4. Change 2,500,000 into scientific notation

2.5 x 10^6

Explanation:

Move the decimal so there is only 1 non zero to the left of the decimal point (2.500000)

the answer is na (sodium)

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )