[tex]\it 1) IV
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2) f(x) =-3x+1 [/tex]
[tex]\it a) f(-3) = -(-3)+1 = 3+1 = 4
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f(1) = -1+1=0
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b)\ \{-3,\ 1\}
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c)\ \{0,\ 4\}[/tex]
[tex]\it 3) \ f(x) = 2x-7,\ 2\ \textgreater \ 0 \Longrightarrow f(x) \ este\ strict\ cresc\breve{a}toare
\\\;\\ 4)\ f(x) =3x-1 \Rightarrow f(-1) =3\cdot(-1)-1 =-3-1=-4 \Rightarrow
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\Rightarrow A(-1,\ -4) \in \ Gf \Rightarrow \ corect\ este \ \ b)\ (-1,\ -4)[/tex]
[tex]\it 5)\ f(x) =52-3x,\ x = num\breve{a}rul \ zilelor
\\\;\\
x=7\ \Rightarrow \ f(7) = 52-3\cdot7=52-21=31\ lei\ (i-au\ r\breve{a}mas )[/tex]
