What is the simplest way to write 0.4 repeating as a fraction

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

If f(x) = 2x - 6 and g(x) = 3x + 9, find (f - g)(x). a. (f-g)(x) = x + 15 o o b. (f- g)(x) = -x - 15 o c. (f- g)(x) = 5x + 3 o d. (f- g)(x) = -x+3 submit

Which of the following is true for the relation f(x)=2x^2+1