Yes, it matters, if it is recurring or simply just irrational <span />
Answer:
19 mm
Step-by-step explanation:
A penny is not that large, and you can fit multiple pennies in the palm of your hand. This means that the only reasonable measurement is 19 mm, (& 8 cm, but that is only if you have really large hands). Therefore, (A) is your choice.
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Yes you did those two correctly
For #8, it's approximately 2.5