The answer is b because 95 confidence is interval for the mean lifespan
Answer:
=> Apply law of cosine

=> input value

=> simplify

=> calulcation

=> apply rule: Distance must be greater than 0
which is about 14.51828
An expression with 18 and 20.
An expression does not have an equal sign.
18+20
Hope I helped.
.93 would have to be the answer because you do the regular calculations, then you divide to find y.