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IrinaVladis [17]

1 year ago

6

For her phone service, Charmaine pays a monthly fee of $15, and she pays an additional $0.05 per minute of use. The least she ha

s been charged in a month is
$66.90.
What are the possible numbers of minutes she has used her phone in a month?
Use m for the number of minutes, and solve your inequality for m.

1 answer:

Tamiku [17]1 year ago

3 0

Step-by-step explanation:

after subtracting the monthly fee (which she has to pay, even if she does not make a single call) we have

66.9 - 15 = $51.90

for actual phone call minutes.

1 minute is $0.05

so, in the month with the lowest charge she had used

51.9 / 0.05 = 1038 minutes for calls.

since this was the minimum, for all the numbers of minutes m she used in a month we have

m >= 1038 minutes

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3 years ago

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Answer:

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Step-by-step explanation:

Given

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$T_5 = 160$

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$\frac{T_7}{T_5} = \frac{40}{160}$

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Where n is the nth term

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Substitute the above expression in equation 1

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$r = \sqrt{\frac{1}{4}}$

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By substituting 160 for T5 and ± $\frac{1}{2}$ for r;

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Recall that the formula of a GP is

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So,

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$T_6 =$ ±80

Hence, the 6th term is positive/negative 80

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