A 12kg object sits on a horizontal surface. how much force is needed to give the object an acceleration of 4.5m/s?

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

Bugs bunny was 33 meters below ground, digging his way toward pismo beach, when he realized he wanted to be above ground. he turned and dug through the dirt diagonally for 80 meters until he was above ground

What is the number 321,000,000 in scientific notation? also what is the number? ?