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80
Infinitely many, since every number in that range is a square of some other number. There are 7 perfect square numbers.
The sum of 80 and 70 is 150. Addition is a basic arithmetic operation where two or more numbers are combined to give a total. In this case, adding 80 and 70 together results in a sum of 150.
Prime numbers between 71 to 80 = 73 and 79 Therefore there are 2 prime numbers between 71 to 80.
8 and 9 because square root of 64=8 and square root of 81=9