Must show units and how they cancelli 1.) 175 km to um 3.) 385 nm to dm 5.) 492 um tom 7.) 52 x 103 dm to mm 9.) 321x 1035 mm to km 11.) 456 x 103 m to km 13.) 422 x 103 m to nm 15.) 4.87 x 1030m to pm 17.) 5.26 x 103 m to um 19.) 1.25 x 1035 m to mm 21.) 4.22 x 103 tm to nm

Explanation:

1.) 175 km to μm

3.) 385 nm to dm

5.) 492 μm  to m

1 μm =  

7.) dm to mm

1 dm = 100 mm

9.) mm to km

11.) m to km

m = 0.001 km

13.) m to nm

15.) m to pm

17.) m to um

1 m =  

19.) m to Mm

1 m =  

21.) Tm to nm

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

2b2t

explanation:

2b2t