Ihave 3 algebra questions can anyone ?
the assignment is about : subtract polynomials
what i have to do : subtract the polynomials, showing all the steps necessary to write the answer in simplest form.

1. (9x - 4) - (3x + 2)

2. (3x^1 + 8) - (2x^2 + 1)

3. (5x^2 + 3x - 4) (x^2 - 6x )

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 .