13. Suppose that a and b are integers, a = 4 (mod 13), and b = 9 (mod 13). Find the integer c with 0 ≤ c ≤ 12 such that a) c = 9a (mod 13). b) c = 11b (mod 13). c) c = a + b (mod 13).

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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13. Suppose that a and b are integers, a = 4 (mod 13), and
b = 9 (mod 13). Find the integer c with 0 ≤ c ≤ 12 such
that
a) c = 9a (mod 13).
b) c = 11b (mod 13).
c) c = a + b (mod 13).
2a + 3b (mod 13).
a² + b² (mod 13).
d) c =
e) c =
f) c =
a³ - b³ (mod 13).
Transcribed Image Text:13. Suppose that a and b are integers, a = 4 (mod 13), and b = 9 (mod 13). Find the integer c with 0 ≤ c ≤ 12 such that a) c = 9a (mod 13). b) c = 11b (mod 13). c) c = a + b (mod 13). 2a + 3b (mod 13). a² + b² (mod 13). d) c = e) c = f) c = a³ - b³ (mod 13).
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