Find the slope m of the tangent to the curve

Question

y = 5/ sqrt (x) at the point where
x = a > 0.
what is the slope?

Answer 1

y = 5x^(-1/2)
dy/dx = (-5/2)x^(-3/2)

so when x=a

slope = (-5/2)x^(-3/2)

Answer 2

the answer is -5/a^2

Answer 3

-5/(a)(2 sqrt a)

Answer 4

-5/2a^3/2

Answer 5

WRONG

Answer 6

Your dumb @phillip