In a grade 7 class,There are 30 students in a class 18 of them own at least one pet.What percent of them have pets.Answer is 60 percent but how do i do the work.NEED URGENT RESPONSE

Answer:

b

Step-by-step explanation:

Open up the second bracket by changing all signs to the opposite

2a²-3ab+5b² -a²+2ab-3b²

=a²-ab+2b²

Answer:

b

Step-by-step explanation:

calculate the length using the distance formula

d = [tex]\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }[/tex]

with (x₁, y₁ ) = (- 1, 4 ) and (x₂, y₂ ) = (2, - 5 )

d = [tex]\sqrt{(2-(-1))^2+(-5-4)^2}[/tex]

   = [tex]\sqrt{(2+1)^2+(-9)^2}[/tex]

   = [tex]\sqrt{3^2+81}[/tex]

   = [tex]\sqrt{9+81}[/tex]

   = [tex]\sqrt{90}[/tex]

   = [tex]\sqrt{9(10)}[/tex]

   = [tex]\sqrt{9}[/tex] × [tex]\sqrt{10}[/tex]

   = 3[tex]\sqrt{10}[/tex]

She earned $12 at 4% interest rate. The solution has been obtained by using simple interest.

What is simple interest?

Simple interest is the cost of borrowing that is computed using the original principal amount alone and a constant interest rate.

We are given that Lauren deposited $300 to start her savings account and after one year, she had $312 in her account.

This means that the difference between both the amounts is the interest because it is mentioned that she did not deposit or withdraw any money that year.

So, the interest is $12.

The rate of interest is found using simple interest

⇒S = p*r*t

⇒12 = 300*r*1

⇒0.04 = r

This means that interest rate is 4%.

Hence, she earned $12 at 4% interest rate.

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a. Pair 2 is selected.

b. Respiratory system, its function is to breathe. Digestive system, its function is to break down food into nutrients.

c. The two systems work together by sharing the region of the mouth and upper throat.

First picture in Pair 2 is Respiratory system, which its function is to breathe. Second picture in Pair 2 is Digestive system, which its function is to break down food into nutrients such as carbohydrates, fats and proteins. The respiratory system takes in oxygen from the air, and also gets rid of carbon dioxide. The digestive system absorbs water and nutrients from the food we consume.

The respiratory system is mainly used to transport air, whilst the digestive system is used to transport fluids and solids, from water and food we eat. The respiratory and the digestive systems share the area of the mouth and upper throat, in which air, fluids, and solids can be mixed.

The digestive system does homeostasis by ensuring that the stomach area has the right pH balance. The body uses both positive and negative mechanisms to perform homeostasis. If the body detects an imbalance, the other systems work together to counterbalance and restore the right equilibrium.

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The time it takes for the wave to travel from point A to point B is 0.0086 seconds.

Assuming the question is referring to a sinusoidal wave with a frequency of 50 Hz, we can use the wave speed formula to calculate the time it takes for the wave to travel from point A to point B.

Wave speed (v) = frequency (f) x wavelength (λ)

Since the frequency is given as 50 Hz, we need to determine the wavelength to find the wave speed.

To calculate the wavelength, we can use the distance between two consecutive points on the wave that is in phase, such as points A and D or B and C. From the given information, we know that the distance between A and D or B and C is one wavelength. Therefore, we can calculate the wavelength as follows:

wavelength (λ) = distance between A and D or B and C = 10 m - 3 m = 7 m

Using the wave speed formula and the calculated wavelength, we can find the wave speed:

v = f x λ = 50 Hz x 7 m = 350 m/s

Now we can use the wave speed formula to find the time it takes for the wave to travel from point A to point B:

v = d / t

where d is the distance between A and B (which is 3 m) and t is the time it takes for the wave to travel that distance.

Rearranging the formula, we get:

t = d / v = 3 m / 350 m/s = 0.0086 s

Therefore, the time it takes for the wave to travel from point A to point B is 0.0086 seconds.

To find the amplitude of the wave, we would need additional information, as the amplitude is the maximum displacement of the wave from its equilibrium position.

As for whether points A and B are in phase, we need to compare the phase difference between the two points to the wave period. The period of a wave is the time it takes for one complete oscillation, and it is given by:

period (T) = 1 / frequency (f) = 1 / 50 Hz = 0.02 s

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The triangle DEF's section EF measures 24 units in length.

As per the data given in the above question are as bellow,

The provided details are as follow,

Procedure: Calculating the length that results from distorting a triangle by a scale factor

The triangle mentioned in the previous sentence is summarised in the diagram below. Using a trigonometric relationship, we discover that the following formula best describes the length of the section EF:

[tex]$\sin a^{\circ}=\frac{E F}{D E}$[/tex]

If we know that DE=30 and [tex]$\sin a^{\circ}=\frac{4}{5}$[/tex], then the length of the segment EF is:

[tex]E F=D E \cdot \sin a^{\circ} \\& E F=30 \cdot\left(\frac{4}{5}\right) \\[/tex]

EF=24

Sine (sin), cosine (cos), and tangent (tan), which are defined in terms of the ratios of the sides of a right triangle, are the fundamental trigonometric functions.

