A wave with a frequency of 14Hz has a wavelength of 3 meters. At what speed will this wave travel

Acar tire contains 0.0380 m^3 3 of air at a pressure of 2.20 ×10^{5} 5 n/m^2 2 (about 32 psi). how much more internal energy does this gas have than the same volume has at normal atmospheric pressure, 1.01x10^5 5 pa?

Could someone . i have tried to solve myself but my calculation is off

What are the dimensions of the cross section that passes through the points a, f, g, and d?