How many significant figures does this measurement have

None, for there is nothing to measure.

Fun fact: 2 + 2 = 5

Proof:

20 - 20 = 25 - 25

4 * 5 - 4 * 5 = 5 * 5 - 5 * 5

4 (5 - 5) = 5 (5 - 5)

4 = 5

2 + 2 = 5

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.