How many ways can you make 85?

Answer 1

Infinitely many.

Start with addition/subtraction using integers only:

42+43, 41+44, 40+45, 39+46, etc

86-1, 87-2, 88-3, 89-4, etc

Then there are fractions:

42.1+42.9, 41.1+43.9, 40.1+44.9, etc

and

42.2+42.8, 41.2+43.8, etc

also

42.01+42.99, etc.

Then there are multiplications and divisions.

And all these are binary operations - using two numbers to male 85. I could use 3 numbers: 1+1+83 etc, or 4 numbers etc.