First, we need to understand that the tenth place is the first number to the right of the decimal point. In this case, the value in the tenth place is a 5. Then, to determine if we need to round up or down, we need to look at the next value, which is 9. Since 9 is more than 5, we need to round up. So therefore, the 5 must become a 6 and your final answer is 43.6.
Hope this helps.