Given f(x)=2[x]−1, evaluate −3f(2.79)+4f(−0.87). I literally couldn't find anything off of answering this question for some reason. I even copy pasted someone asking the question in bing.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!