8th Grade Math Review

rational number : a number that can be expressed as a ratio (fraction) of two integers - terminating and repeating decimals are considered rational

irrational number : Any real number which cant be expressed as a fraction of two integers

slope-intercept form : y=mx+b

undefined : Denominator equals zero

line of best fit : the most accurate trend line on a scatter plot showing the relationship between two sets of data

slope : A measure of the steepness of a line. Given two points with coordinates (X1,Y1) and (x2,y2) on a line the slope, m, of the line is given m = rise/run= y2-y1/x2-x1

perfect square : a square of a whole number

real number : All rational and irrational numbers

median : The middle number in the set (if two numbers are in the middle, find the average of the two numbers)

mode : Most

input : Data that is to be entered into a worksheet

output : Data that has been processed into a useful format.

radius : A straight line from the center to the circumference of a circle or sphere.

perimeter : The distance around a figure

scatter plot : A graph with points plotted to show a possible relationship between two sets of data.

negative correlation : A finding that two factors vary systematically in opposite directions, one increasing as the other decreases.