Answer:
.01%*
Step-by-step explanation:
Individually, they both have a rate of failure of 1%.
.01 x .01 = .0001
Therefore they have a combined probability of failure of .01%
*Disclaimer!!
I am not the best at this area in math so I would still reference against someone else's answer, but this is my best effort :)


No, since 0 doesn't belong to the domain.
A benefit is the technology can be more aaurate and you can use a compass and a straightedge wrong and get lost. Also the compass can break