No 6b) Why if you measure yourself at different places around the world with a spring scale or a balance scale, do you get two different answers?

Why does the balance scale always give the same answer and the spring scale varies?

GRAVITY!

One is comparing masses and the other is measuring the force of gravity!
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The science behind it;
- When you are using a balance scale, you are comparing one mass to another. Literally comparing two items with the same amount of "stuff"/mass.

- When you are using a spring scale, you are measuring the pull of the Earth on your object.

Since this pull varies around the planet, in some places you will be lighter and in others you will be heavier.