Answer:
32/9
Step-by-step explanation:
Answer:
x=4
Step-by-step explanation:
5-3x=-7
1) you subtract the 5 from both sides
-3x=-12
2) then you divide both sides by -3
x=4
Answer:184161240771
Step-by-step explanation:
Calculator
Answer:
(48.3875, 51.6125)
Step-by-step explanation:
At 99% level of significance


From the normal standard deviation table 
Considering that
±
=50±
50±2.33(0.625)=50±1.6125=(48.3875, 51.6125)
Therefore, there’s 99% confidence that the mean lifetime of a certain brand of tires is between 48.3875 and 51.6125