If a polynomial function f(x)has root -2 + square root 8 and 9 what must be a factor of f(x)

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music. they were asked how they like three types of music: rock, country western and jazz. the results are summarized below: no one dislikes all three types of music. six like all three types of music. eleven don’t like country western. sixteen like jazz. three like country western and jazz, but not rock. six don’t like rock. eight like rock and country western. seven don’t like jazz. how many students were surveyed?

What are the triple angle formulas? is it related to double angle identities?