* Answer all, get brainiest. 10 points per question.

Vodafone is charging a flat fee of $90 per month regardless of calling time. Let C1 be the Vodafone monthly cost. Express the monthly cost in the equation. Start with C1=

A. C1=90*m
B. C1=90
C. C1=m+90

Let's examine Telefónica which is charging $50 per month and additional 20 cents fee per minute of calling time. Let C2 be the monthly cost in dollars at Telefónica and m - minutes spend on the phone. Write an equation to model monthly cost. TIP: Do not forget to turn cents into dollars. Start with C2= *

A. C2=50+20m
B. C2=50+0.20m
C. C2=50*20m

With these 5 hours of calling time in mind, calculate and show the cost of phone service for Vodafone

A. C1=90*5=$450 (very expensive plan!)
B. C1=90 (cost stays the same at $90 regardless of usage)
C. C1=90+minutes

And now calculate and show the monthly cost for Telefónica with 5 hours of calling time in mind. Do not forget to convert hours into minutes *

A. C2=$50
B. C2=50+0.20*5=$51
C. C2=50+0.20*300=$110

Which plan works best for Kira? Why?

Is there a point (in terms of minutes) when the monthly cost is the same for both phone companies? Explain