Count : To count means to find out the number of objects by adding one for every object.

Number : A number $x$ is a mathematical symbol representing a quantity.

Divisible : An integer $x$ is called divisible by an integer $y$ if the division $x:y$ has a remainder of zero. For example 4 is divisible by 2 but 5 is not divisible by 2.

Divisible by 2 : An integer $x$ is called divisible by 2 if $x$ is a multiple of 2. An integer is divisible by 2 if and only if it is even.

Divisible by 6 : An integer $x$ is called divisible by 6 if $x$ is a multiple of 6. An integer is divisible by 6 if and only if it is even and the sum of its digits is divisible by 3.

Number : A number $x$ is a mathematical symbol representing a quantity.

Line : A line AB is a one-dimensional shape that includes the points A and B, all the points on the line segment in between A and B and all the points of the straight extension of the line segment beyond A and B. A line does not have an endpoint.

Linear : Linear means in a way that can be described by a combination of addition and scalar multiplication. See also linear function, linear equation and linear combination.

Negative : A number is negative if it is $\lt 0.$

Positive : Positive means $\geq 0.$

Scatter plot : A way to visualize the dependency realtionship between two variables. Every common outcome of the two variables is plotted as a point in the coordinate system by having the x-coordinate of the point equal to the outcome of the first variable and the y-coordinate of the point equal to the outcome of the second variable.

Variable : A letter in an expression or function that represents an arbitrary number.