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OpenStudy (anonymous):
Given an arithmetic sequence with a7=19 and a12=54, find a15.
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OpenStudy (amistre64):
12-7 = 5 steps 54 = 19 + 5(d) ; solve for d
OpenStudy (anonymous):
7?
OpenStudy (amistre64):
54-19 = 5(d) .... 7 is good :)
OpenStudy (amistre64):
now lets use that to determine 8 steps from a7 a{15} = 19 + 8(7) i believe
OpenStudy (anonymous):
Thanks so much! :)
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OpenStudy (amistre64):
youre welcome :) always dbl chk me work tho... im old and forgetful
hero (hero):
Looks right to me
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