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What compose of real numbers?
The set of all real numbers usually represented by a capital R that is double vertical line in the left and bold.
What is Nature of the zeros of a quadratic function?
If you have a quadratic function with real coefficients then it can have: two distinct real roots, or a real double root (two coincidental roots), or no real roots. In the last case, it has two complex roots which are conjugates of one another.
How many real solutions does the following quadratic equation have by using the discriminant?
If the discriminant > 0 then 2 distinct real solutions.If the discriminant = 0 then 1 double real solution.If the discriminant < 0 then no real solutions (though there are two complex solutions).
What is the name of the study where neither the researchers nor the participants know who is getting the real treatment?
double blind
Does a real Double tails quarter exist?
No. They're all privately-made novelty items. In fact, the Mint uses dies that are "keyed" so a tails-side die cannot be put into the heads side of a press, precisely to prevent anyone from creating a real double-sided coin. Please use this site's Search feature to look for the word DOUBLE and you'll find hundreds of similar questions. double-tailed quarter has been certified as a real mint error. See related link to the Coin World article.
