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ginger1234
12.05.2021 •
Mathematics
(HELP) Triangle ABC is similar to triangle DEC. If AC measures 30 inches, then what is the length of AD?
A.18 inches
B.6 inches
C.20 inches
D.30 inches
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Ответ:
a1=7
r=2
n=14
then
Sn=a1*[(r^n)-1]/(r-1)>S14= 7*[(2^14)-1]/(2-1)=114681
the answer is 114681