Pulse oximeters actually measure the amount of infrared light that gets absorbed and transmitted by blood and then compares it to those same measures but for red light waves. Given what you know about how red light will interact with red blood, is it possible for the blood to be changed by the light waves? Why or why not?​

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c