= 16 + 49 - 3(11) - 4(10)
= 16 + 49 - 33 - 40
= -8
The answer is 35000. Because 2 significant figures means the 2nd number, in this case it is the number 4 and if we want to round off something, look at the next number, if more than 5 or 5, you must round up.
Yes. It is equivalent to 3. Combine like terms