Could you tell me the answer please it is not multiple-choice

a) 300000 b) 200 c) 20000

Step-by-step explanation:

Round so that there is only 1 sig. fig. in the answer

a) 300000 (rounded up to 300,000 not 280,000 as there would be 2 sig figs, 2 and 8)

b) 200 (rounded down)

c) 20000 (rounded up to 20,000 not 18,000 as there would be 2 sig figs, 1 and 8)

The trailing zeroes do not count as sig. figs. so the above answers all have only one sig. fig.

the answer is simply just 6n add the two together as they have an n