The first thing to do is add our 20 and 64. Our answer is 84, right? So then, we look at the answer choices. Lets start with A.). We first start with the parentheses. Cause of PEMDAS we start with parentheses. Alright so...16+16 is 76. Now don't get discouraged yet. We didn't add the 4 yet. So, 76+4= 80. Not close. So we can eliminate A.). Let's try B.).
Like I stated earlier, "We first start with the parentheses. Cause of PEMDAS we start with parentheses.". So, let's see...5+16=21 adding in our 4 it's 25. That's not even CLOSE to 84, is it?
C.) Is 80 as well.
D.) Is 25.
Hint: Maybe we have to round.
Hope this helps you!
Good Luck!!!!!!
