Arecent study claimed that in any given month, for every 5 text messages a boy sent or received, a girl sent or received 7 text messages. is the relationship between the number of text messages set or received by boys proportional to the number of texts sent or received by girls.
is it proportional?

Yes, it is a proportional relation.

Step-by-step explanation:

Given,

5 text messages a boy sent or received = 7 text messages a girl sent or received,

⇒ 1 text message of a boy = text messages of a girl,

So, x text messages of a boy = text messages of a girl,

Let y represents the text messages of a girl for the x text messages of a boy,

Which is a line,

∵ At (0,0),

 ( True ),

Thus, line passes through the origin,

Hence,

shows a proportional relation.

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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