In a group of 120 seventh graders. 30% have completed their science project. How many students have completed their science project.

Answer:

43.65  grams of bird feed containing 5% seed must be added to get bird feed that is 40% seed

Step-by-step explanation:

Let us assume the total capacity of the container  = m grams

Here, given: 80% of m = 100 grams

[tex]\implies \frac{80}{100} \times m = 100\\\implies m = \frac{100 \times 100}{80} = 125[/tex]

or, the TOTAL CAPACITY of container  = 125 grams

Now, the container already has 5 % seeds.

Calculating 5% of the capacity, we get:

[tex]\implies \frac{5}{100} \times 125 = 6.25[/tex]

So, the container already has 6.25 grams.

Now, the total filling of the container should be 40%.

Calculating 40% of the capacity, we get:

[tex]\implies \frac{40}{100} \times 125 = 50[/tex]

So, the weight of seeds that NEEDS To be in total  = 50 grams.

Also, it already has  6.35 grams.

So, the weight of seeds to be added  = 50 grams - 6.35 grams

                                                                   = 43.65 grams

Hence, 43.65  grams of bird feed containing 5% seed must be added to get bird feed that is 40% seed.

43.75  grams of bird feed containing 5% seed must be added to get bird feed that is 40% seed  

Percentage is a number or ratio that can be expressed as a fraction of 100.

Let the total mass of the container = x

Therefore,

80% of x = 100g of bird feed

80 / 100 × x = 100

80x = 10000

x = 10000 / 80

x = 125 grams

Therefore, 5% volume will be as follows;

Therefore, 40% volume is as follows:

Finally, the weight to be added to make the bird feed 40% seed is as follows;

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Answer:

B) y = x + 2 and y = -x - 4

Step-by-step explanation:

The equation of a line is represented with y = mx + b.

"x" and "y", when substituted, tell you if a point (x, y) is on the line.

"m" is slope, and tells if it goes up (positive slope) or down (negative)

"b" is the y-intercept, when the line hits the y-axis.

In the graph, we have two lines. One goes upwards (read from left to right), and the other goes downwards.

The graph that goes upwards hits the y-axis at positive "2".

The graph that goes downwards hits the y-axis at (negative) "-4".

Since the choices only have positive 1 or negative 1 as the slope, we only have to worry if it goes up or down.

Take the key information, slope and y-intercept, to write the equations.

"upwards slope, y-axis at 2"

y = x + 2

"downwards slope, y-axis at -4"

y = -x - 4

Answer:

5xA-5xB

Step-by-step explanation:

Answer: 5a-5b

Step-by-step explanation: Distribute the 5 and carry the negative sign over

Answer:

Step-by-step explanation:

7/9x + 2 = 5/6.....multiply by the common denominator of 18

14x + 36 = 15 <=== re-written without fractions

14x = 15 - 36

14x = -21

x = -21/14

x = - 3/2...(or - 1 1/2)...ur solution

To rewrite the equation 7/9x + 2 = 5/6 without fractions, we multiply every term by the least common denominator (18) to get 14x + 36 = 15. Subtracting 36 from both sides and solving for x results in x = -21/14.

In order to rewrite the equation without fractions, we can eliminate the fractions by finding the least common denominator (LCD) and multiplying every term in the equation by it.

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Answer:50/50

Step-by-step explanation:

It’s a 50/50 chance because there is only two sides to a coin

Answer:

+56

Step-by-step explanation:

Answer:

(4,3)

Step-by-step explanation:

The orthocenter of a triangle is the point of intersection of the altitudes of the triangle .

The vertices are:

A(-2,5), B(6,5), and C(4,-1)

Slope of (6,5), and (4,-1) is

[tex]m = \frac{5 - - 1}{6 - 4} = 3[/tex]

Slope of altitude through A is

[tex] - \frac{1}{3} [/tex]

The equation of the altitude through A is

[tex]y - 5 = - \frac{1}{3} (x - - 2)[/tex]

[tex]y = - \frac{1}{3} x + \frac{13}{3} [/tex]

The slope of A(-2,5), B(6,5) is zero because it is a horizontal line.

The equation of altitude through (4,-1) will be the vertical line x=4.

