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Does a arrowhead have to opposite sides parallel?
No. Parallel means the two lines will never ever touch. Take a square for example, if the top two lines carry on going, they will never touch without changing direction. An arrowhead's lines will never touch because they are both diagonal and they already touch without going any further. Hope this helps. (PS: I learned this in school and obviously it helps!)
Why isn't a hexagon a parallelogram?
because in a parralelogram the lines never touch but in a hexagon the lines do touch on the sides, just not the top and bottom
How many solutions does y equals 2x and y equals 2x-4 have?
There is no solution for those equations because the lines are parallel so, they never touch.
How will the vertical line test be used to determine whether a graph is a function?
A function can only have one output for any given input. This means that any x value you choose cannot have multiple corresponding y values. The vertical line test involves looking at a graph and drawing vertical lines over it. If any of the vertical lines you have drawn touch the graph of the function more than once, then the graph does not represent a function.
If the discriminant is zero the graph of a quadratic function will cross or touch the x-axis time s?
It will touch the x-axis and not cross it.
