What is the wavelength of an earthquake wave if it has a speed of 7 km/s and a frequency of 3 hz?

What is sin 7x/4 ? i need on this urgent trig

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Write an equation for the function that includes the points (2,100)and (3,100)