What is the independent variable and why?

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

If a balloon is taken outside on a very cold day, what will occur?