What is the product of the binomials (4a – 1) and (2b + 3)?

a=18ab – 3
b=8a2b2 + 10ab – 3
c=6ab + 7a – 2b – 3
d=8ab + 12a – 2b – 3

Solve the triangle. a = 21°, c = 105°, c = 5

Math i have no idea how to do a and b

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 .