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3 years ago

Which expressions are differences of squares?

Mathematics

2 answers:

just olya [345]3 years ago

6 0

Here, Variable terms are squares in each option, so only two constants are perfect squares i.e., 4 and 169

In short, Your Answer would be: Option B & C

Hope this helps!

slamgirl [31]3 years ago

4 0

Answer:

Step-by-step explanation:

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At a video arcade, the action video games this week cost $25, which is 125% of last week's price. What was its price last week?

nalin [4]

First you can write it as 1.25 which it is the decimal version of the percent. Then write the 1.25x = 25. After divide both sides by 1.25. Ta da, You have your answer (which is 20).

8 0

3 years ago

Simplify 6(3x – 5) + 5(2x - 1). Write your answer in factored form

Alla [95]

Answer:

18x-30+10x-5=28x-30

Step-by-step explanation:

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3 years ago

Suppose you buy a CD for $300 that earns 3% APR and is compounded quarterly. The CD matures in 5 years. Assume that if funds are

klio [65]

Value of the CD after 3 months is given by 300(1 + 0.03 / 4) = 300(1 + 0.0075) = 300 x 1.0075 = $302.25.
Therefore, interest for 3 months = $302.25 - $300 = $2.25

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4 years ago

A distance AB is observed repeatedly using the same equipment and procedures, and the results, in meters, are listed below: 67.4

skad [1K]

Answer:

a) $\bar X =\frac{67.401+67.400+67.402+67.396+67.406+67.401+67.396+67.401+67.405+67.404}{10}=67.401$

b) The sample deviation is calculated from the following formula:

$s=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And for this case after replace the values and with the sample mean already calculated we got:

$s=0.0036$

If we assume that the data represent a population then the standard deviation would be given by:

$\sigma=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n}}$

And then the deviation would be:

$\sigma =0.00319$

Step-by-step explanation:

For this case we have the following dataset:

67.401, 67.400, 67.402, 67.396, 67.406, 67.401, 67.396, 67.401, 67.405, and 67.404

Part a: Determine the most probable value.

For this case the most probably value would be the sample mean given by this formula:

$\bar X =\frac{\sum_{i=1}^n X_i}{n}$

And if we replace we got:

$\bar X =\frac{67.401+67.400+67.402+67.396+67.406+67.401+67.396+67.401+67.405+67.404}{10}=67.401$

Part b: Determine the standard deviation

The sample deviation is calculated from the following formula:

$s=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And for this case after replace the values and with the sample mean already calculated we got:

$s=0.0036$

If we assume that the data represent a population then the standard deviation would be given by:

$\sigma=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n}}$

And then the deviation would be:

$\sigma =0.00319$

3 0

4 years ago

How do I do this??????? 2/3x-(1/2x+1)<br>btw need it simplified

Setler79 [48]

Answer:

1/6x -1

Step-by-step explanation:

"Simplify" generally means, "eliminate parentheses and combine like terms." In general, parentheses are eliminated by making use of the distributive property.

$\dfrac{2}{3}x-\left(\dfrac{1}{2}x+1\right)=\dfrac{2}{3}x-\dfrac{1}{2}x-1=\left(\dfrac{2}{3}-\dfrac{1}{2}\right)x-1\\\\=\left(\dfrac{4}{6}-\dfrac{3}{6}\right)x-1=\boxed{\dfrac{1}{6}x-1}$

5 0

2 years ago