How does the author develop the central idea? by emphasizing the advancements in the technologies of flying cars
O by describing older television shows about flying cars as quaint
O by stressing that flying cars can only operate when there are clear skies
O by arguing that flying cars are superior to traditional automobiles

you can infer that to folke dude was spying for allied nations

i may be wrong but i think your answer is flashback

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.