This implies that,

[tex]y = - \frac{4}{3} + \frac{13}{3} = 3[/tex]

Hence the orthocenter is (4,3)

Answer:

Step-by-step explanation:

student teacher ratio of 5:2....added = 7

so students make up 5/7 of the total people and teachers make up 2/7 of the total people.

Last year.....56 people

students : 5/7 * 56 = 280/7 = 40 students

teachers : 2/7 * 56 = 112/7 = 16 teachers

this year....70 total people

students : 5/7 * 70 = 350/7 = 50 students

teachers : 2/7 * 70 = 140/7 = 20 teachers

Final answer:

To find the number of students and teachers based on their ratio and total count, we applied the ratio of 5:2 to the total counts of 56 and 70 for the last year and this year, respectively. This calculation revealed there were 40 students and 16 teachers last year, and 50 students and 20 teachers this year.

Explanation:

The student has asked about finding the number of students and teachers at a preschool in two different years based on a given student-to-teacher ratio and the total count of students and teachers for those years.

Step-by-Step Solution:

First, understand the ratio of students to teachers is 5:2. This means for every 5 students, there are 2 teachers.

To solve for last year, we have a total of 56 individuals (students and teachers). Let's represent students as 5x and teachers as 2x, given their ratio. Therefore, 5x + 2x = 56, solving this gives us x = 8. This means there were 40 students (5*8) and 16 teachers (2*8) last year.

For this year, we have a total of 70 individuals. Using the same method, 5x + 2x = 70, we find that x = 10. This means there are 50 students (5*10) and 20 teachers (2*10) this year.

By understanding and applying the concept of ratios, we were able to find the number of students and teachers for both years.

Answer:

predictable

Step-by-step explanation:

the opposite of random is predictable

The opposite of 'random' would be a word like 'ordered' or 'systematic', which suggest a set plan or sequence, contrasting with the concept of randomness.

The opposite of the word 'random' would be a term that denotes a sense of order, structure, or predictability. In this context, one example of a word that is the opposite of 'random' is 'ordered' or 'systematic'. These words suggest that things are arranged or occur according to a set plan or sequence, thereby contrasting with the concept of 'random', which indicates a lack of any discernible order or pattern.

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Answer:

C

Step-by-step explanation:

120° is an angle in the second quadrant.

The reference angle is the related acute angle in the first quadrant, that is

reference angle = 180° - 120° = 60° → C

Answer:

C

Step-by-step explanation:

Answer:

Length = 10.5units,Area = 68.25 unit²

Step-by-step explanation:

Perimeter =34 units

Width =6.5 units

Perimeter = l+l+w+w

Where l= length and w= width

34 = l + l + 6.5+ 6.5

34.= 2l + 13

Subtract 13 from both sides

2l = 34 - 13

2l = 21

Divide both sides by 2

L= 21/2

Length = 10.5units

If we are to find the area.

Area = length x width

Area = 10.5 × 6.5

Area = 68.25 unit²

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It is true that the solution set of an equation of a circle is all of the points that lie in the circle

The equation of a circle is represented as:

(x - a)^2 + (y - b)^2 = r^2

Where:

Center = (a,b)

Radius = r

The points are represented by (x,y)

The (x,y) can take any value as long as it makes the equation (x - a)^2 + (y - b)^2 = r^2 to be true

Hence, it is true that the solution set of an equation of a circle is all of the points that lie in the circle

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Answer:

False

Step-by-step explanation:

a) Probability of both being males is 27%

b) Probability of both being females is 23%

c) Probability of having exactly one male and one female is 50%

Step-by-step explanation:

a)

The probability that the birth is a male can be written as

[tex]p(m) = 0.52[/tex] (which corresponds to 52%)

While the probability that the birth is a female can be written as

[tex]p(f) = 0.48[/tex] (which corresponds to 48%)

Here we want to calculate the probability that over  2 births, both are male. Since the two births are two independent events (the probability of the 2nd to be a male  does not depend on the fact that the 1st one is a male), then the probability of both being males is given by the product of the individual probabilities:

[tex]p(mm)=p(m)\cdot p(m)[/tex]

And substituting, we find

[tex]p(mm)=0.52\cdot 0.52 = 0.27[/tex]

So, 27%.

b)

In this case, we want to find the probability that both children are female, so the probability

[tex]p(ff)[/tex]

