A biologist is researching a newly-discovered species of bacteria. He puts 200 bacteria into what he has determined to be a favorable growth medium. Nine hours later, he measures 380 bacteria. Assuming exponential growth, find the growth equation and use it to determine the number of bacteria after eight hours.

Note: Once you find the equation, round a and b to the nearest hundredth to determine the solution.

358

351

344

360

Answer:

9

Step-by-step explanation:

Just remove the DECIMALS

Therefore you get 63/7 which is obviously 9.

Answer:

9

Step-by-step explanation:

Long division (in diagram)

Answer:

P(face | Black) = 3/13

Step-by-step explanation:

total number of cards in standard deck of cards = 52

Total number of face cards = 12

Then P(face cards) = 12/52

Total number of black cards = 26

Then P(black cards) = 26/52

Total number of cards that are both black and face cards = 6

Then P(black and face cards) = 6/52

Then conditional probability of getting face card given that the card is black is given by:

P(face | Black) = P( face & Black) / P(Black)

P(face | Black) = (6/52) / (26/52)

P(face | Black) = 6/26

P(face | Black) = 3/13

Answer:

The probability of a face card given that the card is black = 3/26

Step-by-step explanation:

Points to remember

There are total 52 cards. It is divided into 4 suites, 13 each.

Spades, Clubs, Hearts and Diamonds

Spades and  Clubs are black.

Hearts and Diamonds are red

In each suites there are 3 face cards.

To find the probability

There are total 52 cards. And 6 black face cards

The  probability of a face card given that the card is black =6/52

 = 3/26

Answer:

The volume ratio of Prism A to Prism B is [tex]\frac{729}{8}[/tex]

Step-by-step explanation:

Step 1

Find the scale factor

we know that

If two figures are similar, then the ratio of its surface areas is equal to the scale factor squared

Let

z-----> scale factor

x/y----> ratio of the surface area of Prism A to Prism B

so

[tex]z^{2}=\frac{x}{y}[/tex]

we have

[tex]\frac{x}{y}=\frac{81}{4}[/tex]

substitute

[tex]z^{2}=\frac{81}{4}[/tex]

[tex]z=\frac{9}{2}[/tex]

step 3

Find the volume ratio of Prism A to Prism B.

we know that

If two figures are similar, then the ratio of its volumes is equal to the scale factor elevated to the cube

Let

z-----> scale factor

x/y----> volume ratio of Prism A to Prism B

so

[tex]z^{3}=\frac{x}{y}[/tex]

we have

[tex]z=\frac{9}{2}[/tex]

substitute

[tex](\frac{9}{2})^{3}=\frac{x}{y}[/tex]

[tex](\frac{729}{8})=\frac{x}{y}[/tex]

The volume ratio of two similar prisms with a surface area ratio of 81:4 is obtained by cubing the square root of the surface area ratio, resulting in a volume ratio of 729:8.

The question involves finding the volume ratio of two similar prisms when the surface area ratio is given.

Since the surface areas are in a ratio of 81:4, the corresponding linear dimensions will be in the square root ratio, which is 9:2. For two similar three-dimensional shapes, if the ratio of their corresponding lengths is a:b, then the ratio of their surface areas is a^2:b^2, and the ratio of their volumes is a^3:b^3.

Therefore, the volume ratio of Prism A to Prism B can be found by cubing the linear dimension ratio: (9:2)^3 which equals 729:8. Hence, the volume ratio of Prism A to Prism B is 729:8.

Answer:

Negatively skewed

Step-by-step explanation:

Arrange this data in ascending order:

46, 50, 57, 58, 59, 59, 65, 66, 77, 80

and draw the bar chart as shown in attached diagram.

The data distribution appears to be negatively skewed (or left skewed), because the scores fall toward the higher side of the scale and there are very few low scores. The mean is also to the left of the peak.

Answer:

Negatively skewed

Step-by-step explanation:

Arrange this data in ascending order:

46, 50, 57, 58, 59, 59, 65, 66, 77, 80

and draw the bar chart as shown in attached diagram.

The data distribution appears to be negatively skewed (or left skewed), because the scores fall toward the higher side of the scale and there are very few low scores. The mean is also to the left of the peak.

