The exclamation point is the symbol for the factorial function.
For integer values of n, n! = 1*2*3*...*n
The factorial is critical for calculating numbers of permutations and combinations.
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There are several websites that you can use to get help with math problems. Some of those sites are wwww.webmath.com and www.mathway.com.
That would really depend on the difficulty of the math problems. Some problems can be solved in seconds by somebody experienced in math, others may take hours.
2x 2 squared
apple + banana= grape
That's the plural of locus - the set of all points that satisfy some condition.