Answer:
a

b

Step-by-step explanation:
From the question we are told that
The mean value is 
The standard deviation is 
Considering question a
The sample size is n = 9
Generally the standard error of the mean is mathematically represented as

=>
=> 
Generally the probability that the sample mean hardness for a random sample of 9 pins is at least 51 is mathematically represented as



=> 
From the z table the area under the normal curve to the left corresponding to 2.5 is

=> 
=> 
Considering question b
The sample size is n = 40
Generally the standard error of the mean is mathematically represented as

=>
=> 
Generally the (approximate) probability that the sample mean hardness for a random sample of 40 pins is at least 51 is mathematically represented as

=> 
=> 
From the z table the area under the normal curve to the left corresponding to 5.2715 and
=> 
So

=> 
Answer:
2) No function
3) Function: y=30x
Domain: x≥0
Range: y≥0
4) Function: y=160
Domain: x≥20
Range: y=160
Step-by-step explanation:
Answer:
IN THE EXPLANATION!!
Step-by-step explanation:
income tax. Capital gains tax is a tax on the sale of an investment, usually stocks, bonds, precious metals and property.
Payroll tax. FICA tax is a tax levied in the United States to fund Social Security and Medicare. ...
Property taxes. Most property taxes charge for both the value of the land and the value of any buildings or other improvements on the land.
Consumption taxes. A general tax refers to a tax that applies to all or most goods and services and where all are taxed at the same rate.
you should go make new friends because you
are lonely and have no friends
Answer:
trapezoid
Step-by-step explanation:
y = 4x slope = 4
y' = 4x -16 slope = 4
TA // OM
TA: -1 ≤ x ≤ 0 (limited value)
OM: 3 ≤ x ≤ 5
TA and OM limited in different range, their length is not equal
The shape is a trapezoid