give them an example

absolute value – the distance of a number from zero on a number line
area of a rectangle – the product of the length and the width
perimeter – the boundary of or distance around a polygon

slope – the ratio of the vertical change to the horizontal change between two points on a line

give them all an example

absolute value – The absolute value of -5 is 5 because -5 is 5 units away from zero on the number line.

area of a rectangle – If a rectangle has a length of 4 units and a width of 3 units, the area would be 4 x 3 = 12 square units.
perimeter – If a square has a side length of 6 units, then the perimeter would be 6 + 6 + 6 + 6 = 24 units.
slope – If two points on a line are (2, 3) and (4, 7), the slope would be (7-3)/(4-2) = 4/2 = 2.