Hardy weinberg question?

Question

this is hard.. Tongue rolling is a dominnant trait in which a person can roll the tongue into the shape of a taco shell. In a human population of 1000, 840 are tongue rollers ( TT or Tt), and 160 are non-tongue rollers(tt). what is the frequency of the DOMINANT ALLELE (T) in the popluation?

Answer 1

it's definitely .6

Answer 2

p^2 + 2pq + q^2 = 1

0.840 + q^2 = 1
q^2 = 0.160
q = 0.4

p + q = 1
p = 0.6 = frequency of dominant allele