negative one-third divided by five-fourths divided by negative two-fifths equals?

Answer:

12 nickles and 9 dimes

Step-by-step explanation:

First, let's use the first equation, n + d = 21, to solve for d in terms of n:

n + d = 21     [Subtract n from both sides]

d = 21 - n

Now that we have found d in terms of n, let's plug d into the second equation, 0.05n + 0.1d = 1.5:

0.05n + 0.1d = 1.5     [Plug in d]

0.05n + 0.1(21 - n) = 1.5     [Distribute 0.1 to (21-n)]

0.05n + 2.1 - 0.1n = 1.5     [Combine like terms]

-0.05n + 2.1 = 1.5     [Subtract 2.1 from both sides]

-0.05n = -0.6     [Divide both sides by -0.05]

n = 12

Now that we have found the amount of nickles Donna had, let's use the first equation, n + d = 21, to solve for d, the amount of dimes she used.

n + d = 21     [Plug in n]

12 + d = 21     [Subtract 12 from both sides]

d = 9

So, Donna must have bought her candy bar using 12 nickles and 9 dimes.

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The solution is, The value of x where f(x) = g(x) is 3.

Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable.

here, we have,

Functions and values

According to the given question, we are to find the value of x for which the function f(x) is equal to g(x)

From the given table, we need to find the point where the values of f(x) = g(x). The value of x at this point is the solution.

Therefore from the table, the value of x where f(x) = g(x) is 3

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The expression 81xy^4 - yx cannot be simplified

From the question, we have the following parameters that can be used in our computation:

81xy4 - yx

Express properly

So, we have the following representation

81xy^4 - yx

This expression can be rewritten a

81xy^4 - xy

There are no like terms in the above expression

This means that the expression cannot be simplified

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a) The initial population is [tex]N_0[/tex] = 125 / [tex]e^{(2k)}[/tex].

b) The exponential growth model for the bacteria population is N = [tex]N_0[/tex] × [tex]e^{(kt)}[/tex].

c) The number of bacteria after 8 hours is N = [tex]N_0[/tex] × [tex]e^{(8k)}[/tex].

d) After t = ln(25,000 / [tex]N_0[/tex]) / k hours the bacteria count will be 25,000.

(a) To calculate the beginning population, we must first establish the bacterium population's exponential growth rate. Assume that the initial bacterial population is [tex]N_0[/tex]. The exponential growth model is given by:

N = [tex]N_0[/tex] × [tex]e^{(kt)}[/tex]

Where N is the number of bacteria at time t, [tex]N_0[/tex] is the starting population, e is the natural logarithm base, k is the growth rate constant, and t is time in hours.

We have two data sets: N = 125 after two hours and N = 350 after four hours. We can solve using these two equations [tex]N_0[/tex] and k.

(125) = [tex]N_0[/tex] × [tex]e^{(2k)}[/tex]

(350) = [tex]N_0[/tex] × [tex]e^{(4k)}[/tex]

Dividing the second equation by the first equation:

(350/125) = [tex]e^{(2k)}[/tex]

Taking the natural logarithm of both sides:

ln(350/125) = 2k

Solving for k:

k = ln(350/125) / 2

Now that we have k, we can plug it into either equation and solve for it. [tex]N_0[/tex]:

[tex]N_0[/tex] = 125 / [tex]e^{(2k)}[/tex]

(b) The bacterium population's exponential growth model is:

N = [tex]N_0[/tex] × [tex]e^{(kt)}[/tex]

Where [tex]N_0[/tex] = 125 / [tex]e^{(2k)}[/tex] and k = ln(350/125) / 2

(c) To calculate the number of bacteria present after 8 hours, we use the exponential growth model with t = 8:

N = [tex]N_0[/tex] × [tex]e^{(8k)}[/tex]

(d) To calculate the time when the bacterium count reaches 25,000, enter N = 25,000 into the exponentially growing model and solve for t:

25,000 = [tex]N_0[/tex] × [tex]e^{(kt)}[/tex]

t = ln(25,000 / [tex]N_0[/tex]) / k

However, in the absence of a specified growth rate constant (k) and starting population ([tex]N_0[/tex]), we are unable to determine a precise value for t.

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The question is -

The number of bacteria in the culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours.

(a) Find the initial population.

(b) Write an exponential growth model for the bacteria population. (Let t represent time in hours)

(c) Use the model to determine the number of bacteria after 8 hours.

(d) After how many hours will the bacteria count be 25,000?

The answers are given in the solution below.

A circle is a round-shaped figure that has no corners or edges. In geometry, a circle can be defined as a closed, two-dimensional curved shape.

