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OpenStudy (anonymous):
Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81
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OpenStudy (retireed):
Clue 1) the delta between each number is 6
OpenStudy (retireed):
Clue 2) the delta between between the first number and the last number is 90
OpenStudy (retireed):
Clue 3) 90 divided by 6 is 15 Now but it all together.
Directrix (directrix):
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