The answer is 4/12
That easy
No they are not all rational numbers
You could make this really simple by dividing 300 by 4 to see how much 1/4 of that is and then subtracting 1/4 from 300 to see how much dashawn's water bottle holds.
300/4 =75 so 1/4 is equal to 75 mL
300-75=225mL
Dashawn's water bottle holds 225mL
Probably you are supposed to compute

Factorize the numerator and denominator, then simplify:
Answer: We agreed with this.
Step-by-step explanation:
Since we have given that

As we know that



So, 
Hence, we agreed with this.