A.) There are many different expressions that can be equivalent to 4/2 and -2/3, but you just need one expression. 4/2 is equivalent to 2/1 and -2/3 is equivalent to -4/6.
Reason:
There are two ways you can find a fraction equivalent to another.
1.) First one is by reducing the fraction if possible.
Example: 5/10=1/2, 10/30=1/3, 9/16=3/4.
2.) The second one is by multiplying the numerator and the denominator by the same number, usually by 2 or 3.
Example: 1/2 x 2/2 = 2/4, so 1/2= 2/4. Another: 1/3 x 3/3 = 3/9, so 1/3=3/9
That said, 4/2 = 2/1 because it was reduced. While -2/3 = -4/6 because it was multiplied by 2/2.
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