Find the answer by substituting number into the equation
X + X2 = 90
and you will find that
X = 9
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You square each number and multiply that by the frequency with which that number appears. You then sum together these results.
If: x+x2 = 110 then x = 10 which is the solution
Ninety degrees. The name comes (I think) from the fact that one angle of a square is ninety degrees. Or in the case of all 4 right angles added together the sum would be 360 degrees.
The number is 1.
find the sum of 2 and 2