As in the previous case, the probability of the 2nd child to be a female is independent from whether the 1st one is a male or a female: therefore, we can apply the rule for independent events, and this means that the probability that both children are females is the product of the individual probability of a child being a female:

[tex]p(ff)=p(f)\cdot p(f)[/tex]

And substituting

[tex]p(f)=0.48[/tex]

We find:

[tex]p(ff)=0.48\cdot 0.48=0.23[/tex]

Which means 23%.

c)

In this case, we want to find the probability they have exactly one male and exactly one female child. This is given by the sum of two probabilities:

- The probability that 1st child is a male and 2nd child is a female, namely [tex]p(mf)[/tex]

- The probability that 1st child is a female and 2nd child is a male, namely [tex]p(fm)[/tex]

So, this probability is

[tex]p(mf Ufm)=p(mf)+p(fm)[/tex]

We have:

[tex]p(mf)=p(m)\cdot p(f)=0.52\cdot 0.48=0.25[/tex]

[tex]p(fm)=p(f)\cdot p(m)=0.48\cdot 0.52=0.25[/tex]

Therefore, this probability is

[tex]p(mfUfm)=0.25+0.25=0.50[/tex]

So, 50%.

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The answer is B (153) on Edge.

The X-ray machines were sold last year in total is 157.

A commission is a sum of money that a salesperson receives for each transaction they make. If a salesman is compensated on commission, their pay is based on how much they sell. Salespeople are paid only on commission.

We have,

The company can sell an x-ray machine which cost $508.17 to produce for $1.295.75.

So, the number of x-ray machines that were sold last year by Khybar inc.

= 79558.59/508.17

= 156.5

= 157

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Answer:

(8,8)

Step-by-step explanation:

The image point of (3,7) after translation 5 units to the right and 1 unit up is (8,8).

Translation of a point in a coordinate plane involves moving the point to a new location without changing its orientation or size.

To find the image of a point (3,7) after a translation of 5 units to the right and 1 unit up, we simply add the translation amounts to the original coordinates.

For a rightward movement, we add 5 to the x-coordinate, and for an upward movement, we add 1 to the y-coordinate.

Therefore, the new position of the point after translation will be:

So, the image point after the translation is (8,8).

Answer:

52.1

Step-by-step explanation:

The given expression is 36 - [-49 + 32.9]

First we have to simplify the numbers which are in parenthesis.

= 36 -(-16.1)

Here -(-16.1) = + 16.1          

So, we get

= 36 + 16.1

= 52.1

The answer is 52.1

The total number of blue cards in the game = 48

Step-by-step explanation:

Total number of blue and yellow cards = 84

let the blue card denote B and yellow card as Y

B = 4

Y = 3

Total number of cards in one round = 7

number of rounds possible = total number of cards / number of cards in one round

= 84/7

= 12

number of blue cards = 12 x 4

= 48

  The total number of blue cards in the game = 48                                                                                                              

Answer:

48

Step-by-step explanation:

Answer:

1.17

Step-by-step explanation:

this is because first you would do 14÷12 as 14 is yearly and you want to find the monthly percentage this gives you 1.1666666667. then the next step is to round it so you would round 1.1666666667 to 1.17 for hundredth of a percent

14÷12=1.1666666667

round 1.1666666667 to 1.17

hoped this helped

The expression demonstrates distributive property.

Explanation:

The given expression is [tex]17 \times 102[/tex]

Thus, solving the expression results in [tex]1734[/tex]

One student rewrote this expression as [tex]17(100+2)[/tex]

Then, simplified the expression as

[tex]1700+34[/tex]

Thus, [tex]17(100+2)=1700+34[/tex]

The expression demonstrates distributive property and the property can be generally written as

[tex]$a(b+c)=a b+a c$[/tex]

The given expression [tex]17(100+2)[/tex] is of the form [tex]$a(b+c)$[/tex]

Hence, The expression demonstrates distributive property.

Answer:

  C) -9

Step-by-step explanation:

Exponents in a polynomial must be positive integers. Since your ? has a minus sign in front, its value must be negative. The only such choice is C.

