Whoever answers first correctly I'll leave alone Help please just this

3. A library charges a late fee of $3.50 plus $0.15 per day that a book is returned late.

B. Make an equation to find if the total fee if a book is 10,15,20, or 25 days late. Then graph the ordered pairs.

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 .