Answer:
y = 36x
Step-by-step explanation:
Given that x and y vary directly then the equation relating the is
y = kx ← k is the constant of variation
To find k use the condition x = 
, y = 12, then
k = 
= 
= 12 × 3 = 36
y = 36x ← equation of variation
Answer:
Step-by-step explanation:
The area = 252 in²
One side = 14 in
The other side = x
The area of a rectangle is a product of 2 sides
- 14x = 252
- x = 252/14
- x = 18 in
Answer:
14.4
Step-by-step explanation:
Answer:
in number 1 I think D is wrong and in number 2 A is correct
Answer:
94% confidence interval for the average length of time a computer fan will run before it needs to be cleaned is between 866.6 and 885.4 hours
Step-by-step explanation:
94% confidence interval can be calculated using M±ME where
- M is the sample average length of time before it needs to be cleaned. (876 hours)
- ME is the margin of error from the mean
margin of error (ME) around the mean using the formula
ME=
where
- z is the corresponding statistic in the 94% confidence level (1.88)
- s is the standard deviation of the time periods before it needs to be cleaned (30 hours)
- N is the sample size (36)
Using the numbers we get ME=
=9.4
Then the 94% confidence interval is 876±9.4
