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3 years ago

Cell phone Plan A costs $70 per month and comes with a free $500 phone. Cell phone Plan B costs

Mathematics

1 answer:

Agata [3.3K]3 years ago

8 0

Answer:

25 Months

Step-by-step explanation:

Let's make the equations first,

Plan A: 70x Plan B: 50x+500...

Now we make it into an equivalent equation:

70x=50x+500...

Then we solve:

70x=50x+500-50x -50x20x=500...

÷20 ÷20x=25...

To check if it's correct, we just plug it in:

70(25)=50(25)+500...

1750=1750...

Brainliest Answer please? Hope this helps! Good luck!

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The SAT Reasoning Test (formerly called the Scholastic Aptitude Test) is perhaps the most widely used standardized test for coll

slamgirl [31]

Answer:

The score is $x = 1884$

Step-by-step explanation:

From the question we are told that

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The standard deviation is $\sigma = 300$

From the question we are told that the score follow a normal distribution

i.e $X \~ \ N( 1500 , 300)$

The proportion of score in the top 10% is mathematically

$P(X > x ) = P( \frac{X - \mu}{\sigma } > \frac{x - \mu}{\sigma } ) = 0.10$

Where x is the minimum score required to be in the top 10%

Now the $\frac{X - \mu}{\sigma } = Z (The \ Standardized \ value \ of \ X)$

$P(X > x ) = P( Z > \frac{x - \mu}{\sigma } ) = 0.10$

$P(X > x ) = P( Z > \frac{x - 1500}{300} ) = 0.10$

So the critical value of 0.10 from the normal distribution table is $Z_{0.10} = 1.28$

$\frac{x - 1500}{300} = 1.28$

$x = 1884$

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3 years ago

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yKpoI14uk [10]

X = $ 52 for the 12 books Diego bought

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2 years ago

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NeX [460]

Answer:

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Step-by-step explanation:

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2 years ago

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Morgarella [4.7K]

The answer is umu( M + m )

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3 years ago

HELP!!

taurus [48]

Lets convert

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1h=3600s

$\\ \rm\longmapsto 1mph$

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If rounded

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2 years ago