Answer:

**Answer:**

**Step-by-step explanation:**

From the information given:

a human brain weighs = 1 kg ; = 1000 grams

Number of cells = 10¹¹ cells

The density of water filled in each cell = 1 g/mL

From above;

the weight of each of the brain cell = total weight of the human brain/the number of cells

the weight of each of the brain cell = 1000/10¹¹

the weight of each of the brain cell = 1 × 10⁻⁸ grams

Now, to calculate the quantity of water in each cell; we have:

= the weight of each brain × density

=

For cube; we know that

1 mL = 1 cm³

Thus:

Recall that; the volume of a cube as well =

where;

x = length of each sides

∴

=

x = 0.0022 cm

Thus, the length of each side of the cell = **0.0022 cm**

The surface area of a single cell = x²

The surface area of a single cell = (0.0022 cm)²

The surface area of a single cell = 4.84 × 10⁻⁶ cm²

Therefore, the total surface area of is:

=

=

**= 50 m²**

Answer:
### Final answer:

### Explanation:

### Learn more about Cell volume here:

If the **human brain's cells** were cube-shaped and filled with water, each cell would be roughly 21.5 micrometers on a side. If these cells were spread out into a single-cell-thick layer, the total surface area for one side of the layer would be approximately 4.63 square meters.

To answer your question, the human brain has about 1011 cells, each filled with water. Given the total mass of the brain (about 1 kg) and the number of cells, we can calculate the volume of a single cell. The density of water is 1 g/mL or 1,000 kg/m³, so the **volume of all the cells** (entire brain) is 1 m³. Therefore, the volume of a single cell must be 1 m³/1011 cells, which is approximately 10-14 m³. For a cubical cell, the side length of the cube (a) would be the **cube root** of this volume, which is approximately 2.15 x 10-5 m or **21.5 micrometers**.

To calculate the total surface area for one side of the cell layer, we multiply the area of a single cell by the total number of cells: (2.15 x 10-5)² m²/cell x 1011 cells = approximately **4.63 m²**.

#SPJ3

Need help asap Graph f(x) = 3x + 4 and h(x) = f(x) +1

Solve: x^2 – 16x + 63 < 0

Suppose you are a chemist who is trying to synthesize a specific compound. You have been working with a new technique and you think that this process can turn 60% of the input compounds into the desired synthesized compound, and want to attempt the process enough times to get an estimate that is within .04 of the true proportion that is converted. How many times should you execute the process to get the desired precision

An oilfield contains 6 wells that produce a total of 1,800 barrels of oil per day. For each additional well that is drilled, the average production per well decreases by 25 barrels per day. Required:How many additional wells should be drilled to obtain the maximum amount of oil per day?

What value does the 9 represent in the number 53.89?

Solve: x^2 – 16x + 63 < 0

Suppose you are a chemist who is trying to synthesize a specific compound. You have been working with a new technique and you think that this process can turn 60% of the input compounds into the desired synthesized compound, and want to attempt the process enough times to get an estimate that is within .04 of the true proportion that is converted. How many times should you execute the process to get the desired precision

An oilfield contains 6 wells that produce a total of 1,800 barrels of oil per day. For each additional well that is drilled, the average production per well decreases by 25 barrels per day. Required:How many additional wells should be drilled to obtain the maximum amount of oil per day?

What value does the 9 represent in the number 53.89?

I think it’s but I’m not sure E

**Answer:**

:)

**Step-by-step explanation:**

Here you go! Hope this helps

1a. Gabriella uses these services:

Checking (she has an account)

Debit card

1b. At A+ Bank, Gabriella's monthly charges will be

$1 (for checking) + $2.50 (for debit card) = $3.50

At NextGen Bank, Gabriella's monthly charges will be

0 (for checking) + $0.50*20 (for debit card) = $10.00

1c. A+ Bank is a better deal for Gabriella. The fixed fees there are lower than the variable fee at NextGen Bank because she uses her debit card so much.

