F(x)=-x^2-9x-7 find f(3)

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking: