How can I do this? | Mathematics | Page 1

clever stirrup Apr 25, 2024, 6:55 PM

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I have noooo idea

dim waveBOT Apr 25, 2024, 6:55 PM

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warm dagger Apr 25, 2024, 11:25 PM

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first, we can write:

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A5=A11-6d

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A7=A11-4d

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A4=A11-7d

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A9=A11-2d

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Then, put these in the eqn A5A7-A4A9=60, where A11 =25

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You will get a quadratic of d (Common difference).

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For part 2 of the question, solve using the formula An=A1-(n-1)d

#How can I do this?