Checking (she has an account)

Debit card

1b. At A+ Bank, Gabriella's monthly charges will be

$1 (for checking) + $2.50 (for debit card) = $3.50

At NextGen Bank, Gabriella's monthly charges will be

0 (for checking) + $0.50*20 (for debit card) = $10.00

1c. A+ Bank is a better deal for Gabriella. The fixed fees there are lower than the variable fee at NextGen Bank because she uses her debit card so much.

The formula of interest is

A = (1/2)r²·θ

You have A = 70 m², θ = 170° = 17π/18 rad. Then the radius is found from

70 m² = (1/2)r²(17π/18)

(36·70 m²)/(17π) = r²

r ≈ √47.18476 m

** r ≈ 6.9 m**

A = (1/2)r²·θ

You have A = 70 m², θ = 170° = 17π/18 rad. Then the radius is found from

70 m² = (1/2)r²(17π/18)

(36·70 m²)/(17π) = r²

r ≈ √47.18476 m

The **radius **of the** circle** is 6.9 m.

The **area** of the **sector **of a **circle** given by the formula:

A = /360 * (r²)

where r is the **radius **of the circle and is the **central angle** of the sector

We have:

= 170°

A = 70 m²

We need to solve for r:

A = /360 * (r²)

70 = 170/360 * * r²

r² = (70 * 360)/(170 * )

r² = 47.18

r = √47.18

r = 6.9 m

Learn more about **sector** on:

#SPJ2

**Answer:**

**Step-by-step explanation:**

Hello!

You have two surveys that measure the weight of six-year-old girls in the USA,

__1) 1999-2002__

μ= 49.3 pounds

(I'll take this mean as the population value since it can be considered "historical data" or point of comparison to make the test.)

__2)2003-2006__

sample n= 190

sample mean x[bar]= 46 pounds

population standard deviation σ= 17 pounds

Assuming that the study variable X" Weight of six-year-old girls between 2003 - 2006" (pound) has a normal distribution.

If you need to test that the children are heavier now (2003-2006) than in the past (1999-2002) the test hypothesis is:

H₀: μ ≤ 49.3

H₁: μ > 49.3

α: 0.10

The statistic is Z= __ (x[bar]-μ) __ ~N(0;1)

(δ/√n)

The critical region is one-tailed to the right.

So you'll reject the null hypothesis if the calculated statistic is equal or greater than 1.28.

Z=__ 46 - 49.3 __ = -2.67

17/√190

Since the calculated value -2.67 is less than 1.28 you do not reject the null hypothesis. In other words, the six-year-old girls from 2003-2006 are thinner than the girls from 1999-2002.

I hope it helps!

The **number **of **times **that both coins come up **heads **will be 26.25.

In **parameter **estimation, the expected value is an **application **of the weighted sum. Informally, the **expected value **is the simple average of a considerable number of **individually **determined outcomes of a randomly **picked variable**.

The **expected **value is given below.

E(x) = np

Where n is the **number **of samples and p is the **probability**.

If **two **coins are flipped. Then the **total **number of the **event **is given as,

Total = 2 x 2 = 4 {HH, HT, TH, TT}

Favorable event = 1 {HH}

The **probability **of getting both **same**, then we have

P = 1/4

Jenna flips two pennies 105 **times**. Then the **number **of **times **that both coins come up **heads **will be given as,

E(x) = p × n

E(x) = 1/4 × 105

E(x) = 26.25

The **number **of **times **that both coins come up **heads **will be 26.25.

More about the **expected value** link is given below.

#SPJ2

Hi there!

Since the chance of one coin landing on heads is 1/2, we should multiply.

1/2 × 1/2 = 1/4

105 × 1/4 = 26.25

So, the answer is 26.25 times.

Hope this helps!

Since the chance of one coin landing on heads is 1/2, we should multiply.

1/2 × 1/2 = 1/4

105 × 1/4 = 26.25

So, the answer is 26.25 times.

Hope this helps!