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

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5