What do the variables in the formula represent

A variable represents a concept or an item whose magnitude can be represented by a number, i.e. measured quantitatively. Variables are called variables because they vary, i.e. they can have a variety of values. Thus a variable can be considered as a quantity which assumes a variety of values in a particular problem.

In mathematics, a variable is a symbol used to represent an arbitrary element of a set. In addition to numbers, variables are commonly used to represent vectors, matrices and functions.

The letters that represent variables and numbers are usually lowercase: a, b, c, and so on. Capitalized letters are used most commonly to represent the answer in a formula; for example, the capital A for area of a circle equals pi times the radius squared, A = πr².

Hope this helps!

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

the answer is 31.27mph