I'm sorry if this is wrong
<em>I</em><em> </em><em>tried</em><em> </em>
Let present age of Anne be x
Two years ago she was Jim's age which is 10 yrs she is now double that age
10(x-2)
10x-20
= She is now 20 yrs
You're going to want to take out any unnecessary information, which is implemented to confuse you. This includes information regarding the volleyball team and the school band. You're trying to find how many games the school football team has won in all. You know that the basketball team has won 160 games in their history. You also know that the football team has won 18 fewer games than the school basketball team in their history. 160 - 18, which gives you your answer: 142 games.
Inverse, baseically
replace f(x) with y
switch all x and y
solve for y
replace y with f⁻¹(x)
f(x)=6(x+2)-3
replace with y
y=6(x+2)-3
switch x and y
x=6(y+2)-3
solve for y
x=6y+12-3
x=6y+9
minus 9
x-9=6y
divide 6
1/6x-3/2=y
replace
f⁻¹(x)=1/6x-3/2
when x=21
f⁻¹(21)=1/6(21)-3/2
f⁻¹(21)=21/6-3/2
f⁻¹(21)=21/6-9/6
f⁻¹(21)=12/6=
f⁻¹(21)=2
answer is f⁻¹(21)=2
inverse function is
f⁻¹(x)=1/6x+3/2