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U4= 5 + 3 . 9
U4= 5 + 27
= 32
b. U4 = a + 3b
= -6 + 3 . 5
= -6 + 15
= 9
c. U15= a + 14b
30 = a + 14(-5)
30 = a -70
30+70 = a
a = 100
U4 = a + 3b
= 100+3(-5)
= 100-15
= 85