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There are none. Two odd numbers added together equal a even number.
Yes, if the number whose square root we are taking is greater than 0. Only if you try to take the square root of a negative number will you get back an imaginary number. Square roots are often irrational, but that's different from real versus imaginary.
There's only one number that's equal to 80. It's 80.There's a good chance that there could be three numbers whose sum is 80, or threedifferent numbers whose joint product is 80, but the question doesn't ask for those.
It would be possible to find two numbers whose sum is 7, two others whose difference is 7,two others whose product is 7, and two others whose quotient is 7.But if you're looking for numbers that equal 7, then 7 is your only choice.
It's quite possible to find two numbers whose sum is 308, two others whose differenceis 308, two more whose product is 308, and another two whose quotient is 308.But if you're looking for numbers that equal 308, then your only choice is 308 .