physics,Field due to Charge?

Question

Find the electric field (in N/C) at a point r =1.3 m above a point charge of magnitude Q= -43 μC. Take upwards to be positive.

Answer 1

E = kQ/r^2
plug in the numbers.
k = 1/(4"pi"*"epsilon"*"epsilon-sub-zero") all this numbers are in your book
"epsilon"=1 in your case (vacuum) if book doesn't say