What does it mean can anyone and give an example in number one

So there are a list of significant figures rules that, to be completely honest, are just much easier to have memorized so that you know them in the future.

Attached is a few rules with a link to a helpful webpage on the rules.

So for example in number 1, we need to change 22.60 m to 2 significant figures.

We know that the number we have is actually 4 significant figures, because the zeros after the decimal are considered significant. And we know that the 6 is also considered significant. So we are going to have to cut those 2 digits away from the number. So we have a leading '22' in front of the decimal. Since these are the 2 significant figures we are going to keep, we are then going to round up to 23 due to the number after the decimal being '0.6' (0.5 or higher, you round up to the next number).

So then the answer for number 1 will be 23 m.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.