How to find the sum of all coefficients in the expansion.

Find the maximum value of p= 4x + 5y subject to the following constraints :

Which expression is the factorization of x^2+10+21

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 .