Hey there!
Part A: 6,300 kilograms converted to grams would be 6,300,000. Right this into standard form would be the following:
6.3×10
= 6,300,000
Part B: We do 7×10
= 0.00007
0.00007 × 6,3000 = 0.441
0.441 converted to standard notation would be the following:
4.41×10

Hope this answers your question!