There are 6.02 × 1023 atoms in 1 gram of hydrogen. how many atoms are there in 800 grams of hydrogen? write your answer in scientific notation. if necessary, round your answer to the nearest hundredth. 4.82 × 1026 48.16 × 1025 4.82 × 1023 4.82 × 1020

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."