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Note: The correct question would be as bellow,

A triangle was dilated by a scale factor of 6. If sin a° = four fifths and segment DE measures 30 units, how long is segment EF?triangle DEF in which angle F is a right angle, angle D measures a degrees, and angle E measures b degrees

15.5 units

24 units

30 units

37.5 units

The length of the base of the triangle is 40ft

A triangle is a polygon with three sides, three angles, three vertices, and sum of angles is s 180 degrees

The given parameters that will help us to solve the problem are

The area of the triangle is given as

Area = 1/2 *b*h

Area = 1/2*b*5 = 100

Area = 5b/2 = 100

Area = 5b = 200

Making b the subject of the relation

b= 200/5 =40 ft

Therefore the response for 40 ft is correct

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Answer: No solution

Step-by-step explanation:

6x + 12 = 2(3x + 6)

Expand the right side:

6x + 12 = 6x + 6

Subtract 6x from both sides:

12 = 6

This is obviously not true, so there are no solutions to this equation :>

The coordinates of the centroid of triangle ABC are given as follows:

(-1, 4).

The coordinates of the centroid of a triangle are obtained finding the mean of the coordinates of the three vertices of the triangle.

This means that the x-coordinate of the centroid of triangle ABC is given as follows:

(-1 + 2 - 4)/3 = -1.

(mean of the x-coordinates of each of the three vertices).

The y-coordinate of the centroid of triangle ABC is given as follows:

(10 + 1 + 1)/2 = 4.

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Diana and Melissa are correct based on the description of the rhombus's appearance. Option C. is correct.

Moving from the details to the fact to make judgements is known as inductive reasoning. Inferential reasoning, which involves moving from known facts to precise conclusions, is typically used to determine it.

A parallelogram's special case is the rhombus.

In a rhombus, the opposing sides and angles are parallel and equal.

The sides of a rhombus are all the same length, while the diagonals are split at right angles. The rhombus is frequently referred to as a diamond or rhombus.

It can be inferred that Melissa and Diana are correct to claim that the image is a rhombus from the description of rhombus attributes.

The given question is incomplete. The complete question is 'Who is correct?

An image shows two quadrilaterals. They are facing different directions, but each of them has two pairs of opposite sides that are parallel and equal in length.

A. Diana is correct. Only the quadrilateral on the right has two pairs of parallel sides and all sides the same length.

B. Melissa is correct. Only the quadrilateral on the left has two pairs of parallel sides and all sides the same length.

C. Both are correct. Both quadrilaterals have two pairs of parallel sides and all sides the same length.

D. Neither is correct. Neither figure has all sides the same length.'

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Quantitative variables provide numerical measures that can be added/subtracted with meaningful results.

Discrete variables are quantitative and have a finite or countable number of positive values.

Continuous variables are quantitative and have an infinite number of possible values that are not countable and also measure with some sort of scale that uses numbers.

Qualitative variables allow for the classification of individuals based on some attribute or characteristic and also provide numerical measures of individuals.

Arithmetic operations such as addition and subtraction can be performed on the values of a quantitative variable and will provide meaningful results.

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Answer:

In a rhombus, all sides are equal. Therefore, you can set WV (s+12) and UV (3s) equal to each other.

s+12 = 3s

Subtract s from both sides, so the variables are all on one side.

12 = 2s

Divide both sides by 2 to isolate the variable.

6 = s

UV = 3s

UV = 3(6)

UV = 18

Step-by-step explanation:

so much sorry about that

Answer: 2^43000000 (the answer is impossibly large)

The inequality that is modeled by the graph is 2x + 5y ≥ 14; x ≥ 0

This inequality corresponds to the solid line that passes through the ordered pairs (0,3) and (7,0). The line has a slope of -2/5, and it can be written in the form y = (-2/5)x + b, where b is the y-intercept, and it can be calculated as b = (5/2)x + 14. The shading is below the line and in the first and fourth quadrants, which corresponds to the inequality 2x + 5y ≥ 14; x ≥ 0.

The other inequalities provided in the options do not correspond to the graph:

   2x + 5y ≤ 14; x ≥ 0, the shading is above the line

   2x − 5y ≤ 14; x ≥ 0, the slope is positive and the shading is above the line

   −2x − 5y ≤ 14; x ≥ 0, the slope is positive and the shading is above the line

So, the inequality that is modeled by the graph is 2x + 5y ≥ 14; x ≥ 0

Answer:

There is a difference of 51 degrees

Step-by-step explanation:

-13 to zero is 13 degrees

zero to 38 degrees is 38 degrees

13 + 38 is an increase of 51 degrees

Answer:

11 and 12

Step-by-step explanation:

Solving this would be the case of finding that square root of 131, then rounding both up and down.

First, to solve

The square root of 131 is 11.45

Now we take that 11.45 and round both up and down

Rounding down is 11 and rounding up is 12.

11 and 12 are next to each other, making them consecutive.

Answer:

I think its 11 and 12

Step-by-step explanation:

The graph does not represent y as a function of x, as each value of x is mapped to two outputs.

The portion that could be removed to make it a function is given as follows:

y < 0.

