A moving van crew picks up the following items: a sofa that weighs 158 pounds, a chair that weighs 65.7 pounds, a piano that weighs 3.8*10^2 pounds, and several boxes with a combined weight of 147.65 pounds. What total weight in pounds should be listed on the billing sheet? Express your answer in scientific notation.

Evaluate this exponential expression,8. (2 + 3)2 – 42

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Particles vibrate in a rigid structure and do not move relative to their neighbors.