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Here it is

No worries that's what I'm looking for.

any idea what the little "red marks" mean in your picture?

What red marks are you referring to?

the little red lines on AB and BC

No clue tbh

oh. When you see a "hash mark" like those, it means the two line segments are the same length

so you should think: from A to B is some distance. and from A to C is twice the distance from A to B

Okay so it would be 160

now you need to read what they told you.
what did they tell you ?

ahh 40

yes.

For Q6, if AB is 28, then BC is what ?

it is the same picture and the same idea

56

AB and BC are the same size (that is what the red lines mean)

So they are both 28?

yes AB and BC are both 28

they say BC is also 3x+7
so if BC =28 and BC= 3x +7 we can say
3x+7= 28
can you "solve for x" ?