Leila purchased a pre paid phone card for $25. long distance calls cost 22 cents a minute using this card. leila used her card only once to make a long distance call. if the remaining credit on her card is $19.50 , how many minutes did her call last?

Leila's call lasted for 25 minutes.

Step-by-step explanation:

inital amount - (0.22 * minutes on the phone) = final amount

25 - 0.22x = 19.5

Solve for x

Subtract 25 from both sides

-0.22x = -5.5

Divide both sides by -0.22

x = 25

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

step-by-step explanation:

compare