If f(n) = n² - 2n, then f(2) = 0. True False

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

In a timed typing test lara typed 63 words per minute. estimate the number of words she should be able to type in half in hour show your work