Given is topics related to circle and its part we need to answer the question asked,

1) to 7) Given is a circle T,

a) Radius = TS, QT and RT all are the radius

b) Diameter = QS

c) Chord = PS

d) Central angle = ∠ RTQ

e) Minor arc = arc QR

f) Major arc = arc QSR

g) Semicircle = QPS

8) to 9) :-

a) Circle with radius 18 in :-

Circumference = 2π×radius = 2×3.14×18 = 113.04 in

Area = π·radius² = 3.14×18² = 1017.36 in²

b) Circle with diameter 25 m :-

Circumference = 2π×radius = 2×3.14×12.5 = 78.5 m

Area = π·radius² = 3.14×12.5² = 490.625 m²

10) The circle is having an area of 201.06 cm², we need to find the circumference and diameter,

Area = π·radius² = 201.06 cm²

radius² = 201.06 / 3.14

= 64

radius = 8 cm

Diameter = 16 cm

Circumference = 2π×radius = 2×3.14×8 = 50.24 cm

11) :-

Circle with radius P :-

The rule we will use here is :- arcs equal to central angle opposite to it, and full circle measures 360°

a) ∠ KPL = 90°

So, by linear pair sum, ∠ NPL = 90°

Now, by angle substitution law, ∠ NPM + ∠ MPL = 90°

∠ NPM = 27°

By using vertical angles rule, ∠ JPK = ∠ NPM = 27°

Therefore, arc JK = 27°

b) arc NJ = 180° - 27° = 153°

c) arc JL = 90°+27° = 117°

d) arc KNM = 360°-(90°+63°) = 207°

e) arc MJL = 360°-63° = 297°

f) arc JLK = 360°-27° = 333°

12) :-

arc CD + arc AD = 180°

Therefore,

19x-49°+5x+37° = 180°

24x-12 = 180°

24x = 192°

x = 8

Therefore,

arc CD = 5x+37 = 74°

13) :-

Length of an arc = central angle / 360° × 2π×radius

= 232° / 360° × 2 × 3.14 × 5 = 20.23 mm

14) :-

= 73° / 360° × 2 × 3.14 × 14.5 = 18.46 ft

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Answer:

The midpoint of AB is (-0.5, 0)

Step-by-step explanation:

( X1 plus X2 = -1/2 = -0.5, Y1 plus Y2 = 0

The volume of the triangular prism in cubic centimeters is 1, 632 cm³

The formula for calculating the volume of a triangular prism is expressed as;

V = L × W × H÷ 2

Such that the parameters are;

Now, substitute the values, we get;

Volume, V = 8 × 12 × 34/2

Multiply all the values

Volume, V = 3264/2

Divide the numerator by the denominator

Volume, V = 1, 632 cm³

Hence, the value is  1, 632 cm³

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One roti costs $20.00 and one pie costs $3.33.

Let x be the cost of one roti. Then, the cost of one pie is (10 - 2x) / 3.

Since the total cost is $10.00, we can set up an equation:

2x + (10 - 2x) / 3 = 10

Expanding the right-hand side:

2x + 3.33 - 2x = 10

0.33x = 6.67

Finally, dividing both sides by 0.33:

x = 20.00

So, one roti costs $20.00 and one pie costs (10 - 2 * 20) / 3 = $3.33.

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The values of n in -15<3n<6 are -4, -3, -2, 1, 0 and 1

From the question, we have the following parameters that can be used in our computation:

-15<3n<6

Divide through by 3

So, we have the following representation

-5 < n < 2

The values in this range are -4, -3, -2, 1, 0 and 1

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Answer:

5 StartRoot 10 EndRoot

Step-by-step explanation:

we know that

The legs of a 45°-45°-90° triangle are congruent

Let

x ---->  the length of one leg of the triangle

Applying the Pythagorean Theorem

where

c is the hypotenuse

a and b are the legs

we have

substitute

Simplify

5 StartRoot 10 EndRoot

Answer:

56.52cm

Step-by-step explanation:

2r = 18cm

r = 9cm

[tex]c = 2r\pi[/tex]

C = 2 × 9 × 3.14

C = 56.52cm

The x intercept of f-1(x) is the y intercept of f(x). The y intercept of f-1(x) is the x intercept of f(x). A horizontal asymptote for f(x) produces a vertical asymptote for f-1(x). A vertical asymptote for f(x) produces a horizontal asymptote for f-1(x).

