6 - 2x = 18
2x = - 12
x = - 6
It should be 0.0849 because when you do this your just moving the decimal place two time
Answer:
We are given that The valve was tested on 150 engines and the mean pressure was 7.7 lbs/square inch.
We are also given that the valve was designed to produce a mean pressure of 7.6 lbs/square inch
So,
Null hypothesis:
Alternate hypothesis :
Since n > 30 and population standard deviation is given
So, We will use z test
Formula :
Substitute the values
refer the z table for p value
so, p value is 0.9927
Since it is a two tailed test So, p = 2(1- 0.9927) = 0.0146
α = 0.1
p value< α
So, we reject null hypothesis
Hence There is sufficient evidence at the 0.1 level that the valve does not perform to the specifications
Hi there!
Standard form is ax + by = c.
Now, we just need to simplify the equation enough so that we can get the answer:
y = -2/9x + 2
2/9x + y = 2
Since 2/9x + y = 2 is in standard form, it'd be the answer.
Hope this helps!