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Tpy6a [65]
3 years ago
10

Can someone tell me if this is right thanks

Mathematics
2 answers:
andreyandreev [35.5K]3 years ago
7 0

bearing in mind that an absolute value expression is in effect a piece-wise expression, because it has a ± version.


\bf 3|x|+7=28\implies 3|x|=21\implies |x|=\cfrac{21}{3}\implies |x|=7\implies  \begin{cases} +(x)=7\\ -(x)=7 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ +(x)=7\implies \boxed{x=7}~\hfill  -x=7\implies \boxed{x=-7}

saveliy_v [14]3 years ago
3 0

Yeah because 31x1+7-7=28-7=21

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3 years ago
Here are the monthly charges for Jo's mobile phone
yaroslaw [1]

Answer:

The correct answer is - 625.36.

Step-by-step explanation:

Given:

Fixed mothly plan - 616

free minutes - 150

Used minutes - 170

Free text - 150

Used text - 182

Charging amount over free limit - 18p

Solution:

Number of minutes over the limit -  170 - 150 = 20

Number of text over the limit - 182 - 150 = 32

So the extra amount that will be add to the monthly charge would be -

(20*0.18) +(32*0.18)

and the total charge of the month would be -

= 616+(20*0.18) +(32*0.18)

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Thus, the correct answer would be - 625.36

5 0
3 years ago
What is the relationship between the two ratios?
antoniya [11.8K]
10/14 = 5/7
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answer
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4 0
3 years ago
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How do i write a Word phrase to represent the numerical expresion 5+(17-8)
Lerok [7]

Answer:

If i was to read this out loud, i would say: 5 plus the quantity of 17 minus 8.

Step-by-step explanation:

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Parenthesis need to be done first! That is why you need to say 'the quantity of...' You also have to add 5 to it all, and you might as well do it before 'the quantity of...' becuz it comes before it in the numerical expression.

YAY! ! ! YOU GOT IT!!! =)

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Answer:

Step-by-step explanation:

81x² - 6x

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