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y = 9/8 x + 15/4. Explanation in person.

This question has two parts, firstly the "12x(2x+1)" this is a product rule format, the 1/x is a simple differentiation format but for ease should be written as "x^(-1)" solution: dy/d...

Note: sorry for the lump of text, the format of the site will not allow paragraphs unfortunately... when I put // it means new section or new paragraph, sorry again for the inconvenience caused.//

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Bring the power down and multiply it to the value directly before x, and then remove 1 from the power after this. So in this instance 12 has no x or power with it, therefore it disappears because you mult...

First, you add the 5+3 to get 8. Now you know there are 8 'portions' of the £80 needed to be shared out. So £80/8 is 10. Sam needs 5 portions so 5x10=50 and Jack needs 3 portions so 3x£10 is £30.