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1 =-15+4b
16=4b
4=b
b. U10=a+(n-1)b
=-15+9.4
=-15+36
= 21
u1 = a = -15
_______________-
u5-u1= 4b = 1-(-15)
A. b = 16/4 = 4
Un = a + (n-1)b
= -15 + (n-1)4
= -15 + 4n - 4
= -19 + 4n
B. u10 = -19 + 4(10)
= -19 + 40 = 21