Question

type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.
karan subscribes to a text - messaging service on his cell phone. his monthly bill for the service is given by the equation b = 0.25t, where b is the bill amount and t is the number of texts.
the constant of proportionality in terms of cost per text is

Explanation:

Step1: Identify the proportionality - equation form

The equation for direct - proportionality is $y = kx$, where $k$ is the constant of proportionality.

Step2: Compare with given equation

The given equation is $b = 0.25t$. Here, $b$ is like $y$ and $t$ is like $x$. So the constant of proportionality $k = 0.25$, which represents the cost per text.

Answer:

0.25