A32-n force acts on a small mass in the positive x-direction. a 26-n force also acts on it in the negative x-direction. what is the equilibrant of these two forces?

Equilibrium force is the force that will keep the small mass in place, hence no movement must be made. So we know that 32 N of force is acted towards the positive direction so +32 N. Which is counteracted by 26 N force so:

32 N – 26 N = 6 N (positive)

Since positive 6 is left, therefore this must be acted by an equilibrant negative 6 N.

- 6 N 

c)as speed changes, wavelength and frequency change.

everything changes!

d.7.5cm is your answer