The function f(x) varies directly with x and f(x)=90 when x = 35. What is f(x) when x = 4?

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation:

is this part of a question or something

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!