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TrueKing184
17.10.2019 •
Mathematics
Afather is 1 year older than 3 times the age of his son the son is 20 years old
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Ответ:
1 + 3x
= 1 + 3(20)
= 1 + 60
= 61
so father's age = 61
son's age = 20
Ответ:
(a)![y=-0.493x^{2}+23.380x+996.029](/tpl/images/0706/7736/9e4f5.png)
(b) The soil density of a sample at a depth of 20 m is 1266.43 kg/m³.
Step-by-step explanation:
The data provided is:
Depth (m): {1, 5, 6, 8, 10, 12, 14, 21, 23, 24, 28}
Soil density (kg/m³): {1045, 1063, 1102, 1140, 1191, 1232, 1249, 1254, 1265, 1268, 1273}
(a)
Use Excel to form the quadratic regression equation.
Enter the data in Excel.
Compute the value of X².
Go to Data → Data Analysis → Regression
Select the values accordingly.
In the X range select both values of X and X².
Click OK.
The output is attached below.
The quadratic regression equation is:
(b)
Compute the value of y if x = 20 m as follows:
Thus, the soil density of a sample at a depth of 20 m is 1266.43 kg/m³.