What is the mean of 30,000,30,00040,000,40,000,40,000,5 0,000,190,000

What is the least common multiple of 6 and 17?

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.