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4 years ago

What does (2x + y)2 equal out to

Mathematics

2 answers:

Nat2105 [25]4 years ago

7 0

Answer:

4 x^2 + 4 x y + y^2

Step-by-step explanation:

Expand the following:

(2 x + y)^2

(2 x + y) (2 x + y) = (2 x) (2 x) + (2 x) (y) + (y) (2 x) + (y) (y):

2×2 x x + 2 x y + 2 y x + y y

2 x×2 x = 2×2 x^2:

2×2 x^2 + 2 x y + 2 y x + y y

2×2 = 4:

4 x^2 + 2 x y + 2 y x + y y

y y = y^2:

4 x^2 + 2 x y + 2 y x + y^2

x y 2 + y x 2 = 4 x y:

Answer: 4 x^2 + 4 x y + y^2

maksim [4K]4 years ago

3 0

Answer:

4x+2y

Step-by-step explanation:

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In a sample of 115 115 curtains, the average length was found to be 32.2in. 32.2 ⁢ in. With a standard deviation of 0.8 0.8 . Gi

pentagon [3]

Answer:

The point estimate for the population standard deviation of the length of the curtains is 8.58in.

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem, we have that:

$s = 0.8, n = 115$

The point estimate for the population standard deviation of the length of the curtains is $\sigma$ . So

$s = \frac{\sigma}{\sqrt{n}}$

$\sigma = s\sqrt{n}$

$\sigma = 0.8\sqrt{115}$

$\sigma = 8.58$

The point estimate for the population standard deviation of the length of the curtains is 8.58in.

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3 years ago

Adriyana wants to determine the difference quotient

S_A_V [24]

Answer:

The answer is B

Step-by-step explanation:

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3 years ago

If 15 is 25% of a value, what is that value?

serg [7]

The value is 60, if 15 is 25% of the value

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3 years ago

Read 2 more answers

Two numbers are in a ratio of 5:4. Their sum is 720. Find the bigger number.

alexgriva [62]

So the numbers are x and y
x:y=5:4
x/y=5/4
this means that x is worth 5 units and y is worth 4 units so
x:y=5:4, therefore it can be represented by
x:y=5z:4z
we know that they add to 720
720=5z+4z
add like terms
720=9z
divide by 9
80=z
multiply by 4
320

80=z
mutipply by 5
400

the numbers are 400 and 320

8 0

4 years ago

Dominic runs a farm stand that sells peaches and grapes yesterday Dominic sold 34 pounds of peaches and 45 lb of grapes for a to

iren2701 [21]

Answer:34p+16g=208

47p+16g=208

Step-by-step explanation:

Let p=the price of each pound of peaches.

Let g=the price of each pound of grapes.

Each pound of peaches sells for $p, so 34 pounds of peaches will bring in 34p dollars. Each pound of grapes will bring in 45g dollars. Therefore, the total amount 34p+45g=192.25

Likewise, if 47 pounds of peaches and 16 pounds of grapes brought in $208 then

47p+16g=208

34p+45g=192.25

47+16g=208

3 0

3 years ago