The United States is about the only country that still uses the units feet, miles, and gallons. However, you might see some car specifications that give fuel efficiency as 7.6 km per kilogram of fuel. Given that a mile is 1.609 km, a gallon is 3.785 liters, and a liter of gasoline has a mass of 0.729 kg, what is the car’s fuel efficiency in miles per gallon?

Answer:

A)128

B)717

Step-by-step explanation:

In Roman numerals each letter have a numerical value in Hindu-Arabic numerals.

These values are:

I = 1

V = 5

X = 10

L = 50

C =100

D = 500

M = 1000

a) CXXVIII = 100+10+10+5+1+1+1 = 128

b) XCDCCCXXVII = 500+100+100+10+10+7-100-10 = 717

In this question we subtracted the value of XC(-100-10) because it was preceding or appeared before a larger value and hence, we subtract these values from the value of DCCCXXVII(500+100+100+100+10+10+7).

This could be understood with the help of following example: If we calculate the value of CD it would be (500-100) = 400. Now, XCD = (400-10) = 390.

Answer:

Open system

Step-by-step explanation:

We are putting can of soft drink in the refrigerator so that it will cool down. As we can see the can of soft drink cool down when it releases its heat to the refrigerator. As it can exchange its temperature with it's surrounding so it will be an open system. If it would be a closed system then it won't be able to release its heat to the surrounding so it won't be able to cool down.

Answer:

0.25g + 0.05g + 500g = 500.30g

Step-by-step explanation:

The first step is converting everything to grams, by rules of three. Then we add.

In a rule of three problem, the first step is identifying the measures and how they are related, if their relationship is direct of inverse.

When the relationship between the measures is direct, as the value of one measure increases, the value of the other measure is going to increase too.

When the relationship between the measures is inverse, as the value of one measure increases, the value of the other measure will decrease.

Unit conversion problems, like this one, is an example of a direct relationship between measures.

First step: 0.5kg to g

Each kg has 1000g. So

1kg - 1000g

0.5kg - xg

x = 1000*0.5

x = 500g

0.5kg = 500g

Second step: 50mg to g

Each g has 1000mg. So:

1g - 1000mg

xg - 50mg

1000x = 50

[tex]x = \frac{50}{1000}[/tex]

x = 0.05g

50mg = 0.05g

Third step: 2.5dg to g

Each g has 10dg. So:

1g - 10dg

xg - 2.5dg

2.5x = 10

[tex]x = \frac{2.5}{10}[/tex]

x = 0.25g

2.5 dg = 0.25g

Final step: Add

0.25g + 0.05g + 500g = 500.30g

Adding 0.5 kg, 50 mg, and 2.5 dg gives a total of 500.30 grams once all the units are converted to grams.

First, let's convert everything to grams as it's the unit we're asked to report the result in.

To find the total, we just need to add these numbers together: 500 grams + 0.05 grams + 0.25 grams = 500.30 grams. So, when you add 0.5 kg, 50 mg, and 2.5 dg together and convert it to grams, your answer is 500.30 grams.

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Answer:

D. 65.7-65.6

(the exact difference is 10.1, which is "about" 10)

The difference that is about 10 is 70.9-58.7. The correct option is B. 70.9-58.7

To determine the difference that is about 10, we will evaluate the given expressions one after the other.

The result that is closest to 10 gives the difference that is about 10

Evaluating this, we get

33.2-28.4 = 4.8

Evaluating this, we get

70.9-58.7 = 12.2

Evaluating this, we get

42.5-16.8 = 25.7

Evaluating this, we get

65.7-65.6 = 0.1

From above, we can observe that from A to D, the answer that is closest to 10 is 12.2

Hence, the difference that is about 10 is 70.9-58.7. The correct option is B. 70.9-58.7

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Answer:

120 MW/hour

Step-by-step explanation:

The formula of the average rate of change between two points in a function is:

Average rate of change (ARC) = f(x2) -f(x1)/(x2-x1)

Let's think  the power demad as a function d(x) depending of the hour of the day, so the variable x= hour of the day.

Now we have:

d(5)= 1600

d(8)= 1960

If we apply the mentioned ARC formula = [d(8)-d(5)] MW/(8-5)hour= (1960-1600)MW/3hour= 360/3=120 MW/Hour

This is the set of all integers greater than -2, excluded. So, the elements of the set are

[tex]\{-1,0,1,2,3,4,5,\ldots\}[/tex]

Given:

Set defining the rule → {y | y is an integer and y > -2}

To find:

The set following the given property

Solution:

Set defined by {y | y is an integer and y > -2} where y is the set of integers greater than -2.

Option (1)

{3,4,5,6........}

All the integers are greater than -2, therefore, this set will the answer.

Option (2)

{2, 3, 4, 5, 6.....}

All integers are greater than -2, therefore, this set will be the answer.

Option (3)

{-2, -1, 0, 1, 2, 3....}

There is an element which is equal to -2.

Therefore, given set will not be the answer.

Option (4)

{0, 1, 2, 3.....}

All elements are greater than -2.

Therefore, given set will be the answer.

Options (1), (2), (4) will be the answer.

Learn more about the integers,

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Answer:

Hence the current weighted average of student = 87.60

Step-by-step explanation:

Grades obtained by student are

Q1= 100

Q2= 93

IW1= 82

IW2= 83

H1= 80

the weighted average = sum of all the grades/ number of subjects

[tex]= \frac{100+93+82+83+80}{5}[/tex]= 87.60

Hence the current weighted average of student = 87.60

Answer: 8 inches

Step-by-step explanation:

We know that the area of a rectangle is given by :-

[tex]A=l\times w[/tex], where l is length and w is width of the rectangle.

Given : The width of rectangle : w=4 inches

The area of rectangle : A =32 inches.

Then substitute these values in the above formula, we have

[tex]32=l\times4\\\\\Rightarrow\ l=\dfrac{32}{4}=8[/tex]

hence, the length of rectangle = 8 inches.

Answer:

a) yes

b) no

Step-by-step explanation:

[tex](\mathbb{Z}, *)[/tex] is a gruop if satisfies the following conditions:

1. If a and b are two elements in [tex]\mathbb{Z}[/tex], then the product a*b is also in [tex]\mathbb{Z}[/tex].

2. The defined multiplication is associative, i.e., for all a,b,c in [tex]\mathbb{Z}[/tex], (a*b)*c=a*(b*c).

3. There is an identity element e such that e*a=a*e=a for every element a in [tex]\mathbb{Z}[/tex].

4. There must be an inverse of each element. Therefore, for each element a of [tex]\mathbb{Z}[/tex], the set contains an element b=a^(-1) such that a*a^(-1)=a^(-1)*a=e.

Let's see if the conditions are satisfied:

a)

1. if x and y are integers then x+y-1=a*y is an integer

2. If x,y and z are integers then

   (x*y)*z= (x+y-1)*z= (x+y-1) + z - 1= x +y+z-2,

   x*(y*z)= x*(y+z-1)= x + (y+z-1) -1 = x+ y + z -2

  Then (x*y)*z=x*(y*z), i.e, * is associative.

3. Let e=1 and b an integer. Observe that

    1*b=1+b-1=b and b*1= b + 1 -1= b.

  Then e is an identity element.

4. a and integer and b= 2- a. Observe that

    b*a= 2-a+a-1= 1 and a*b= a+2-a-1=1,

the b= a^(-1) is the inverse of a.

We conclude that [tex](\mathbb{Z}, *)[/tex] is a group.

b)

1. If x,y and z are integers then

   (x*y)*z= (x-y+xy)*z= (x-y+xy) - z + (x-y+xy)z= x -y-z+xy+xz-yz+xyz

   x*(y*z)= x*(y-z+yz)= x - (y-z+yz) +x(y-z+yz) = x-y +z + xy -xz -yz+xyz

  Then (x*y)*z≠x*(y*z), i.e, * isn't associative.

We conclude that [tex](\mathbb{Z}, *)[/tex] isn't a group.

Answer:

The interior angles for this triangle are 80º, 30º and 70º.

Step-by-step explanation:

The sum of a interior angle with it's respective exterior angle is also always 180º.

So, for the exterior angle that is 100º, we can find the first interior angle of the triangle

100º + A1 = 180º

A1 = 180º - 100º

A1 = 80º

The first interior angle of this triangle is A1 = 80º;

For the exterior angle that is 150º, we can find the second interior angle of the triangle.

150º + A2 = 180º

A2 = 180º - 150º

A2 = 30º

The second interior angle of this triangle is A2 = 30º.

From here, to find the third interior angle, we apply the following definition

The sum of the three interior angles of a triangle is always 180º.

So:

A1 + A2 + A3 = 180º

80º + 30º + A3 = 180º

110º + A3 = 180º

A3 = 180º - 110º

A3 = 70º

The third interior angle of this triangle is A3 = 70º.

The interior angles for this triangle are 80º, 30º and 70º.

Answer:

312

Step-by-step explanation:

Let the attendance before the drop be x

Now we are given that attendance dropped 4% this year

So new attendance = [tex]x-4\% \times x[/tex]

                               = [tex]x-\frac{4}{100} \times x[/tex]

                               = [tex]\frac{96x}{100}[/tex]

We are also given that attendance dropped 4% this year, to 300

So,  [tex]\frac{96x}{100}= 300[/tex]

[tex]x= 300 \times \frac{100}{96}[/tex]

[tex]x=312.5[/tex]

Hence the attendance before the drop was 312

Answer:

If it is a simple average, the average is 2.8 points.

If it is a weigthed-by-credits average, the average is 2.86 points.

Step-by-step explanation:

To calculate the simple average of this 5 grades, we sum all the points and divide it by 5:

In Algebra: A = 4 points

In History: B = 3 points

In Sociology: A = 4 points

In English: D = 1 point

In Seminar: C = 2 points

Average = (4+3+4+1+2)/5 = 2.8 points

If the average is weighted by the credits, we must add each score multiplied by the credits and, in total, divide it by the total amount of credits.

[tex]weighted-average = \sum(points_i*credits_i)/\sum(credits_i)\\\\weighted-average = (4*3+3*3+4*3+1*3+2*2)/(3+3+3+3+2)\\weighted-average = 40 / 14 = 2.86[/tex]

Final answer:

To find the student's semester GPA, assign points to each grade based on the grading scale, multiply by the credits for each course, sum these totals, and divide by total credit hours. The student's GPA is approximately 2.86.

Explanation:

To calculate the student's semester grade point average (GPA), we first multiply each grade by its respective credit hours, then sum these numbers, and finally divide by the total number of credit hours. Here is the breakdown:

Algebra: A (4 points) × 3 credits = 12

History: B (3 points) × 3 credits = 9

Sociology: A (4 points) × 3 credits = 12

English: D (1 point) × 3 credits = 3

Seminar: C (2 points) × 2 credits = 4

Next, we add these totals: 12 + 9 + 12 + 3 + 4 = 40. The sum of the credit hours is 3 + 3 + 3 + 3 + 2 = 14. The GPA is calculated as the total points divided by the total credit hours, which is:

GPA = Total Points / Total Credit Hours = 40 / 14 ≈ 2.86

Therefore, the student's semester GPA is approximately 2.86.

Answer:

[tex]r=5.23\%[/tex]

Step-by-step explanation:

we know that

The simple interest formula is equal to

[tex]I=P(rt)[/tex]

where

I is the Final Interest Value

P is the Principal amount of money to be invested

r is the rate of interest  

t is Number of Time Periods

in this problem we have

[tex]t=1\ years\\ P=\$27,580\\I=\$1,442.43\\r=?[/tex]

substitute in the formula above

[tex]1,442.43=27,580(r*1)[/tex]

Solve for r

[tex]r=1,442.43/27,580[/tex]

[tex]r=0.0523[/tex]

convert to percent

[tex]r=0.0523*100=5.23\%[/tex]

Total amount owed by Kyle = $21573

In the question,

Amount of money earned by Kyle in first three months = $94,000

Amount of money earned by Kyle in Remaining months working as a Full Time = $188, 000

Total Money earned by Kyle = $282,000

Now,

We know that the Percent of FICA(Federal Insurance Contributions Act) taxes are,

Social Security tax = 6.2 %

Medicare tax = 1.45 %

So,

Total percent of tax paid = 7.65 %

So,

Total amount paid in taxes = 7.65 % of Total Money earned by Kyle

Therefore,

Total amount paid in tax = 0.0765 x 282000 = $21573

Answer:

[tex]0.950796[/tex]

Step-by-step explanation:

Given that a shuttle launch depends on three key devices that may fail independently of each other with probabilities 0.01, 0.02, and 0.02, respectively.

Required probability =  the probability for the shuttle to be launched on time

= Probability that all three do not fail

Since each key device is independent of the other

we have

prob that all three do not fail = [tex](1-0.01)(1-0.02)(1-0.02)\\=0.99*0.98*0.98\\=0.950796[/tex]

Answer: 376.98192 mL

Step-by-step explanation:

We are going to use this equation.

V  = π  *  r²  * h

according to the question we have the value for r and h, if you replace the values into the equation we will get  following product:

note: also keep in mind that value of π is 3.141516

V  = π  *  r²  * h

V  = π  *  (4in)²  * (10in)

V = 502.64256 in³

after we can divide this value in 4 equals parts

then  we get the following equation:

502.64256 in³ / 4 = 125.66064 in³

after that that you can multiply this value by 3 to get the 3 parts of the cylinder vase for example:

125.66064 in³ * 3 = 376.98192 in³

and this result is the volume of water that we have to pour into the vase

Answer:

B.) 100 in2

Explanation:

20 x 10 = 200

200 ÷ 2 = 100

B.) 100 in2

Answer: It's b

Step-by-step explanation:

Answer:

Units for parameter k would be [tex]minutes^{-1}[/tex].

Step-by-step explanation:

The concentration of CA0 is given in M (moles per liter), which is the unit for CA; if we show units inside parenthesis in the equation, it would be:

[tex]CA (M)=CA0 (M) *(1-e-k(?)*t(minutes))[/tex]

For the concentration units of CA0 not to be affected by the units of the factor (1-e-k*t), this factor would have to be a number without units.

Since 1 is a constant without units, for the constant e to be able to subtract from 1 it would have to be a number without units, which also applies to the factor k*t.

For the factor k*t to be a number without units, k must have units that can be canceled when multiplied by t, which is given in minutes, so k must have units of [tex]\frac{1}{minutes} =minutes^{-1}[/tex]

This can be confirmed by operating the equation using only its units (units of parameter k are noted by a question mark):

[tex]M=M(0-0-?*minutes)[/tex]

[tex]\frac{M}{M} =?*minutes[/tex]

[tex]1=?*minutes[/tex]

[tex]\frac{1}{minutes}=?[/tex]

[tex]minutes^{-1}=?[/tex]

Answer:

The sum of two rational numbers is always a rational number.

Step-by-step explanation:

Rational Number is the number of the form [tex]\frac{p}{q}[/tex], q≠0 and p and q are integers.

Further, when we add or subtract two rational number it is always a rational number. Example:

[tex]\dfrac{4}{64} +\dfrac{25}{4} = \dfrac{4+25\times 16}{64} \\= \dfrac{4+400}{64} = \dfrac{404}{64} =\dfrac{101}{16}[/tex]

which is also a rational number.

Thus, the sum of two rational numbers is always a rational number.

Answer:

[tex]0\le P\le 1[/tex]

Step-by-step explanation:

The probability of an event is a number describing the chance that the event will happen.

Definition: The probability of an evant is

[tex]P=\dfrac{\text{Number of favorable outcomes}}{\text{Number of all possible outcomes}}[/tex]

1. An event that is certain to happen (Number of favorable outcomes = Number of all possible outcomes) has a probability of 1.

2. An event that cannot possibly happen (Number of favorable outcomes = 0) has a probability of 0.

3. If there is a chance that an event will happen, then its probability is between 0 and 1.

Thus,

[tex]0\le P\le 1[/tex]

The probability of an event occurring is always between 0 and 1, inclusive. Therefore, the correct inequality is 0≤P≤1.

The probability of an event (P) in a standard probability model is always defined between 0 and 1. Here, 0 represents the impossibility of the event, whereas 1 represents the certainty of the event. Therefore, the inequality that best describes the probability P is 0≤P≤1. Any other range for probability does not fit into the standard probability model used in mathematics.

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Answer:

Using the rule of 72, the doubling time is 9.35 years.

The exact answer is that the doubling time is 8.89 years.

Step-by-step explanation:

By the rule of 72, we have that the doubling time D is given by:

[tex]D = \frac{72}{Interest Rate}[/tex]

The interest rate is in %.

In our exercise, the interest rate is 7.7%. So, by the rule of 72:

[tex]D = \frac{72}{7.7} = 9.35[/tex].

Exact answer:

The exact answer is going to be found using the compound interest formula(since the rule of 72 is a simplification of this formula).

The compound interest formula is given by:

[tex]A = P(1 + \frac{r}{n})^{nt}[/tex]

Where A is the amount of money, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per unit t and t is the time the money is invested or borrowed for.

So, for this exercise, we have:

We want to find the doubling time, that is, the time in which the amount is double the initial amount, double the principal.

[tex]A = 2P[/tex]

[tex]r = 0.077[/tex]

There are 52 weeks in a year, so [tex]n = 52[/tex]

[tex]A = P(1 + \frac{r}{n})^{nt}[/tex]

[tex]2P = P(1 + \frac{0.077}{52})^{52t}[/tex]

[tex]2 = (1.0015)^{52t}[/tex]

Now, we apply the following log propriety:

[tex]\log_{a} a^{n} = n[/tex]

So:

[tex]\log_{1.0015}(1.0015)^{52t} = \log_{1.0015} 2[/tex]

[tex]52t = 462.44[/tex]

[tex]t = \frac{462.44}{52}[/tex]

[tex]t = 8.89[/tex]

The exact answer is that the doubling time is 8.89 years.

Answer:

l = 18 - L

Step-by-step explanation:

Since 18 feet board is cut into two pieces L and l.

L + l = 18

Subtracting both sides by L

l = 18 - L

Answer:

The person has to invest $5000 at 9% and $7000 at 10%.

Step-by-step explanation:

As stated in the problem, we have an ammount C that the person invest at 9% and an ammount (C+2000) that it is invested at 10%.

To gain $1150 a year, the ammount C needs to satisfy this equation:

[tex]C*0.09+(C+2000)*0.10=1150[/tex]

Applying distributive property,

[tex]0.09C+0.10C+200=1150\\0.19C=1150-200[/tex]

[tex]C=950/0.19\\C=5000[/tex]

So the person has to invest C=$5000 at 9% and (C+2000)=$7000 at 10% to gain $1150 of interest yearly.

Answer:

No, irrational numbers are not closed under multiplication.

Step-by-step explanation:

Irrational numbers are the numbers that cannot be demonstrated in the form of a fraction [tex]\frac{x}{y}[/tex]. We can define rational numbers in other ways as well. Irrational numbers are the numbers which when written in decimal form, the decimal expansion does not end. For example √2, √3, etc.

The closed property of multiplication of irrational numbers state that if two irrational numbers are multiplied, then their product is also an irrational number.

Let a and b be two irrational numbers, then a×b = c(c is product of a and b), c should also be an irrational number.

Irrational numbers are not closed under multiplication and this can be illustrated with the help of an example:

√2 × √2 = 2

It is clear that 2 is not an irrational number.

Hence, irrational numbers are not closed under multiplication.

Answer:  0.8531

Step-by-step explanation:

Let x be the random variable that represents the readings on scientific thermometers .

Given : The readings on scientific thermometers are normally distributed,

Population mean : [tex]\mu=0^{\circ}\ C[/tex]

Standard deviation : [tex]\sigma=1^{\circ}\ C[/tex]

Z-score : [tex]z=\dfrac{x-\mu}{\sigma}[/tex]

Now, the z-value corresponding to -1.05 :  [tex]z=\dfrac{-1.05.-0}{1}=-1.05[/tex]

P-value = [tex]P(x>-1.05)=P(z>-1.05)=1-P(z\leq-1.05)[/tex]

[tex]=1-0.1468591=0.8531409\approx0.8531\text{ (Rounded to four decimal places)}[/tex]

Hence, the probability of the reading greater than -1.05 in degrees Celsius.= 0.8531

Answer:

3.66

Step-by-step explanation:

Having a 2.9 GPA means there was a certain quantity of points divided by a quantity of credit hours.

In this case 37 hours because of the 20 given to obtain 2.25 and 17 additional hours to get 2.9

So to know the points to get 2.9, we multiply 2.9 by the hours (37)

gpa=[tex]\frac{points}{hours}[/tex]

gpa*hours= points

[tex]2.9*37= 107.3 points[/tex]

Now we need to find out how many points were given in 20 credit hours to get 2.25;

we do a similar calculation by multiplying 2.25 by the credit hours given to obtain that gpa.

gpa*hours=points

[tex]2.25*20=45[/tex]

Then from 45 points to get 107.3 we need to know the difference

[tex]107.3-45=62.3[/tex]

and because those points are needed in 17 additional credit hours, we make a division and we get

[tex]gpa=\frac{points}{hours}[/tex]

[tex]gpa=\frac{62.3}{17}=3.66[/tex]

So the student needs to make a 3.66 gpa minimum in order to improve her current 2.25 gpa to 2.9

The student needs to achieve a minimum GPA of 3.65 over the 17 additional credit hours to reach their goal of a 2.9 overall GPA, showing the importance of planning and effort.

To calculate the minimum GPA needed in the additional 17 hours for the student to achieve an overall GPA of 2.9 after already earning a 2.25 GPA over 20 credit hours, we will use a weighted average formula. Currently, the student has accumulated (2.25 * 20) = 45 quality points from the 20 credit hours. To reach a 2.9 GPA after adding 17 more credit hours, the student will need a total of (20 + 17) * 2.9 = 107.1 quality points.

Subtracting the quality points already earned from the total needed gives us 107.1 - 45 = 62.1 quality points needed over the 17 additional hours. Therefore, the minimum GPA required across these hours is 62.1 / 17 ≈ 3.65. This calculation indicates that, even though the target seems high, clearly understanding the effort needed can help in planning the study strategy accordingly.

Answer:

The expected number of women expected to give birth to identical twins is 5.

The calculation is:

[tex]x = \frac{3738*1,000}{804,665}[/tex]

Step-by-step explanation:

This is a proportionality problem, that can be solved by a rule of three. Here, the measures(the number of women that gave birth to identical twins and the nuber of women that gave birth) are directly related. It means that we have a direct rule of three(cross multiplication).

The problem states that of the 804,665 women that gave birth, 3,738 gave birth to identical twins. It asks of 1,000 women, how many are expected to give birth to identical twins? So, 3,738 of 804665 is how much of 1,000?

3,738 - 804,665

x   -  1,000

[tex]804,665x = 3738*1,000[/tex]

[tex]x = \frac{3738*1,000}{804,665}[/tex]

[tex]x = 4.64[/tex]

Rounding up, the expected number of women expected to give birth to identical twins is 5.

Answer:

Let the growth function that shows the population in millions after x years,

[tex]P=P_0(1+r)^x[/tex]

Where,

[tex]P_0[/tex] = initial population,

r = growth rate per year,

Suppose the population is estimated since 1950,

Thus, if x = 0, P = 2560,

[tex]\implies 2560 = P_0 (1+r)^0\implies P_0 = 2560[/tex]

Now, if x = 10 ( that is, on 1960 ), P = 3040,

[tex]3040=2560(1+r)^{10}\implies r = 0.017[/tex]

Hence, the required function that shows the population after x years,

[tex]P=2560(1.017)^x[/tex]

If x = 42,

The population in 1992  would be,

[tex]P=2560(1.017)^{42}\approx 5196.608365\text{ millions}[/tex]

if x = 80,

The population in 2030 would be,

[tex]P=2560(1.017)^{80}\approx 9860.891929\text{ millions}[/tex]

Final answer:

The world population growth can be modeled using exponential growth with a relative growth rate calculated from given data. The relative growth rate, k, was found to be approximately 0.017355. Using this rate, we can estimate past and predict future populations; however, demographic trends show that actual growth rates are slowing.

Explanation:

To model the world population using a proportional growth rate, we employ the exponential growth model where dP/dt = kP. The world population was 2560 million in 1950 (P(0) = 2560) and 3040 million in 1960 (P(10) = 3040). We will use these data points to find the relative growth rate k.

Finding the Relative Growth Rate

The general solution of the differential equation is P(t) = P(0)e^(kt), where e is the base of the natural logarithm. Inserting our initial conditions:

P(0) = 2560, which implies C = 2560 where C is the initial population.

P(10) = 3040 yields 3040 = 2560e^(10k).

Dividing both sides by 2560 gives 3040/2560 = e^(10k), and then taking the natural logarithm of both sides we find ln(3040/2560) = 10k. Therefore, k ≈ ln(1.1875)/10. By calculating, k ≈ 0.017355 (rounded to six decimal places).

Estimating World Population for 1992 and Predicting for 2030

Using this growth rate, we can estimate the world population for any year t with P(t) = 2560e^(0.017355t):

For the year 1992 (t=42 years since 1950), P(42) ≈ 2560e^(0.017355*42).

For the year 2030 (t=80 years since 1950), P(80) ≈ 2560e^(0.017355*80).

Demographic trends suggest a slowing growth rate. Between 1965 and 1980, the annual rate was 2%, while predictions for 2005-2015 showed a decline to 1.1%. These numbers imply increasing doubling times and changing dynamics in world population growth.

Answer:

Step-by-step explanation:

1. Number of boys in the group = 25

Number of girls in the group = 18

Total children = 25 + 18 = 43

Number of ways to arrange the children in a way = 43!

2. If we consider all the boys as an individual then number of ways children can be arranged = 19!

Number of ways boys can sit next to each other = 25!

So the number of ways can be arranged = 19!×25!

3. Number of ways boys can sit next to each other = 25!

Number of ways girls can sit next to each other = 19!

Then number of ways to arrange the children in a row with all boys next to each other and all the girls next to each other will be = 2 × 18! × 25!

4. 1. To choose a chess team if anyone can be chosen

= [tex]^{43}C_{6}[/tex]

= 6096454

4. 2. Exactly 2 girls must be chosen then number of ways

= [tex]^{18}C_{2}\times ^{25}C_{4}=1935450[/tex]

4. 3. At least two boys must be chosen

= [tex]^{25}C_{2}\times ^{18}C_{4}+^{25}C_{3}\times ^{18}C_{3}+^{25}C_{4}\times ^{18}C_{2}+^{25}C_{5}\times ^{18}C_{1}+^{25}C_{6}[/tex]

= 5863690

Answer:

1.5 ml

Step-by-step explanation:

We have been given that the concentration on hand is 10 mg per ml.

We know that gr stands for grains.

We know that 1 gr equals 60 mg.

First of all, we will convert 1/4 gr to mg as:

[tex]\frac{1}{4}\text{ gr}\times \frac{60\text{ mg}}{\text{ gr}}[/tex]

[tex]\frac{1}{4}\times 60\text{ mg}[/tex]

[tex]15\text{ mg}[/tex]

1 ml equals 10 mg. We can set an a proportion as:

[tex]\frac{x}{15\text{ mg}}=\frac{\text{1 ml}}{10\text{ mg}}[/tex]

[tex]\frac{x}{15\text{ mg}}*15\text{ mg}=\frac{\text{1 ml}}{10\text{ mg}}*15\text{ mg}[/tex]

[tex]x=\text{1 ml}*1.5[/tex]

[tex]x=\text{1.5 ml}[/tex]

Therefore, 1.5 ml is needed for the dose.