KS3 Maths Question - If your good at maths please help!

I'm not the smartest when it comes to maths, and I'm revising, so please could you answer these questions and tell me how you did it?

Link to maths paper : http://orderline.qcda.gov.uk/gempdf/1847…

Page 13 - Question 9

Thank-you so much!

I'll explain this the simple way, then the more detailed way, which you read is up to you.

Simple:

Basically minus the 2nd column from the first column to get the 3rd.

Answers are going from top to bottom: -19, 16, -22.

Slightly more detailed:

Hopefully since you're revising I assume you want to know why that is so you can apply it to future tests, so what the graph means is:

The first column decsribes what the actual temperature is without taking into account the wind.

The second column describes how much colder the wind makes it "feel" almost as if we could measure tempersture.

The final column shows what you and I would think the temperature is, if we could accurately measure it.

So to get how cold it feels with the wind we do this:

(How cold it actually is) + (How much colder the wind makes it "feel") = (What we feel the temperature to be)

You can re-arrange that to get the other answers.

Hope I helped with your revision, and good luck with any test you might have :).

Question 9, page 13
Let x be the unknown in each blank space.
2. x=-8-11=-19* C
3. -4+x=-20=>x=-20+4=-16 *C
4. x-23=-45=>x=-45+23=-22 * C

-8 - 11 = -19
-4 - x = -20 or x = 24 degrees colder
x - 23 = -45 or x = -22