Need on 3 algebra questions 13. divide the rational expressions. (7y-1)/(y2-36)÷(1-7y)/(y+6)2. add or subtract as indicated. write the answer in descending order.(3n^4 + 1) + (–8n^4 + 3) – (–8n^4 + 2) a. –13n^4 + 6 b. 3n^4 + 6 c. 3n^4 + 2 d. 19n^4 – 46. perform the indicated operations. "see picture below"

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 .