How many gallons of a 50​% antifreeze solution must be mixed with 80 gallons of 25​% antifreeze to get a mixture that is 40​% ​antifreeze?

stop cheating

step-by-step explanation:

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.