(2 1/2, 0)

f(x) = 2 1/2 - 3 1/3 * x

or

f(x) = 5/2 - (10/3)*x

f^-1(x) is the inverse of f(x), which is obtained replacing f(x) by x, and x by y, and solving for y, as follows:

x = 5/2 - (10/3)*y

(10/3)*y = 5/2 - x

y = (5/2)*(3/10) - x*(3/10)

y = (3/4) - (3/10)*x

f^-1(x) = (3/4) - (3/10)*x

at x-intercept, f^-1(x) = 0,

(3/4) - (3/10)*x = 0

(3/4) = (3/10)*x

x = (3/4)*(10/3)

x = 5/2 or 2 1/2

Answer:

x=54⁰ y= 43⁰ z= 83⁰

Step-by-step explanation:

z=180⁰-97⁰

83⁰ opposite angles add upto 180⁰

y= 43⁰

x= 83⁰+43⁰=126⁰

180⁰-126⁰= 54⁰ (alternate angles)

The subject's heart rate is 100 beats per minute.

There are three main methods of calculating ECG rate. There is no specific best method, and preference varies between clinicians. However, certain methods may be better suited for rhythms such bradyarrhythmia's or tachyarrhythmias.

To calculate the heart rate from an ECG recorded on millimeter grid paper, you can use the following formula:

Heart rate (beats per minute) = (recording speed (mm/s) / distance between cycles (mm)) x 60 s/min

Using the given information, the calculation would be:

Heart rate (beats per minute) = (25 mm/s / 15 mm) x 60 s/min = 100 beats per minute

Therefore, the subject's heart rate is 100 beats per minute.

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The requried graph of the solution of a set of given inequality 13 > 5+ 4x is shown.

Inequality can be defined as the relation of the equation containing the symbol of ( ≤, ≥, <, >) instead of the equal sign in an equation.

here,
Given inequality,
13 > 5 + 4x

Simplify the above expression,
Subtract -5 from both sides,
13  - 5 > 5 - 5 + 4x
8 > 4x

Divide by 4 into both sides
2 > x

The graph of the solution to the given inequality is less than 2, and line x = 2 will be a dotted line [value no included in x < 2]

Thus, the graph of the inequality has been shown.

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No a subspace of a finite dimensional vector space cannot be an infinite dimensional vector space

This is due to the fact that a subspace is a subset of a larger vector space and must have the same dimension as its parent vector space. In other words we can say that, if the parent vector space is finite dimensions,then the subspace must be as well.

To put it in another way, a vector space is finite dimensional if it can be traversed by a limited number of vectors. A subspace can only be spanned by a subset of the vectors that span the parent vector space since it is a subset of a larger vector space. As a result, if the parent vector space has finite dimensions, the subspace must be as well.

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A statement about the data which must be true include the following: A. The spread from the lower quartile to the median is greater than the spread from the median to the upper quartile.

In Mathematics, a box plot is a type of chart that is used for the graphical or visual representation of the five-number summary of a data set with respect to locality, skewness, and spread.

Based on the information provided above, the five-number summary for the given data set include the following:

Spread from lower quartile (first) to median = 7 -4  = 3

Spread from median to upper quartile (third) =  9 - 7 = 2

Therefore, the spread from lower quartile (first) to median is greater than the spread from median to upper quartile (third).

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Simple Random sampling  as each student is getting equal opportunity to get selected.

Describe random sampling.

A selection of participants from a community are chosen at random by the investigator using simple random sampling, a sort of sampling techniques. Every individual in the population has the same chance of being chosen. Then, information is gathered from as much of this randomly selected subgroup as possible.

Which four forms of random sampling are there?

Simple random sampling, systematic sampling, stratified sampling, and cluster sampling are the four main random (probability) sampling techniques.

What benefit may simple random sampling provide?

The benefits of a simple random sample include its simplicity and accuracy of depiction. Simple random sampling is the easiest way to select a study sample from a bigger population.

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To calculate the 97% confidence interval, we can use the following formula:

CI = (mean - (critical value) * (standard deviation / square root of sample size), mean + (critical value) * (standard deviation / square root of sample size))

Where critical value is the t-value that corresponds to 97% confidence level and degrees of freedom (df) equal to n-1.

Using a t-distribution table with df = 103, the critical value is 1.98.

Putting  in the numbers:

CI = (12.05 - (1.98) * (0.08 / sqrt(104)), 12.05 + (1.98) * (0.08 / sqrt(104)))

CI = (12.05 - (1.98) * (0.08 / 10.197), 12.05 + (1.98) * (0.08 / 10.197))

CI = (12.05 - 0.0177, 12.05 + 0.0177)

CI = (12.0323, 12.0677)

So the 97% confidence interval for the mean amount of soda in a can is (12.0323, 12.0677) ounces.

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The area of this region is equal to [tex]\pi \cdot (\sqrt{35})^2 = 35\pi[/tex]

The equation for the set of complex numbers z such that the real part of 1/z is equal to 1/6 is given by:

Re(1/z) = 1/6

Since 1/z = 1/x + i/y,

Where x and y are the real and imaginary parts of z, respectively,

we can write the equation as:

(1/x)=(1/6) and [tex]$\frac{y}{x^2 + y^2} = \frac{1}{6}$[/tex]

From the first equation,

we have x = 6.

