Someone help me out plss

 C) 611 square miles

Step-by-step explanation:

Create a perpendicular from the vertex (A) to the base (BC) which creates a 30-60-90 triangle on the right side. Label this point D.

Use the 30-60-90 triangle rules (b - b√3 - 2b)  to calculate the height of the triangle.

2b = 47  --> b = 23.5

AD = b√3 = 23.5√3

Area of a triangle = (1/2) base x height

                             = (1/2)  30    x  23.5√3

                             = 610.5479

                             ≈ 611

(y+7)^2= -52(x-3)

Step-by-step explanation: