Answer:

**Answer with Step-by-step explanation:**

Since 1 mole of sand will contain Avagadro's Number of sand particles (by definition of 1 mole)

Thus we have

1 mole of sand = sand particles

Thus in number of trillion sand particles we have no of trillion sand particles in 12 mole is

Now since it is given that mass of 1 trillion sand particles is 1000 tonnes Thus the mass of trillion sand particles is

**Part 2)**

Since it is given that volume of 1 sand particle is thus the volume of 1 mole of sand is volume of sand particles

Thus volume of 1 mole is

Now since the Area of united states is

Thus the depth of the sand pile is

PLEASE HELP Function f is an exponential function. It predicts the value of a famous painting, in thousands of dollars, as a function of the number of years since it was last purchased.What equation models this function?(My graph is below)Enter your answer in the box.f(x)=

Nielsen Media Research wants to estimate the mean amount of time, in minutes, that full-time college students spend texting each weekday.Find the sample size necessary to estimate that mean with a 15 minute margin of error. Assume that a 96% confidence level is desired and that the standard deviation is estimated to be 112.2 minutes.

A three-digit number has two properties. The tens-digit and the ones-digit add up to 5. If the number is written with the digits in the reverse order, and then subtracted from the original number, the result is 792. Use a system of equations to nd all of the three-digit numbers with these properties

How is dividing and multiplying with an area model similar and How is it different?

A disease has hit a city. The percentage of the population infected t days after the disease arrives is approximated by p(t)equals7 t e Superscript negative t divided by 13 for 0less than or equalstless than or equals39. After how many days is the percentage of infected people a maximum? What is the maximum percent of the population infected?

Nielsen Media Research wants to estimate the mean amount of time, in minutes, that full-time college students spend texting each weekday.Find the sample size necessary to estimate that mean with a 15 minute margin of error. Assume that a 96% confidence level is desired and that the standard deviation is estimated to be 112.2 minutes.

A three-digit number has two properties. The tens-digit and the ones-digit add up to 5. If the number is written with the digits in the reverse order, and then subtracted from the original number, the result is 792. Use a system of equations to nd all of the three-digit numbers with these properties

How is dividing and multiplying with an area model similar and How is it different?

A disease has hit a city. The percentage of the population infected t days after the disease arrives is approximated by p(t)equals7 t e Superscript negative t divided by 13 for 0less than or equalstless than or equals39. After how many days is the percentage of infected people a maximum? What is the maximum percent of the population infected?

−5x−9y

5x−9y

=3

=−2

**Answer:**

-18y=1

**Step-by-step explanation:**

Did it on Khan Academy

Put the numbers in order

28, 36, 36, 50, 73, 80

|. |. |

The upper quartile is 73

28, 36, 36, 50, 73, 80

|. |. |

The upper quartile is 73

the upper quartile is 80

k(x) = -5x² - 125

The zeros of k are x= □ and x= □

**Answer:**

x = ±5i

**General Formulas and Concepts:**

__Pre-Alg__

- Order of Operations:
**BPEMDAS**

__Alg II__

- √-1 is imaginary number i

**Step-by-step explanation:**

__Step 1: Define function__

k(x) = -5x² - 125

__Step 2: Find roots__

- Set function equal to 0: 0 = -5x² - 125
- Factor out -5: 0 = -5(x² + 25)
- Divide both sides by -5: 0 = x² + 25
- Subtract 25 on both sides: -25 = x²
- Rewrite: x² = -25
- Square root both sides: x = ±√-25
- Rewrite: x = √-1 · ±√25
- Evaluate: x = ±5i

219 * $4 =

875 is the answer to your question so have a nice day

**Answer:**

- 12.16 miles

**Step-by-step explanation:**

Speed - s, Distance - d, Time - t

__Equation of time is:__

- t = d/s

__Given, __

- s1 = 32 m/h, s2 = 38 m/h, t1 + t2 = 42 min = 42/60 h = 7/10 h

__Total time is the sum of time values to and from the town:__

- d/32 + d/38 = 7/10
- d/16 + d/19 = 7/5
- d(1/16 + 1/19) = 7/5
- d(16 + 19) = 7(16*19)/5
- 35d = 425.6
- d = 425.6/35
- d = 12.16

It is given that,

→ s1= 32 miles/h

→ s2 = 38 miles/h

Now t1 + t2 is,

→ 42 min

→ 42/60 hours

→ 7/10 hours

The formula we use,

→ Time = Distance/Speed

→ t = d/s

Then the total time is the,

Sum of time values to and from the town.

→ d/32 + d/38 = 7/10

→ d/16 + d/19 = 7/5

→ d{(1/16) + (1/19)} = 7/5

→ d(16 + 19) = (7/5) × (16 × 19)

→ 35d = 425.6

→ d = 425.6/35

→ d = 12.16

Hence, the distance is 12.16 miles.

a:

b:

C:

**Step-by-step explanation:**

2x (5x - 1) + (3x^2 - 7x - 2)

= 10x^2 - 2x + 3x^2 - 7x - 2

= 13x^2 - 9x - 2

a = 13

b = -9

c = 2