7776pi since the volume of a sphere can be found by V=4/3pi(r)^3

V=4/3pi(18)^3

V=7776pi

Answer:

[tex]\large\boxed{972\pi\ cm^3}[/tex]

Step-by-step explanation:

[tex]\text{The formula of a volume of a sphere:}\\\\V=\dfrac{4}{3}\pi R^3\\\\R-radius\\\\\text{We have the diameter of the sphere.}\ D=18cm.\\\\D=2R\to R=\dfrac{18}{2}\ cm=9cm.\\\\\text{Substitute:}\\\\V=\dfrac{4}{3}\pi(9^3)=\dfrac{4}{3}\pi(729)=(4)\pi(243)=972\pi\ cm^3[/tex]

The value of x in the equation sin 40 = x/12 is found by multiplying both sides by 12 and then by the sine of 40 degrees, resulting in x being approximately 7.7136.

To find the value of x in the equation sin 40 = x/12, we need to isolate x on one side of the equation. To do this, we multiply both sides of the equation by 12 to get x on its own. So, the steps are as follows:

Multiply both sides of the equation by 12 to eliminate the denominator on the right side, which gives us 12 * sin 40 = x.

Calculate sin 40 using a calculator.

Finally, multiply the value of sin 40 by 12 to find the value of x.

Carrying out these steps:

sin 40 approximately equals 0.6428 (rounded to four decimal places).

Then we calculate 12 * 0.6428 = 7.7136 (rounded to four decimal places).

Therefore, the value of x is approximately 7.7136.

Answer:

t = 0.93 years

Step-by-step explanation:

Simple interest: I = prt

Given:

Interest(I)= $900, Investment(p) = $21,000, Rate(r) = 4.6% = 0.046

900 = 21000 × 0.046 × t

900 = 966 × t

[tex]\frac{900}{966}[/tex] = t

t = 0.93 years

Answer:

1: It's I think 2+2

2: If I got your accent right then it's 4

3: count 2 and 2 makes 4

4: YAYYY YOU GOT IT PRACTICE MORE

Step-by-step explanation:

PLZZZZ MARK BRAINLIST!! REALLY FUNNY QUESTION AND MADE MY DAY!!!

Answer:

1218.75

Step-by-step explanation:

7.5 x 5 = 37.5

37.5 x 3250 = 121875

121875 ÷ 100 = 1218.75

B. 900 inches squared

Work is shown in IMG

Answer: 4/13 or 0.308

Step-by-step explanation: Let event A be selecting a face card and event B be selecting a 3. A has 12 outcomes and B  has 4 outcomes. Because A & B are disjoint events the probability is:

P( A or B)= P(A) + P(B)= 12/52 + 4/52 = 16/52 simplified to 4/13

Answer:

[tex]\large\boxed{z=\dfrac{15\sqrt3}{2}}[/tex]

Step-by-step explanation:

We have the right triangle 30° - 60° - 90°. The sides are in ratio

1 : √3 : 2. Look at the picture.

[tex]15=2x\to2x=15[/tex]         divide both sides by 2

[tex]\dfrac{2x}{2}=\dfrac{15}{2}\\\\x=\dfrac{15}{2}[/tex]

[tex]z=x\sqrt3\to z=\dfrac{15}{2}\sqrt3=\dfrac{15\sqrt3}{2}[/tex]

Answer:

Step-by-step explanation:

Problem One

All quadrilaterals have angles that add up to 360 degrees.

Tangents touch the circle in such a way that the radius and the tangent form a  right angle at the point of contact.

Solution

x + 115 + 90 + 90 = 360

x + 295 = 360

x + 295 - 295 = 360 - 295

x = 65

Problem Two

From the previous problem, you know that where the 6 and 8 meet is a right angle.

Therefore you can use a^2 + b^2 = c^2

a = 6

b =8

c = ?

6^2 + 8^2 = c^2

c^2 = 36 + 64

c^2 = 100

sqrt(c^2) = sqrt(100)

c = 10

x = 10

Problem 3

No guarantees on this one. I'm not sure how the diagram is set up. I take the 4 to be the length from the bottom of the line marked 10 to the intersect point of the tangent with the circle.

That means that the measurement left is 10 - 4 = 6

x and 6 are both tangents from the upper point of the line marked 10.

