Yin's cellphone plan costs $30 a month. she used 12.5 hours in may. what was her cost per minute

cost per minute is 0.04

Step-by-step explanation:

Unit rates defined as the rates are expressed as a quantity of 1  such as 2 feet per second or 5 miles per hour they are called unit rates.

Given: Costs = $ 30 a month

In a month of may she used cellphone 12.5 hours.

First convert 12.5 hours in minute.

Use conversion: 1 hour = 60 minutes

then, 12.5 hours =

to find the cost per minute.

by definition;

unit rate(cost per minute ) = cost per minute.

therefore, her cost per minute is 0.04

  y= -3x is the required function.

step-by-step explanation:

we have been given a table:

x             y

0             0

1             -3

3             -9

-2             6

we can see that the values of y is -3 times the value of x

hence, the function would be: y= -3x.

put the values of x will give the same y as in the table that means function is satisfying the given table.