What is the value of the following series when n=5 and ai=4i-7

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 .

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

Round each decimal to the nearest hundredth