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Zigmanuir [339]
2 years ago
13

A local cell phone company offers two different calling plans. In the first plan, you pay a monthly fee of $30 and $.35 per minu

te. In the second plan, yoy pay a monthly fee of $99 and $.05 per minute. Write a system of equations showing the two calling plans.
Mathematics
1 answer:
Svetach [21]2 years ago
4 0
A local cell phone company offers two different calling plans. In the first plan, you pay a monthly fee of $30 and $.35 per minute. In the second plan you pay a monthly fee of $99 and $.05 per minute. 
<span>a. write a system of equations showing the two calling plans. </span>
<span>scheme 1: monthly charges: 30 + 0.35m .....m = total minutes during the month </span>
<span>scheme 2: monthly charges: 99 + 0.05m </span>

<span>b. when is it better to use the first plan </span>
<span>When you make few calls, only where unavoidable. </span>

<span>c. when is it better to use the second plan. </span>
<span>When you make a lot of call, literally "always on hello!" </span>

<span>d. how much does it cost when the calling plans are equal? 
Question is unclear for me . </span>
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3 years ago
Answer...........................
Usimov [2.4K]

Answer:

9.9 years

Step-by-step explanation:

A = P e ^(rt)

Where A is the amount in the account

P is the amount invested

R is the interest rate

t is the time

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r =7% = .07

A = 17000

Substituting into the equation

17000=8500 e^(.07t)

Divide each side by 8500

17000/8500=8500/8500 e^(.07t)

2 = e^(.07t)

Take the natural log of each side

ln (2) = ln e^(.07t)

ln(2) = .07t

Divide each side by .07

ln(2)/.07 = .07t/.07

ln(2)/.07 = t

9.902102579=t

Rounding to one decimal place

9.9 years

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3 years ago
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Thank you so much. (20 characters required)
padilas [110]
#3.
 √18²-5.7²    Second Choice

#4
l²=5²+4² = 25+16 = = 41
l=√41
l= 6.4

Second Choice

#5 Only A --- First choice

#7 6 ----- Third choice

#8 V= \pi r^2(h)=  \pi 10^2(3) = 314(3)=942  units³ ---Second choice


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ollegr [7]

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C

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