Answer:
[tex]\bold{a_{15}=-25}\\\\\bold{a_{25}=-65}[/tex]
Step-by-step explanation:
[tex]f(n)=35-4n\\\\f(n)=-25\quad\implies\quad n=\,??\\\\-25=35-4n\\\\-25-35=-4n\\\\4n=60\\\\n=15[/tex]
A 15th term in sequence is -25
[tex]a_{25}=35-4\cdot25=35-100=-65[/tex]