Alex purchased a 6-hour calling card. he has used t minutes of access time. wrote an algebraic expression to represent how many minutes he has remaining and identify the units for the expression.

and the  units for the expression is minutes.

Step-by-step explanation:

Given : Alex purchased a 6-hour calling card.

Since , 1 hour = 60 minutes.

Then,

He has used t minutes of access time.

Then , the algebraic expression to represent the number of minutes he has remaining :_

The units for the expression is minutes.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x