Understanding Cell Phone Plan Costs

The video tutorial explains how to compare two cell phone plans, Plan A and Plan B, based on their cost structures. Plan A charges 33 cents per minute, while Plan B charges 15 cents per minute plus a $9.50 flat fee. The tutorial guides viewers through setting up and solving an inequality to determine the number of minutes at which Plan B becomes less expensive than Plan A. The solution reveals that Plan B is cheaper when more than 52.8 minutes are used, which is rounded up to 53 minutes.

What is the cost per minute for Plan A?

• 9.50 dollars

• 50 cents

• 33 cents

• 15 cents

Tags

CCSS.8.EE.B.5

What additional cost does Plan B have besides the per-minute charge?

• No additional cost

• A flat fee of $9.50

• A flat fee of $5.00

• A flat fee of $15.00

Tags

CCSS.8.EE.B.5

Which equation represents the cost of Plan B?

• C = 0.15m

• C = 0.50m + 5.00

• C = 0.15m + 9.50

• C = 0.33m

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CCSS.7.EE.B.4B

What is the inequality used to determine when Plan B is cheaper than Plan A?

• 0.15m + 9.50 > 0.33m

• 0.15m + 9.50 < 0.33m

• 0.33m < 0.15m + 9.50

• 0.33m > 0.15m + 9.50

What is the first step in solving the inequality for Plan B?

• Add 0.15m to both sides

• Multiply both sides by 0.18

• Subtract 0.15m from both sides

• Divide both sides by 0.18

Tags

CCSS.6.EE.B.8

What is the result of dividing both sides of the inequality by 0.18?

• m is less than or equal to 52.8

• m equals 52.8

• m is greater than 52.8

• m is less than 52.8

Tags

CCSS.6.EE.B.8

Why do we not reverse the inequality symbol when dividing by 0.18?

• Because 0.18 is negative

• Because 0.18 is zero

• Because 0.18 is a fraction

• Because 0.18 is positive

What is the minimum number of minutes needed for Plan B to be cheaper than Plan A?

• 54 minutes

• 55 minutes

• 53 minutes

• 52 minutes

Why must the number of minutes be rounded up in the final answer?

• Because minutes cannot be fractional

• Because it is easier to calculate

• Because it simplifies the equation

• Because it is a rule of thumb

Tags

CCSS.HSF.LE.B.5

What does the variable 'm' represent in the equations?

• Cost per minute

• Total cost

• Number of minutes

• Flat fee

Tags

CCSS.HSF.LE.B.5