(2.5×10−8)(9×10−10)

express your answer in scientific notation.

2.25×10−19

2.25×10−16

2.25×10−17

2.25×10−18

The amount of energy it takes to lift a box might be a function of which of the following

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

One hectometer is a) 1/1000 of a meter. b) 1/100 of a meter. c) 10 meters. d) 100 meters. e) 1000 meters.