- I don t understand this.?

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A 3.0 Hz wave travels on a spring. If the wavelength is 6.0 m, what is the speed of waves on the spring? Constant force of 5.60 N acts on a 2.80 kg object for 10.0 s. What are the changes in the object's momentum? -N·s? Is the rule y=2x ^3 represent an exponential function? If the equation of the axis of symmetry of a quadratic function is x = 0,
and one of the x-intercept is -4, what is the other x-intercept? How do you determine the number of valence electrons for an element?