# Maths hw - arithmetic sequence

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Can u pls help me with this Q? Thanksss

Q: The first term of an arithmetic sequence is 12, the last is -78 and the sum is -363. Find the number of terms in a sequence and the difference

Q: The first term of an arithmetic sequence is 12, the last is -78 and the sum is -363. Find the number of terms in a sequence and the difference

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#2

(Original post by

Can u pls help me with this Q? Thanksss

Q: The first term of an arithmetic sequence is 12, the last is -78 and the sum is -363. Find the number of terms in a sequence and the difference

**isabellazafe**)Can u pls help me with this Q? Thanksss

Q: The first term of an arithmetic sequence is 12, the last is -78 and the sum is -363. Find the number of terms in a sequence and the difference

You will need to solve some simultaneous equations

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**isabellazafe**)

Can u pls help me with this Q? Thanksss

Q: The first term of an arithmetic sequence is 12, the last is -78 and the sum is -363. Find the number of terms in a sequence and the difference

Now write an expression for the sum of n terms, setting it equal to -363.

Both of your equations are in terms of n and d. As you have two, you can solve for both n and d.

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You will need to solve some simultaneous equations

**davros**)You will need to solve some simultaneous equations

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#5

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Shouldn't be necessary if they have the formula , though I'm not sure if it's still taught.

**ghostwalker**)Shouldn't be necessary if they have the formula , though I'm not sure if it's still taught.

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**ghostwalker**)

Shouldn't be necessary if they have the formula , though I'm not sure if it's still taught.

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