Math please I really need help I have to finish this by tomorrow

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Explain why the factor 1.5 is broke. into two numbers in the model.