A ratio is a relationship between two numbers indicating how many times the first number contains the second. For example, if a bowl of fruit contains eight oranges and six lemons, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is
equivalent to the ratio 4:3).
A rational function is any function which can be defined by a rational fraction, i.e. An algebraic fraction such that both the numerator and the denominator are polynomials. The coefficients of the polynomials need not be rational numbers /
they may be taken in any field
Rational number is any number that can be expressed as the quotient or fraction p / q of two integers, a numerator p and a non-zero denominator q. Since q may be equal to 1, every integer is a rational number. A real number that is not rational is called
irrational.
A number line is a picture of a graduated
straight line that serves as abstraction for real numbers, denoted by. Every point of a number line is assumed to correspond to a real number, and every real number to a point.
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a set of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of
length.
Rectilinear motion is another name for straight-line motion. This type of motion describes the movement of a particle or a body. A body is said to experience rectilinear motion if any two particles of the body travel the same distance along two
parallel straight lines.
Recursive function, in logic and mathematics, a type of function or expression predicating some concept or property of one or more variables, which is specified by a procedure that yields values or instances of that function by repeatedly applying a given relation or routine operation to known values of the function
Linear Regression. A linear regression line has an equation of the form Y = a + bx, where X is the explanatory variable and Y is the dependent variable. The slope of the line is b, and a is the intercept (the value of y when x = 0).
Relation definition. A relation between two sets is a collection of ordered pairs containing one object from each set. A function is a type of relation. But, a relation is allowed to have the object in the first set
to be related to more than one object in the second set.
A 360° angle, a full rotation, a complete turn so it points back the same way. Often used in the phrase "Revolutions Per Minute" (or "RPM") which means how many complete
turns occur every minute.
In mathematics, a saddle point or minimax point is appointing on the surface of the graph of a function where the slopes (derivatives) in orthogonal directions are all zero (a critical point), but which is not a local extremum of the function.
A scalar is a real number. We often use the term scalar in the context of vectors or matrices, to stress that a variable such as is just a real number and not a vector or
matrix.
Scalar multiplication is the multiplication of a vector by a scalar (where the product is a vector) and must be distinguished from inner product of two vectors (where the product is a scalar).