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B7=b1•q^6= (-1/4)•(1/5)^6=
1 1 1
= - --- • -------- = – ---------
4 3125 12500
2. C)
3. A) 2, B) 3, C) 1, D) 4
4. x = 2; y = 3
5. a) 1) (-oo; +oo); 2) (-oo; -2) U (-2; +oo)
b) y(-1) = (-2+5)/3 = 1; y(5) = (2*5+5)/3 = 5
[1; 5]