The first answer in the blank is pours out of you, the second answer in the space provided is diffuse. It is because a person who has an effusive personality will likely pour out his or her emotions while the motor oil will likely diffuse if this has been spilled out of the can.
Frequency = speed ÷ wavelength
= 330m/s ÷ 2.5m
= 132 Hz
(4/9-9) and (4/0) are undefined as you can not divide by the value of 0.
