I need assitance answering this.

Ineed to find the answer of this question because i dont understand it

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !