wait- i clicked the wrong question, sorry
Answer:
The first option is correct, 12/30 and 25/30
Step-by-step explanation:
To get common denominators, you need to find the GFC (greatest common factor) of 5 and 6, which is 30. Then you would need to make the fractions equal the same as the original fractions, by multiplying.
2/5 = ?/30 <- you can see that 30 is 6 times more than 5. so this means you multiply 2 by 6 to get 12. 12/30
5/6 = ?/30 <- you can see that 30 is 5 times more than 6. so this means you multiply 5 by 5 to get 25. 25/30
To answer this item, we are first to calculate the values of the length of this particular metal rod that is 0.045 cm less than the given,
Lower limit = 20.5 cm - 0.045 cm = 20.455 cm
Also, we calculate for the upper limit by adding 0.045 cm to the given length.
Upper limit = 20.5 cm + 0.045 cm = 20.545 cm
Thus, the answer to this item is D.