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Maths/Physics GCSE Urgent Help Required!!

I think this comes under GCSE Higher Maths or maybe Physics?

So a friend of mine needs GCSE Maths to start her degree (mature student) and really is desperate for some help on 3 questions (she has read the coursebook and has no idea)

If anyone is able to assist then please DM me today and I'll send the 3 questions over. Questions are on parity checks, inverse fourth power law, and sampling therom. This a bit of a hailmary but she has just had a baby and is broke so cannot afford a tutor or any other means of support. She has to complete questions by midnight today so I would really appreciate if anyone could lend a hand.

Thank you forum!
Reply 1
Last question attached below.
(edited 5 years ago)
Reply 2
Other two attached here.
Reply 3
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