Therefore x = 6

Answer:

x² + 2x + (3 / (x − 1))

Step-by-step explanation:

Start by setting up the division:

.........____________

x − 1 | x³ + x² − 2x + 3

Start with the first term, x³.  Divided by x, that's x².  So:

.........____x²______

x − 1 | x³ + x² − 2x + 3

Multiply x − 1 by x², subtract the result, and drop down the next term:

.........____x²______

x − 1 | x³ + x² − 2x + 3

.........-(x³ − x²)

...........----------

...................2x² − 2x

Repeat the process over again.  First term is 2x².  Divided by x is 2x.  So:

.........____x² + 2x __

x − 1 | x³ + x² − 2x + 3

.........-(x³ − x²)

...........----------

...................2x² − 2x

Multiply, subtract the result, and drop down the next term:

.........____x² + 2x __

x − 1 | x³ + x² − 2x + 3

.........-(x³ − x²)

...........----------

...................2x² − 2x

.................-(2x² − 2x)

.................---------------

.....................................3

x doesn't divide into 3, so that's the remainder.

Therefore, the answer is:

x² + 2x + (3 / (x − 1))

Answer:

[tex]R^{2}=0.7744[/tex]

Step-by-step explanation:

r represents the correlation coefficient between two sets of data. It is a measure of the degree of association between the two sets of data and gives insight into the strength and direction of the relationship.

On the other hand, [tex]R^{2}[/tex] is the coefficient of determination for a given data set. It is a measure of the predictive power of a linear model.

Given r, [tex]R^{2}[/tex] is simply the square of r;

in this case we are given, r = 0.88. Therefore, [tex]R^{2}=0.88^{2}\\\\R^{2}=0.7744[/tex]

Answer:

A= 10.5

Step-by-step explanation:

Answer:10.5 yards

Step-by-step explanation:3 x 7 / 2

Answer:

Step-by-step explanation:

A(1,4), B(4, -2), C(-1, 2)

In the first transformation, we multiply each x coordinate by -2, and each y coordinate by 1/2.

A(1*-2, 4/2) = A(-2, 2)

B(4*-2, -2/2) = B(-8, -1)

C(-1*-2, 2/2) = C(2, 1)

In the second transformation, we take each new x coordinate and subtract 2, and each new y coordinate and add 3:

A(-2-2, 2+3) = A(-4, 5)

B(-8-2, -1+3) = B(-10, 2)

C(2-2, 1+3) = C(0, 4)

Answer:

37

Step-by-step explanation:

To start out, if you know that the digits add to 10, then the number must me around 46-37, as 28 and 82 wouldn't make sense, and 55 is a palindrome.

37-->73, 73-37=36.

Step-by-step explanation:

10y + x = 10x + y + 36

x+y = 10

so we have to find y and x

10y - y = 10x - x + 36

9y = 9x + 36

Applying the definition of negative exponents, we have

[tex]3^{-2}\cdot 27 = \dfrac{1}{3^2}\cdot 27 = \dfrac{27}{9} = 3[/tex]

18/40 = 9/20 =

Simplified

Answer:

9/20 is the simplified 18/40

10 mm = 1 cm.

Divide total mm by 10 to get total cm's.

500/10 = 50 centimeters.

500/10 = 50

The answer here is 50 cm

You must use Pythagorean theorem:

a^2 + b^2 = c^2

You are given the two legs (40 and 9) which you will plug into a and b. That means that you have to find c, the hypotheses

40^2 + 9^2 = c^2

1600 + 81 = c^2

1681 = c^2

To get rid of the squared on the c, square root both sides:

41 = c

Hope this helped!

Answer: The missing length is 41m

Step-by-step explanation:

To find the missing length c, we simply use the Pythagoras thereon.

The Pythagoras theorem states that: in a right-angle triangle,

opposite²   +  adjacent² =  hypotenuse²

In this case

opposite = 40

adjacent = 9

hypotenuse = c (It is the missing length)

Applying the Pythagoras theorem to this;

opposite²   +  adjacent² =  hypotenuse²

          40²    +     9²       =      c²

We will now go ahead and simplify

40²    +     9²       =      c²

        1600    +    81      =  c²

        1681      =  c²

To get the value of c, we will simply take the square root of both-side

√ 1681      = √ c²

      41    =   c

Therefore the missing length is 41 m

To calculate the area Tia needs to waterproof, find the perimeter of the triangular base and multiply it by the height of the prism.

To find the area Tia will waterproof, we need to calculate the lateral surface area of the triangular prism. The lateral surface area is given by the formula:

Lateral Surface Area = Perimeter of Base × Height

First, find the perimeter of the triangular base by adding up the lengths of all three sides. Then, multiply this perimeter by the height of the prism. This will give you the area Tia needs to waterproof.

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To determine the area Tia needs to waterproof for her triangular prism tent with base dimensions 14 ft, 8 ft, and side lengths 8 ft, the total area is calculated as the sum of the areas of the two triangular bases.

