A hot air blloon descended 99.9 meters in 12 seconds what was the balloons average rate of descent in meters per second

A simple way to solve this is to divide how much the balloon descended by how quickly it descended. So you take 99.9 m : 12 s and solve for the dividend, which would be 8.325 m/s. If you need to round to the nearest hundredth, you would round the 2 to a 3 because the thousandth number is a 5, and you always round up when the neighboring number is 5 or higher (and round down when the neighboring number is 4 and lower). Cheers!