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bazaltina [42]
2 years ago
6

Your cellphone company charges a $18 monthly fee, plus $0.11 per minute of talk time. One month your cell phone bill was $70.80.

How many minutes did you spend talking on the phone that month?
Mathematics
2 answers:
Eduardwww [97]2 years ago
8 0

Answer:

480 minutes

Step-by-step explanation:

We can write this relationship as y=0.11x+18 and then solve for x when y=70.80:

y=0.11x+18\\\\70.80=0.11x+18\\\\52.80=0.11x\\\\480=x

Therefore, you spent 480 minutes talking.

NemiM [27]2 years ago
5 0

Answer:

480 minutes would be the answer

Step-by-step explanation:

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3c+8=14 linear equation solve for variable​
slava [35]

Answer:

c=2

Step-by-step explanation:

3c+8=14

subtract 8 from both sides

3c=6

divide both sides by 3

c=2

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3 years ago
I don't understand how to put anything into standard form. If anyone could help please that'd be great.
Norma-Jean [14]
I think you would distribute what is in the parentheses and then make it so only a and b are on the left and i and the other characters that can be simplified are on the left but feel free to Google it.
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I will mark either the best or the first answer brainliest.
posledela

Answer:

11.x=16 12.x=37

Step-by-step explanation:

11.

20^2-12^2=x^2

256=x^2

x=√256

x=16

12.

13^2-5^2=y^2

144=y^2

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y^2+35^2=x^2

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3 years ago
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7 0
2 years ago
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Erica can paint her room 5 hours .If she had her friend Rachel help her , they can paint the room together in 3 hours .How long
LUCKY_DIMON [66]

Answer:

7 hours 30min

Step-by-step explanation:

Step one :

Given data

We are told that Erica can paint 1 room in 5hours

Her work rate is 1/5 room per hour

And also with the assistance of her friend they can paint 1 room in 3 hours

Hence their combined work rate is 1/3 room per hour

Step two

The combined work expression is

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Where A=Erica's work rate

B=Rachael's work rate

T=combined work

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1/B=1/3-1/5

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1/B=2/15

B=15/2

B=7.5 hours

It will take Rachel 7 hours 30min to paint the room

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