To find the area that Tia needs to waterproof, we can calculate the surface area of the triangular prism. The formula for the surface area of a triangular prism is given by:

A = 2B + Ph

where:

- B is the area of the triangular base,

- P is the perimeter of the base, and

- h is the height of the prism.

First, calculate the area of one triangular base (either base 1 or base 2). The area B of a triangle is given by:

[tex]\[ B = \frac{1}{2} \times \text{base} \times \text{height} \][/tex]

For base 1:

[tex]\[ B_1 = \frac{1}{2} \times 14 \times 8 = 56 \, \text{ft}^2 \][/tex]

Now, find the perimeter P of the base, which is the sum of the three sides:

[tex]\[ P = \text{side}_1 + \text{side}_2 + \text{side}_3 \][/tex]

[tex]\[ P_1 = 8 + 8 + 14 = 30 \, \text{ft} \][/tex]

Now, substitute these values into the formula for the surface area:

[tex]\[ A_1 = 2 \times 56 + 30 \times h \][/tex]

Similarly, calculate the area [tex]\( A_2 \)[/tex] for base 2.

Tia needs to waterproof both bases, so the total area to be waterproofed is [tex]\( A_1 + A_2 \).[/tex]

Answer:

p=m/v

v=9 x 4 x 4=144cm

m=1267.2g

p=1267.2/144

p=8.8 g/cm^3

Answer:

8.8

Step-by-step explanation:

Density = Mass / Volume

Volume = 9 × 4 × 4  = 144

Mass = 1267.2

Density = 1267.2 / 144 = 8.8

5/8 paper chains used more than 2 containers but less than 2 3/4 containers of glitter.

Answer:

Because some applicants volunteer and meet the GPA requirements the events are NOT MUTUALLY exclusive. Thus, the probability is 65%

The probability that an applicant meets the GPA requirements or volunteers is 65%.

To find the probability that an applicant meets the GPA requirements or volunteers, we need to determine the number of applicants who meet either requirement. From the given information, there are 950 applicants who meet the GPA requirements and 600 applicants who volunteer for community service. However, there are 250 applicants who meet both requirements, so we count them only once.

To find the total number of applicants who meet either requirement, we add the number of applicants who meet the GPA requirements and the number of applicants who volunteer and subtract the number of applicants who meet both requirements:

Total number of applicants who meet either requirement = 950 + 600 - 250 = 1300

The probability that an applicant meets the GPA requirements or volunteers is the number of applicants who meet either requirement divided by the total number of applicants:

Probability = Number of applicants who meet either requirement / Total number of applicants = 1300 / 2000 = 0.65 = 65%

Learn more about Probability here:

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The sum of the first four terms of the arithmetic series 4+8+12+... is calculated using the sum formula for arithmetic series, resulting in a sum of 40.

The question seeks the expression for the sum of the first four terms of the arithmetic series 4+8+12+... To solve this, we utilize the formula for the sum of the first n terms of an arithmetic series, which is Sn = n/2 [2a + (n-1)d], where Sn is the sum of the first n terms, a is the first term, d is the common difference, and n is the number of terms.

For the series 4+8+12+..., the first term a = 4, the common difference d = 4, and the number of terms n = 4. Plugging these values into the formula gives us:

S4 = 4/2 [2(4) + (4-1)4] = 2 [8 + 12] = 2 × 20 = 40.

Therefore, the sum of the first four terms of the arithmetic series 4+8+12+... is 40.

This expression sums from [tex]\( (k-1)^4 \) to \( 4n \),[/tex] which doesn't represent the arithmetic series either.

None of the given expressions seem to represent the arithmetic series [tex]\(4 + 8 + 12 + ... \)[/tex] for four terms correctly.

An arithmetic series is a sequence of numbers in which the difference between any two consecutive terms is constant. In this case, the series given is:

[tex]\[ 4 + 8 + 12 + ... \][/tex]

The common difference between consecutive terms is (8 - 4 = 4).

The general formula for the sum of an arithmetic series is:

[tex]\[ S_n = \frac{n}{2}(a_1 + a_n) \][/tex]

Where:

[tex]- \( S_n \)[/tex] is the sum of the first ( n ) terms,

[tex]- \( a_1 \)[/tex]is the first term,

[tex]- \( a_n \) is the \( n \)[/tex]-th term.

To find the sum of the first four terms, we can use this formula.