Hence the domain and the range are given as follows:

A relation represents a function when each input value is mapped to a single output value.

On the circle, a vertical line through the circle would cross the line twice, meaning that each input is mapped to two outputs, hence the relation is not a function.

We have to remove one of the outputs for the relation to be a function, hence, removing y < 0, the domain and the range are given as follows:

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The initial battery charge was of:

19%.

The time it takes for the battery to be full is of:

32.4 minutes.

The linear function in slope-intercept format is given as follows:

y = mx + b

In which:

Each minute , the percentage of battery’s capacity that was charged increased by 2.5 percent, hence the slope m is given as follows:

m = 2.5.

Hence:

y = 2.5x + b.

After 17 minutes of charging the battery was 61.5 percent full, hence when x = 17, y = 61.5, and the intercept b is obtained as follows:

61.5 = 2.5(17) + b

b = 61.5 - 2.5 x 17

b = 19.

The battery is fully charged when y = 100, hence the time is obtained as follows:

2.5x + 19 = 100

2.5x = 81

x = 81/2.5

x = 32.4 minutes.

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The five different vocabulary words that could be used to describe the expression are

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

a-d+c

Using the above as a guide, the vocabulary words and the meanings are as follows

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Answer:

3(x-5)

Step-by-step explanation:

Answer:

3(x - 5)

Step-by-step explanation:

Make terms..

x + 2x - 15 =

3x - 15

Now lets find a common factor of them..

3x - 15

3(x - 5)

Thus,

3(x - 5), Is your answer

To solve the triangle, or identify unknown portions in terms of known portions, we can apply the Pythagorean theorem and the properties of sines, cosines, and tangents. The x is  8 .

To solve the triangle, or identify unknown portions in terms of known portions, we can apply the Pythagorean theorem and the properties of sines, cosines, and tangents.

Pythagorean theorem: a2 + b2 = c2.

Sine: sin A=a/c, sin B=b/c.

Cosines: cos A = b/c, cos B = a/c.

Identity based on trigonometry

cos x sin (90-x)

therefore, if we have

(4x plus 10) o = Cos (6x)

(4x plus 10) o = Sin (90- 6x)

4x + 10 = 90 - 6x

4x+6x = 90 - 10

10x = 80

x = 80/10

x = 8

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By evaluating the given equation, we will see that they made 1,524 dollars by selling tickets.

We know that each adult ticket costs $12 and each student ticket costs $9, then the expression for the total cost is:

c(a, b) = 12a + 9s

Where a is the number of adults and s is the number of students.

Here we know that there where 64 adults and 84 students, so the total cost will be:

c(64, 84) = 12*64 + 9*84 = 1,524

They made $1,524 by selling tickets.

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The number of algae after 7 days is approximately 70.

Percentage is defined as the parts of a number per fraction of 100. We have to divide a number with it's whole and then multiply with 100 to calculate the percentage of any number.

Given that,

Initial population of algae = 50

Percentage increase = 5%

To calculate the number of algae at any day, we need to find a formula.

Initial population = 50

After 1 day, population = 50 + (5% × 50) = 50 + (0.05 × 50) = 50 (1 + 0.05)

After 2 days, population = 50 (1 + 0.05)²

So, population after n days = 50 (1 + 0.05)ⁿ

Population of algae after 7 days = 50 (1 + 0.05)⁷

                                                      = 50 (1.05)⁷

                                                      = 70.355 ≈ 70

Hence there will be approximately 70 algae after 7 days.

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Answer: 32082.2

Step-by-step explanation:

Based on the given conditions, formulate:: 341300 * (2.3% + 4.4% + 2.7%)

Calculate the sum or difference: 341300 * 0.094

Calculate the product or quotient: 32082.2

Step-by-step explanation:

Answer:

11/20

Step-by-step explanation:

Add 1/5 and 1/4. You get 9/20.

Subtract that from 1 and you get 11/20 :)

Answer:

11/20

Step-by-step explanation:

1/5+1/4

4/20+5/20= 9/20

20/20-9/20=11/20

Answer: To find the time it takes for the toy boat to bob down from its peak to a height of -35 cm, we need to find the value of t when H(t) = -35.

So, we can substitute -35 for H(t) in the given equation:

5 cos (2π/3t) - 35.5 = -35

Now we can solve for t by isolating it on one side of the equation:

5 cos (2π/3t) = 0.5

cos (2π/3t) = 0.1

2π/3t = cos^-1(0.1)

3t = 2π * cos^-1(0.1)/π

t = 2 * cos^-1(0.1)

The time it takes for the toy boat to bob down from its peak to a height of -35 cm is approximately 2 * cos^-1(0.1) seconds.

Step-by-step explanation:

Answer:

[tex]7x - 21 = 11x - 73 \\ \dashrightarrow \: 11x - 7x = 73 - 21 \\ \dashrightarrow \: 4x = 52 \\ \ \: \: \: \: dividing \: both \: sides \: by \: 4 \\ \dashrightarrow \: \cancel \frac{4x}{4} = \cancel \frac{52}{4} \\ \\ \dashrightarrow \: \: \boxed{ x = 13}[/tex]

hope helpful :)