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I think the answer is (13-t)(13+t) because when you expand the brackets some of it cancells out like +169 - 169. As they are the same (but ones got a plus and ones got a minus) they cancel each other out. :)
I got 609 marks
437.5 marks.
169 + 169 = 338
25% of 169 = 42.25= 25% * 169 = 25%/100% * 169 = 0.25 * 169 = 42.25