Question

1 si 2 va rog frumos<br /> E urgent

Answer 1

f(x)=x+2
f(1)=1+2=3
f(2)=2+2=4
f(3)=3+2=5
......................
f(20)=22  Le  aduii
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f(1)+f(2)+...+f(22)=3+4+...+22=250.
2)f(x)=5^(-x)
f(-1)=5^1=5
f(0)=5^0=1
f(1)=1/5    5f(1)=5*1/5=1
f(-1)+f(1)+5f(1)=5+1+1=7