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ozzi
3 years ago
10

This is the call plan for minna's cell phone $15 a month plus free texts plus &0.20 per minute of call time minna made 30 mi

nutes of calls this month and 110 texts how much does she have to pay he phone company
Mathematics
1 answer:
Alja [10]3 years ago
7 0
$21 I'm really sorry if this is wrong but this is what I got
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A set of equations is given below: Equation A: q = 4r + 1 Equation B: q = 3r + 5 Which of the following is a step that can be us
Sergio039 [100]
Hi

The correct option is 4r + 1 = 3r + 5
-------------------------------------------------------

Because you need to solve q = 4r + 1 for q . After that, you'll have to substitute 4r + 1 for q in q = 3r + 5


Good luck! 
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3 0
3 years ago
The initial temperature of a cup of tea is 200ºF. The surrounding temperature is 70ºF, and the value of the constant k is 0.6. A
Mazyrski [523]
Newton's cooling model is ΔT = ΔTo * e ^ (-k t)

ΔTo = 200°F - 70°F = 130°F

k = 0.6

t = 2 hours

=> ΔT = 130 * e ^ (-0.6 t) = 130 * e^ (-0.6 * 2) = 130 * e ^ (-1.2)

ΔT = 39.15°F

ΔT = T - Tenvironment => T = ΔT + Tenvironment = 39.15°F + 70°F = 109.15°F ≈ 109 °F.

Answer: T = 109 °F


8 0
3 years ago
A medical website states that 40% of U.S. adults are registered organ donors. A researcher believes that the proportion is too h
alexgriva [62]

Answer:

Pvalue = 0.193

There is not enough evidence to conclude that the proportion of registered organ donors is less than 40%

Step-by-step explanation:

H0 : p = 0.4

H1 : p < 0.4

Test statistic :

z=pˆ−p/√p(1−p)/n

pˆ = 74 / 200 = 0.37

Z = (0.37 - 0.40) / √(0.40(1 - 0.40) / 200

Z = - 0.03 / √0.0012

Z = - 0.03 / 0.0346410

Z = - 0.866

Test statistic = -0.866

The Pvalue :

P(Z < -0.866) = 0.193

α - level = 0.05

If Pvalue < α ; Reject H0

Since Pvalue > α ; There is not enough evidence to conclude that the proportion of registered organ donors is less than 40%

3 0
2 years ago
Which situation can be simulated by rolling a six-sided die once?
AleksandrR [38]

Answer:

A. Selecting one person from a group of four boys and two girls.

Step-by-step explanation:

A dice has six sides and here we have six people we're trying to choose from. If each person is assigned a number on the dice rolling the dice once will pick out of the six of them.

8 0
2 years ago
Read 2 more answers
Mr. Dewalt suggested contacting a travel agent to see whether they could get a lower price. The agent found a price that was 30%
Dennis_Churaev [7]
First you have to know, that the price the agent found is 70% of  $2075
 (100%-30%=70%)
70%=0,7
$2075 * 0,7 = $1452,5
So 70% 0f $2075 is 1452,5

The price the agant found is $1452,5.
5 0
3 years ago
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