The formula for an arithmetic sequence is An=A1+(n-1)d.
Using this knowledge, you can set up the equation easily to be An=1+(12-1)-5
You then simplify this to 1-55 using PEMDAS, giving you the answer for the twelfth term being -54, you then do this for every term if you want (or you could just subtract 5 by the terms after 14 till you get to -54. After all that, you add the twelve terms up to get -319 as your final answer
3 you’re welcome
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Eliminate p terms
times 2nd equation by -1
q-2p=-5
add to 2nd equation
q-2p=-5
<u>7q+2p=29 +</u>
8q+0p=24
8q=24
divide both sides by 8
q=3
sub back
2p-q=5
2p-3=5
add 3
2p=8
divide by 2
p=4
p=4
q=3
9.6 cause it can be a fraction or ratio
Picture is not so clear it’s blur
