Bill says he can add 23 and 40 without regrouping. is bill correct? how do you know?

Step-by-step explanation:

Yes bill is correct because both numbers are easy to add without regrouping, since when each of the digit are added there won't be carried over. Also, I believe Bill should be able to do simple mathematics like 2+3, 3+5 and so on.

Then, he should be able to add 3 plus 0 in his head and keep the result as 3. And then add the other 2+4 and he will put the two result together as 63

correct answer:

i^31 = -i

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: