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Savatey [412]
3 years ago
7

The difference between the square roots of a number is 30

Mathematics
1 answer:
raketka [301]3 years ago
4 0

The two square roots of any positive number have the same size,
but one is positive and the other one is negative.

Let's say the square roots of our mystery number are +S and -S .
Then the difference between them is

                                     +S - (-S)  =  +S + S  =  2S .

We are told that the difference between them is 30 .

                                             2S  =  30

Divide each side by  2:      S  =  15

The positive square root of our mystery number is 15.

Our mystery number is  (15)² = 225 .

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The expression that can be used to represent the list price of the smartphone is 5179.99 * (1- 25%) and the value is 3884.9925

<h3>What expression can be used to represent the list price of the smartphone? </h3>

The given parameters are:

Discount = 25%

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The expression that can be used to represent the list price of the smartphone is

Expression = Sales price * (1- discount)

So, we have:

Expression = 5179.99 * (1- 25%)

Evaluate

Expression = 3884.9925

Hence, the expression that can be used to represent the list price of the smartphone is 5179.99 * (1- 25%) and the value is 3884.9925

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1 year ago
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