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3 years ago

Represent the following sentence as an algebraic expression, where "a number" is the

Mathematics

2 answers:

r-ruslan [8.4K]3 years ago

6 0

Answer:

2x where 2 is a number and x is a variable

Firlakuza [10]3 years ago

4 0

Answer:

2x where 2 is a number and x is a variable

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Which of the following values are in the range of the function graphed below?

Dafna1 [17]

Answer:

A. 1

Step-by-step explanation:

I see only one red function line in the graph. this line represents the simple function y = 1, for x in the interval [-2,1].

the domain of a function defines the possible values for x, and the range of a function defined the possible values for y.

this function has only one possible value for y : 1

so, only A applies.

5 0

3 years ago

A hospital recorded the weights, in ounces, of newborn babies for two weeks. The

Gwar [14]

Answer:

The standard deviation for week two was about 3 ounces more than the standard deviation for week one

Step-by-step explanation:

Given

$Week\ 1: 128, 105, 80, 82, 96, 98, 87, 100, 112, 126$

$Week\ 2: 75, 85, 90, 97, 89, 105, 110, 127, 129, 130$

See attachment for options

Required

The true statement

Checking the standard deviation

For week 1

Calculate the mean:

$\bar x = \frac{\sum x}{n}$

$\bar x = \frac{128+ 105+ 80+ 82+ 96+ 98+ 87+ 100+ 112+ 126}{10}$

$\bar x = \frac{1014}{10}$

$\bar x_1 = 101.4$

Then standard deviation

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}$

$\sigma_1 = \sqrt{\frac{(128 - 101.4)^2 +............+ (126- 101.4)^2}{10}}$

$\sigma_1 = \sqrt{\frac{2522.4}{10}}$

$\sigma_1 = \sqrt{252.24$

$\sigma_1 = 15.88$

For week 2, we have:

$\bar x = \frac{75+ 85+ 90+ 97+ 89+ 105+ 110+ 127+ 129+ 130}{10}$

$\bar x = \frac{1037}{10}$

$\bar x_2 = 103.7$

Then standard deviation

$\sigma_2 = \sqrt{\frac{(75 - 103.7)^2 +................+ (130- 103.7)^2}{10}}$

$\sigma_2 = \sqrt{\frac{3538.1}{10}}$

$\sigma_2 = \sqrt{353.81$

$\sigma_2 = 18.81$

Compare the standard deviations

$\sigma_1 = 15.88$

$\sigma_2 = 18.81$

Calculate the difference:

$d = \sigma_2 - \sigma_1$

$d = 18.81 - 15.88$

$d = 2.93$

$d \approx 3$

This implies that option (b) is true

4 0

3 years ago

Which should be the first step in solving equation 1.2w-3.8=12.4

lapo4ka [179]

Answer:

1.2w = 16.2

Step-by-step explanation:

Add both sides of the equation by 3.8

5 0

3 years ago

What is the area of this shape?

andreev551 [17]

Answer:

c because 5×4=20 and 3×5÷2=7.5= 27.5

5 0

3 years ago

Can you help me solve this thank you p

Tems11 [23]

Answer:

x = 30

Step-by-step explanation:

We can begin by subtracting 1/4x from each side so it results like this:

1/2x − 7 = 8

Then, we added 7 to both sides:

1/2x = 15

Lastly, we multiply both sides by 2:

x = 30

5 0

3 years ago