Let A = R × R and f : A → A be given by the rule f(x, y) = (x − y, x + y). (a) Prove f is one-to-one. (b) Prove f is onto A. (Comment: don’t forget that if given b ∈ A, you construct a such that f(a) = b, you must also show a ∈ A.) (c) What is the inverse function? (d) Is f a permutation? Explain

13=7.8514=3.5feet15=10.99feet16=2& 317=418=about 9ft19=7.8520=4in

step-by-step explanation:

The answer is 270 cars.you can do this by making a proportional relationship. for instance, 200 is the whole we are using, so on a “number line” 200 would be over 100%. now, since he sells 35% more, add 35% to 100% to get 135% on the other side of the “number line” on the bottom half, leaving the top half empty.cross multiply 200 by 135 then divide by 100 to get your answer. i hope this , if it did, , if you don’t mind, giving me brainiest! 200/100% } 200 • 135 /100 ? /135%