What property is this? 6x7=(6x5)+(6x2)

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points

10x − 5y + 14 = 0 whats the answer pls