(5x5)+(4+1)=30 :)
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A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
1*47=47 Only that equation, because 47 is a prime number. >.>
28 2 27 3 29 1 etc...
One month can equal each of those numbers of days.
That would be equal to the sum of all natural numbers less than or equal to 100 minus the sum of all natural numbers less than or equal to 89. The sum of all natural numbers less than or equal to x can be calculated with this equation: x ∑n = n(n + 1) / 2 n=1 We can take the numbers given above then, and plug them into that sum, giving us the equation: x = 100(100 + 1)/2 - 89(89 + 1) / 2 x = 5050 - 4005 x = 1045