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10 votes
For her cell phone plan, Heather pays $30 per month plus $0.05 per text. She wants to keep her bill under $60 per month. Which inequality represents the number of texts, t, Heather can send each month while staying within her budget?

2 Answers

2 votes

The monthly cost is

30+0.05n

if we call the number of texts n.

Heather wants to keep this less than 60, so the inequality is:

30+0.05n<60

Step-by-step explanation:

Note that we can also subtract

30

from each side:

0.05n<30

We can also divide both sides by

0.05:n<600

This is the most useful inequality since it tells Heather she needs to send fewer than 600 texts per month or about 20 per day.

User Wenlong
by
4.5k points
3 votes

Answer:

Step-by-step explanation:

30 + .05t < 60

If you need it solved,

30 + .05t < 60

.05t < 30

t < 600

User Wanaryytel
by
4.4k points