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bagirrra123 [75]
3 years ago
11

On a certain airline, passengers can make calls from telephones provided ny the airline. A call cost $3 to connect plus $2.50 fo

r each minute. Which equation best represents c, the total cost for a call that lasts m minutes?
m=2.5+3m

m=3+2.5c

c=3+2.5m

c=2.5+3m
Mathematics
2 answers:
sasho [114]3 years ago
8 0
Answer:

C=3+2.5m

Explanation:
Finger [1]3 years ago
5 0

Answer: The answer is D

Hope this helps

Step-by-step explanation:

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A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Portland. The stu
iVinArrow [24]

Answer:

-0.061 < P_1 -P_2< 0.025

Step-by-step explanation:

Give data:

n_1 = 350

n_2 =250

x_1 = 23

x_2 = 21

\hat{P} 1 = \frac{x_1}{n_1} = \frac{23}{350} = 0.066

\hat{P} 2 = \frac{x_2}{n_2} = \frac{21}{250} = 0.084

for 95% confidence interval

\alpha = 1 - 0.95 = 0.05 and \alpha/2 = 0.025

z_{\alpha/2} = 1.96  from standard z- table

confidence interval for P_1  and P_2 is

\hat{P} 1 - \hat{P} 2 \pm z_{\alpja/2} \sqrt{\frac{\hat{P} 1(1-\hat{P} 1)}{n_1} +\frac{\hat{P} 2(1-\hat{P} 2)}{n_2}}

(0.066 - 0.084) \pm 1.96 \sqrt{\frac{0.066(1-0.066)}{350} +\frac{0.084(1-0.084)}{250}}

-0.018 \pm 0.043

confidence interval is

-0.018 - 0.043 < P_1 -P_2

-0.061 < P_1 -P_2< 0.025

7 0
3 years ago
What is the radius of a circle that has a circumference of 81 π square inches?
ira [324]

Answer:

r≈12.89

Step-by-step explanation:

Using the formula

C=2πr

Solving for r

r=C

2π=81

2·π≈12.89155

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3 years ago
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Yes , I agree w them I’m gonna go with the answer D.
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