Now, let's look at each option:

[tex]a. \( \sum\limits_{(a-1)^4}^{(2n+4)} \)[/tex]

[tex]b. \( \sum\limits_{(s=1)}^{4} (1+4n) \)[/tex]

[tex]c. \( \sum\limits_{(k=1)}^{4} (n+4) \)[/tex]

[tex]d. \( \sum\limits_{(k-1)^4}^{4n} \)[/tex]

We need to choose the expression that correctly represents the sum of the arithmetic series.

Using the formula for the sum of an arithmetic series, we have:

[tex]\[ a_1 = 4 \][/tex]

[tex]\[ a_n = 4 + (4 \times (n-1)) \][/tex](since the common difference is 4)

Now, let's plug these values into the formula:

[tex]\[ S_4 = \frac{4}{2}(4 + (4 + 4 \times (4-1))) \][/tex]

[tex]\[ S_4 = \frac{4}{2}(4 + 4 + 16) \][/tex]

[tex]\[ S_4 = \frac{4}{2}(24) \][/tex]

[tex]\[ S_4 = 2 \times 24 \][/tex]

[tex]\[ S_4 = 48 \][/tex]

So, the sum of the first four terms of the series is 48.

Now, let's see which expression correctly represents this sum.

a. [tex]\( \sum\limits_{(a-1)^4}^{(2n+4)} \)[/tex]

  - This expression doesn't seem to represent an arithmetic series.

b. [tex]\( \sum\limits_{(s=1)}^{4} (1+4n) \)[/tex]

  - This expression doesn't seem to represent an arithmetic series either.

c.[tex]\( \sum\limits_{(k=1)}^{4} (n+4) \)[/tex]

  - This expression sums[tex]\( n+4 \) for \( k = 1 \) to \( k = 4 \)[/tex], but it doesn't seem to correctly represent the arithmetic series.

d. [tex]\( \sum\limits_{(k-1)^4}^{4n} \)[/tex]

  - This expression sums from [tex]\( (k-1)^4 \) to \( 4n \),[/tex] which doesn't represent the arithmetic series either.

None of the given expressions seem to represent the arithmetic series [tex]\(4 + 8 + 12 + ... \)[/tex] for four terms correctly. If none of the options are correct, it's possible that there might be a typo or a mistake in the options provided.

2. Which expression defines the arithmetic series 4+8+12+.. for four terms? a.sumlimits _(a-1)^4(2n+4)

b.sumlimits _(s=1)^4(1+4n)

c.sumlimits _(k=1)^4(n+4)

d.sumlimits _(k-1)^44n

The answer is:

According to the picture, the angle that the boat should head upstream is 19° north of west.

From the figure, we can see that there is a right triangle formed, and since we know its hypothenuse and its opposite side, we can use the following trigonometric relation:

[tex]Sin(\alpha)=\frac{opposite}{hypothenuse}[/tex]

We are given that:

[tex]opposite=6\\hypothenuse=18[/tex]

So, substituting and calculating, we have:

[tex]Sin(\alpha)=\frac{6}{18}[/tex]

[tex]Arcosin(Sin(\alpha))=Arcsin(\frac{6}{18})\\\\\alpha =19.47\°[/tex]

Therefore the angle that the boat should head upstream is 19°, but since speeds and direction and involved, we need to look for the direction, we can see that the vertical speed is due to north, and the horizontal speed is due to west, knowing that, we can conclude that the resultant speed will be due to north of west.

Hence,  according to the picture, the angle that the boat should head upstream is 19° north of west.

Have a nice day!

ANSWER

Quadrant IV

EXPLANATION

The given point have the x-coordinate to be positive and the y-coordinate to be negative.

In general, the point P(x,-y) lies in the fourth quadrant.

The reason is that, this quadrant contains the positive x-axis and the negative y-axis.

See attachment for diagram.

Answer: II and IV

Step-by-step explanation:

5 gallons, 24 quarts (6 gallons), 10.6 gallons

To arrange 5 gallons, 10.6 gallons, and 24 quarts from smallest to largest, first convert all measurements into the same unit (quarts). The arrangement from smallest to largest is 5 gallons, 24 quarts, and 10.6 gallons.

To arrange the given measurements of 10.6 gallons, 5 gallons, and 24 quarts from smallest to largest, we first need to convert them into the same unit for an accurate comparison. Given the conversion factor of 1 gallon equals 4 quarts, we can start the comparison process.

In quarts, the order from smallest to largest is as follows: 20 quarts (5 gallons), 24 quarts, and 42.4 quarts (10.6 gallons). Therefore, when we arrange the original units from smallest to largest, it will be 5 gallons, 24 quarts, and then 10.6 gallons.