Infinitely many.
Here are two examples:
150*0.2
15.47 + 59.53
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Three ways.
A quarter, a nickel, a dime, and a penny is only 41 cents ... not enough to make 75 cents in even one way.
There are an infinite number of ways of expressing 75 as a fraction: 75/1, 150/2, 225/3, 300/4, and so on ad infinitum.
There are 18.
7.5 can be written an infinite number of ways; e.g. 75/10; 750/100; 7500/1000 along with many other ways.