I need help with algebra :). This is my current problem, (r^2 + 6r + 5) (5r^2 + r -5) BTW, the '^' sign means root of, or to the power of.

The average daily maximum temperature for laura’s hometown can be modeled by the function f(x)=4.5sin(πx/6)+11.8 , where f(x) is the temperature in °c and x is the month. x = 0 corresponds to january.what is the average daily maximum temperature in may? round to the nearest tenth of a degree if needed.use 3.14 for π .