Security can be combined. (Type a math noun)

3. Die for the benefit of the people. (Type a math noun)

5.four, three, two, one. (Type a math noun)

5. Look at thirty-one on the left and thirteen on the right. What's the total? (Type a word)

1, index

2. Perfect square

3. hectares

Step 4 count down the seconds

5. Number