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Q: What do all graphs of quadratic functions have in common?

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All quadratic functions with real coefficients can be graphed on a standard x-y graph. Not all quadratic functions have real roots, maybe that's what you were thinking of?

Where they all intersect.

All you do is set the quadratic function to equal to 0. Then you can either factor or use the quadratic formula to solve for your unknown variable.

They are all represented by straight lines.

All direct variation graphs are linear and they all go through the origin.

Polynomials have graphs that look like graphs of their leading terms because all other changes to polynomial functions only cause transformations of the leading term's graph.

It is not. If f(x) = ax2 and g(x) = -ax2 then the separate graphs will be two quadratic curves, f being "happy" and g being "sad". But f(x) + g(x) = 0 for all x and so is the x axis, not a quadratic.

No, sometimes the entire graph is completely above (or completely below) the x axis.

All graphs are graphical graphs because if they were not graphical graphs they would not be graphs!

There are 2 main functions that all dictionaries have in common. These dictionaries define words and tell the user how to use them.

Anything involving a square law automatically invokes a quadratic function by definition, even if the equations is as simple as y = x^2, such as the area of a square (hence the names). At a more advanced level, quadratic and higher-order functions crop up in all manner of real-life science and engineering problems.

Spelling and Definitions.

They all have in common ranges or outcomes with more than one possibility.

THere are infinitely many possible functions in any circle graph. Your question needs to be more specific.

Although there are many specific jobs that certain cells are all to do name five functions common to all cells?

Most graphs: Pie charts, bar graphs, histograms, scatter graphs can all be used.

they all compare different amounts

Do all linear graphs have proportional relationship

No.

No.

Of the three functions, all three pass the vertical line test. That is, if you draw a vertical line anywhere on the graph that the function is, that line will only pass through the function once. All three are also invertible functions, which means that there is a function that is capable of "undoing" the original function. And because the functions all pass the vertical line test, they are all able to be differentiated.

Whats all the graph

plant roots

There are some relationships but not all relationships are always true. Any function can be represented by an equation. But all equations are not functions. For example, y = sqrt(x) is the equation of the square root relationship which can be graphed as a parabola on its side, but it is not a function. It has slopes at each point. Some functions can be plotted as graphs but not all. A function such as f(x) = 1 when x is rational, and f(x) = 0 when x is irrational has no slope and cannot be plotted as a graph. A graph of a vertical line is not a function.

No.