I NEED HELP I'M BEING TIMED! This is on Edgenuity. Which carries information by copying an original sound?

analog signal

digital signal

volume

frequency

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

He latent heat of vaporization for ethyl alcohol is 854 j/g. the amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is