If f(x)=3 x - 7 x ,g(x)= X + 2 / 5 and g-1 of (x )=f(x) find the value of x​

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

42

step-by-step explanation:

256/6=42