What is a variable?

a.
a variable is an unknown number or value represented by a letter
c.
a variable represents a change in value
b.
a variable always represents the total amount
d.
a variable is always represented by the letter x

select the best answer from the choices provided

What are the sotions to the quadratic equation 9x^2=4

Given the median qr and trapezoid mnpo what is the value of x?

Which statement best explains whether the table represents a linear or nonlinear function? input (x) output (y) 2 5 4 10 6 15 8 20 it is a linear function because the input values are increasing. it is a nonlinear function because the output values are increasing. it is a linear function because there is a constant rate of change in both the input and output. it is a nonlinear function because there is a constant rate of change in both the input and output.