Which regular polygon can be used to form a tessellation?

a) octagon

b) hexagon

c) pentagon

d) decagon

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

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

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)