Please explain what this means:

Write an expression for 3.5 more than a number

does it mean 11.5 is 3.5 more than 8???

Yes. If "a number" is represented by x, 3.5 more than that would be

x + 3.5.
If you are studying algebra, that might be the answer thay are looking for.

thank you...

happy to be correct once in a while...

When you are asked to write an expression for "3.5 more than a number," it means you need to come up with a mathematical representation of adding 3.5 to a given number.

Let's say the number is represented by the variable 'x'. To find 3.5 more than this number, you can simply add 3.5 to 'x'.

So, the expression for "3.5 more than a number" would be written as:
x + 3.5.

Now, let's calculate the expression using an example:

If we assume the number 'x' is 8, to find "3.5 more than a number," you would add 3.5 to 8:
8 + 3.5 = 11.5.

Therefore, in this case, 11.5 is indeed 3.5 more than 8.