Substituting this value into the second equation, we get:

[tex]$\frac{y}{36 + y^2} = \frac{1}{6}$[/tex]

Solving for y,

we find that [tex]$y = \pm \sqrt{35}$[/tex].

So, the set of complex numbers z that satisfies the equation forms a circle centred at 6 + 0i with radius [tex]$\sqrt{35}$[/tex].

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1: The number of dogs is greater than 20

2: The temperature was less than 80°

3: The cost of the bike is atleast $100.

4: The grocery list does not exceed 15 items. The speed limit is not more than 40mph

Largest even integer which cannot be written as the sum of two odd composite numbers is 38 if it is divisible by at least one positive integer other than 1 and itself.

The positive even integers which cannot be expressed as the sum of 2 composite odd numbers are: 2,4,6,8,10,12,14,16,20,22,26,28,32,38. This sequence is A118081.

All we have to do now is check the even numbers smaller than  44

. The largest,  42 is a multiple of  3 so it’s handled as  42=9+33 and the next one down,  40 is handled as  40=25+15.But the next one down is our culprit:  38 is not the sum of two odd composite numbers, as you can readily check.

First, what are these “odd composite numbers” anyway? The number  1is considered neither prime nor composite (it’s a unit), so it’s out.  3,5 and  7 are prime. The smallest odd composite number is, therefore,  9 and the next one is  15 .So we have  18=9+9 24=9+1 and  30=15+15 as some even numbers which can be written as a sum of two odd composites, but so far it doesn’t look promising: plenty of even numbers, like  10 or  20 or  32 cannot be so written.

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The probability that 3 individuals have conditions caused by outside factors is 0.1496

The proportion of heart failures due to outside factors, p = 11% = 0.11

Sample size, n = 15

The formula for binomial distribution is:

                    P(x) = ⁿCₓ pˣ (1 - p)ⁿ⁻ˣ

Here, x = Number of heart failures.

We are asked to determine the probability that 3 individuals have conditions caused by outside factors

So, here x = 3

                    P(3) = ¹⁵C₃ p³ (1 - p)¹⁵⁻³

                    P(3) = ¹⁵C₃ (0.11)³ (1 - 0.11)¹²

                    P(3) = ¹⁵C₃ (0.11)³ (0.89)¹²

                    P(3) = 455 (0.11)³ (0.89)¹²

                    P(3) = 0.1496

Hence, the probability that 3 individuals have conditions caused by outside factors is 0.1496

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Answer:

D) 12/16 = 36/48

Step-by-step explanation:

They are equivalent fractions, unlike the other options. Both of these fractions simplify to 1/3 so they are indeed equivalent.

Answer:

12/16 = 36/48

Step-by-step explanation:

because 12/16 multiplyed by 3 is 36/48

the correct expression for the Perimeter of the Rectangle will be  8w, 2w + 6w, and  2 (w + 3w).

The perimeter of a form is the space surrounding its edge. Find the perimeter of various forms by summing the lengths of their sides.

Given, The length of a rectangle is 3 times the width, w

Since,

width of the rectangle = w

Length of the rectangle = 3w

From the general formula of the Perimeter of the Rectangle:

Perimeter = 2(Length + width)

Perimeter = 2 (w + 3w)

Perimeter = 2w + 6w

Perimeter =  8w

Therefore, the correct expression for the Perimeter of the Rectangle will be  8w, 2w + 6w, and  2 (w + 3w).

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Answer:

Points R(4,1) S(7,3) T(6,4) after translation

R(4-3, 1) S(7-3, 3) T(6-3, 4)

R'(1, 1) S'(4, 3) T'(3, 4)

Points R'(1, 1) S'(4, 3) T'(3, 4) after reflection

R''(1, -3) S''(4, -5) T''(3, -6)

Step-by-step explanation:

Answer:Step-by-step explanation:Points R(4,1) S(7,3) T(6,4) after translation R(4-3, 1) S(7-3, 3) T(6-3, 4) R'(1, 1) S'(4, 3) T'(3, 4) Points R'(1, 1) ...

The y intercept represents the amount of snow in inches on his lawn at noon

An equation is an expression that uses mathematical operations to show the relationship between numbers and variables. Types of equations are linear, quadratic, cubic and so on.

The standard form of a linear equation is:

Ax + By = C

Where A, B and C are constants

The slope intercept form of a linear equation is:

y = mx + b

Where m is the slope and b is the y intercept

If y represents the number of inches of snow on the lawn at x minutes past noon.

The y intercept represents the amount of snow on his lawn at noon

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