Please help solve this:

27x^2 + 15x + 10 = 0

I don't get what I need to do.

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Evaluate cos2θ for cosθ = square root of 3/2