hr clock.
what are the highest and lowest temperatures during the working day.

math 
bobpursley,
highest is when sin=1, lowest when sin=1
Thigh= 18+6
Tlow= 186