Which of the following are true about the correlation coefficient r? select one or more:

if the correlation coefficient is +1, then the slope of the regression line is also +1.

the correlation coefficient is always greater than 0.

if the correlation coefficient is close to 0, that means there is a strong linear relationship between the two variables.

the correlation coefficient will change if we change the units of measure.

the correlation coefficient is always between -1 and +1.

if the correlation coefficient is positive, the slope of the regression line will also be positive.

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.

Find the measure of angle a in the following triangle