Mr. Valentine made a scatter plot with his students' homework averages on the x -axis and their test score averages on the y -axis. He calculated the equation of the line of best fit as y=0.9x+12 , with x and y as scores from 0 to 100. Joseph, one of Mr. Valentine's students, had a homework average of 80 and a residual of 3.

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Write the expression 7x^3-28xy^2 as the product of 3 factors