What is the wavelength of an earthquake wave if it has a speed of 3 km/s and a frequency of 10 hz?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.