Answer:

width = 1.8 in

length =   3.6 in

height =[tex]8-3w =8-3(1.8)= 2.6 in[/tex]

Step-by-step explanation:

A designer is making a rectangular prism box with maximum volume, with the sum of its length, width, and height 8 in

Let l , w and h are the length , width and height

[tex]l +w+h=8\\l=2w[/tex]

Plug it in the first equation

[tex]2w+w+h=8\\3w+h=8\\h=8-3w[/tex]

volume the box is length times width times height

[tex]volume = (2w)(w)(8-3w)\\16w^2-6w^3[/tex]

To get maximum volume we take derivatived

[tex]v'=32w-18w^2[/tex]

set the derivative =0 and solve for w

[tex]0=32w-18w^2\\0=-2w(9w-16)\\w=0 , w= \frac{16}{9}[/tex]

width = 1.8 in

length = 2w= 3.6 in

height =[tex]8-3w =8-3(1.8)= 2.6 in[/tex]

Answer: I think it's True :)

Answer:

I feel like it true. Happy yo help!!!

Step-by-step explanation:

Hmmm.... do you mean 0.8888...... or just 0.8888.

If you mean point eight repeating the fraction equivalent is just 8/9.

Answer:

y = (1/12)*x + 7/4

Step-by-step explanation:

y=−12x−1

Perpendicular line:

y = a*x + b

y = (1/12)*x + b

2 = (1/12) * 3 + b

2 = (3/12) + b

2 = 1/4 + b

2 - 1/4 = b

7/4 = b

Perpendicular line:

y = (1/12)*x + 7/4

Answer:

the answer is 0

Step-by-step explanation:

well - 3 plus 3 would just by 0 because if the number with the negative is the biggest then the answer is negative but if the positive number is the biggest then the answer would be positive because there is not a bigger number it would be 0 because 3 and -3 have pretty much the same value other then them being negative and positive

Answer:

z = -8.46 - 3.08i.

Step-by-step explanation:

cos 200 = -0.93969 so 9 * cos 200 = -8.46 to the nearest hundredth.

sin 200 = -0.3420 so 9 * sin 200 = -3.08 to nearest hundredth.

Answer:

Infinitely many solutions

Step-by-step explanation:

If we have a system of equation like:

2x+y=4

6x+3y=12

If we make y the subject in the first equation and substitute into the second equation, we get:

6x+3(4-2x)=12

We expand to get:

6x+12-6x=12

6x-6x+12=12

Now the variable adds out to give:

12=12

This statement is true so the equation has infinitely many solution.

Answer:

Explanation:

When the variable adds out means that after all the simplifications, at the end, it will not appear in the final sentence or expression.

Then, if the final sentence is true, and not variable appears, but only constants, the sentence is always true, no matter what value the variable takes.

That means that you can put any value for the variable in the original equation and the equation will be true; hence there are infinite solutions.

This is an example:

1. Equation:

2. Remove the parenthesis:

3. Add like terms on the right side and transpose the variables to the left side:

4. Combine like terms on the left side:

Thus, the variable added out and the final sentence is true. Hence, this equation has infinite solutions, which you can prove substituting the variable with any value.

Answer:

Trafton will need to pay $ 900 in addition to what is in his savings account, to buy the used car he wants.

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Initial deposit = $ 7,000

Annual interest = 6.5% = 0.065 compounded continuously

Time of the investment = 4 years

Price of the used car Trafton wants to buy = $ 10,000

2. How much money will he need to pay in addition to what is in his savings account?

1. For answering the question, let's calculate how much money Trafton has in his savings account after 4 years, this way:

FV = PV * e ^ (i * t)

Where,

FV = Future value of the initial deposit after t time

PV = Initial deposit

e = Euler's number (2.7183)

i = 0.065 compounded continuously

t = 4 years

Replacing with the real values, we have:

FV = 7,000 * 2.7183^(0.065 * 4)

FV = 7,000 * 1.30 (Rounding to the nearest hundredth)

FV = $ 9,100

Now, we can elaborate how much money will Trafton need to pay in addition, as follows:

Money in addition = Price of the used car Trafton wants to buy - Future Value of the savings account after 4 years

Money in addition = 10,000 - 9,100

Money in addition = $ 900

Trafton will need to pay $ 900 in addition to what is in his savings account, to buy the used car he wants.

Answer:

$110

Step-by-step explanation:

35+25(3)

Step-by-step explanation:

First term : 8 - 0 = 8

second term: 8 - 1 = 7

third term : 8 - 2 = 6