Answer:
f(-1)=
f(2)=
Step-by-step explanation:
let f(x)=f(-1)
but f(x) =3x+1
substituting it into the equation
3x+1=-1
3x=-1-1
3x=-2
dividing through by 3
f(-1) =
f(2)
let f( x )=f(2)
then
3x+1=2
3x=2-1
3x=1
new depth =
4.2/100 X 89 = 3.738 feet
Answer: -3
18/6 = 3
18/-6 = -3