IN HASKELL please create these two functions

$10\mathrm{.}9$ Give the type of and define a function iter so that

iter $n$ f $($f $x)$

where $f$ occurs $n$ times on the right$-$hand side of the equation. For instance,

we should have

iter $)$

and iter $0$ f $x$ should return $x.$

$10\mathrm{.}10$ Using iter and double define a function which on input $n$ returns $2^n$; re$-$

member that $2^n$ means one multiplied by two $n$ times.