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Mnenie [13.5K]
3 years ago
8

A cell phone company charges $40 per month for unlimited calling, and $0.20 per text message sent. If t represents the number of

text messages Roxy sent last month, which expression represents the cost of her bill last month before any taxes or additional fees?
Mathematics
2 answers:
Alona [7]3 years ago
7 0
We know that 40$ is a constant and the number of texts sent (t) will change the price therefire we can plug it in the basic linear equation (p being the total price): p= 0.2t + 40
Lemur [1.5K]3 years ago
7 0

Answer:

40+0.2t

Step-by-step explanation:

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Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are
schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012

The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

E=\#weeks*P(S>120)=52*0.09012=4.68

The nearest answer is C. 5 weeks.

6 0
3 years ago
34.98+12.24=?<br>answers please​
Ksivusya [100]

Answer:

Hello!

After reading your question I have calculated the correct answer to be:

47.22

Step-by-step explanation:

The way I solved this equation was I first split the equation into two parts.

I took the two whole numbers, being "34" and "12", and made their own equation:

"34+12=?"

And then I took the two partial numbers "0.98" and "0.24" and made their own equation:

"0.98+0.24=?"

I then solved both equations:

"34+12= 46"

"0.98+0.24= 1.22"

And added those two solutions together to come up with the final solution:

"46+1.22= 47.22"

Hope this helped!

6 0
2 years ago
PLZ HELP DUE soon x 2/3
sergiy2304 [10]

Answer:

I think the answer is 2. Hope this helps!

7 0
3 years ago
Please complete these problems before we meet at 10 am. I want you to be able to explain to me how you got each answer. SHOW YOU
allsm [11]

Answer:

ano pong language ito?

Step-by-step explanation:

Step-by-step explanation:

6 0
3 years ago
Which sequence shows the numbers in order from least to
cestrela7 [59]

Answer:

D

Step-by-step explanation:

Just did it

6 0
3 years ago
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