5^2 + 12^2 = c^2 show work i dont quite know how to finish the ending part off .

5^2 + 12^2 = c^2
25 + 144 = c^2
169 = c^2
take the square root of both sides
+ - 13 = c

Your answer would be 8. You can drop the 2 because it is less than 5, so you cannot round up. You drop the nine and raise the 6 to a 7. So then it becomes 7.7 You then take the second 7 and round your number up to 8. So your final answer should be 8.