The answer is 25. In the sum 3 x 3 + 4 x 4... you perform the multiplication first.
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4 + (5 x 3) = 19
Really what grade are you in the answer the answer is easy... if you are struggling just add 3 together 4 times and you will get the anwer
-2 times 3 is -6 and add 2 you get -4
If you mean ' "When" do you add exponents? ' then the answer is when the same base of equal or different exponents is multiplied. in other words, when you hav "3 exponent 3 times 4 exponent 5 " you can't add the exponents because the bases (3 and 4) aren't the same.
You take 4 times 5 which is 20 then 3 plus 2 which is 5. Add 20 plus 5 and you get 25. That's the answer.