4x-7= 4x-8
Move +4x to the left side. Sign changes from +4x to -4x
4x-4x-7= 4x-4x-8
-7= 0-8
-7= -8
Answer : no solution
First find x in terms of f(x)
1/2 x = f(x) + 4
x = 2(f(x) +4)
x = 2f(x) + 8
Now replace x by the inverse function f-1(x) and the f(x) by x
f-1(x) = 2x + 8
f-1 (4) = 2(4) + 8 = 16
Slope: 5/1 (5 if simplified)
y-intercept: 10
Answer:
1. The sum of the residuals is always close to zero.
2.The coefficient of determination measures how much of the variation in the y-values is explained by the regression line.
3. In the equation of the least-squares regression line, y hat is a predicted value when x is known
Step-by-step explanation:
The least square regression line is a line that makes distance from data points to the regression line to be as minimal as possible. This line is a best fit for the data points. Let's say we have a collection of numbers and a scatter plot, this line is a line that exists and best fits the data.
Therefore, the least square regression line minimizes sum of squared error to be close to zero. R² measures the extent to which variations in the value of y is explained by the regression line. In the equation of this line, y hat is a predicted value when x is known.
Answer:
160
Step-by-step explanation:
480 divided by 3= 160