a calculation answer of 423.6059 must be rounded off to three significant figures. what answer is report

424

Step-by-step explanation:

When rounding off, values from 5 to 9 are taken as 1 while values from 0 to 4 are taken as 0.

When you round the value up or down, you add it to the next value. Remember it's done from right to left

So, given 423.6059,

9 is taken as 1 and added to 5 which becomes 6. 6 also becomes 1 and added 0 which which becomes 1. 1 is 0 and added to 6. Finally, 6 becomes 1 and is added to 3 making it 4.

So we are left with 424 which is now in 3 significant figures