Development begins at birth , true or false

What is tge speed of sound in dry air at 0°c

Mars has a surface gravity that is only 0.38 (a little over one-third) that of earth's. thus, the weight of an object will also be 0.38 times that of earth. what is the g.p.e. of a climber who weighs 675 newtons on earth at the top of 26,000-meter olympus mons?

Assume you wanted to save 2000 to buy a used car 18 months from now. how much money do you need to save every week to accomplish your goal?