Write a system of equations and solve. A chemist wants to make a 10% solution of fertilizer. How much water and how much of a 30% solution should the chemist mix to get 30 L of a 10% solution?

Answer: Delila is correct about this determination.

Step-by-step explanation: The rule for multiplying two negatives is that a negative and a negative always equal a positive. Therefore, multiplying two negatives will give a positive. However, we still have to multiply that positive by another negative to get our answer. Another multiplication rule states a negative and a positive always equals a negative. Let's set up an example with the numbers -7, -8, and -4:

Using the first multiplication rule mentioned above, let's multiply:

-8 x -7 = 56

Using the second multiplication rule mentioned above, we can finish the equation and get our answer:

56 x (-4) = -224

-7 x -8 x -4 = -224.

Final answer: Delila is correct. Multiplying three negatives will result in a negative solution.

Answer:

28°

Step-by-step explanation:

63 -35 = 28

The solution of the equations −6x − 6y = −42 and −x + 2y = 8 will be (2, 5).

The distribution of weights to the variables involved that establishes the equilibrium in the calculation is referred to as a result.

The equations are given below.

−6x − 6y = −42      ...1

−x + 2y = 8            ...2

From equation 2, we have

x = 2y − 8

Put the value of x in equation 1, then we have

−6(2y − 8) − 6y = −42

−12y + 48 − 6y = − 42

18y = 90

y = 5

Then the value of x will be

x = 2(5) − 8

x = 10 − 8

x = 2

The solution of the equations −6x − 6y = −42 and −x + 2y = 8 will be (2, 5).

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Answer: c = 12

Step-by-step explanation: r is 2 since in the circle it shows the length from the center to the arc. now multiply 2(3)(2) and you will end up with 12.

Answer:

Circumference = 12

Step-by-step explanation:

C=2πr

where,

➟ C = 2πr

Insert values

➟ C = (2)(3)(2)

➟ C = (6)(2)

➟ C = 12

Solving a quadratic equation, the youngest age for which the average income of the lawyer is of $250,000 is of 26 years.

A quadratic function is given according to the following rule:

y = ax² + bx + c

[tex]\Delta = b^2 - 4ac[/tex]

The solutions are:

[tex]x_1 = \frac{-b + \sqrt{\Delta}}{2a}[/tex]

[tex]x_2 = \frac{-b - \sqrt{\Delta}}{2a}[/tex]

In which:

[tex]\Delta = b^2 - 4ac[/tex]

For this problem, the equation that models the income as function of age is given by:

I(x) = -425x² + 45500x - 650000.

The income is of 250,000 when I(x) = 250000, hence:

250000 = -425x² + 45500x - 650000.

425x² - 45500x + 900000 = 0.

Hence the coefficients are a = 425, b = -45500 and c = 900000, then:

The youngest age for which the average income of the lawyer is of $250,000 is of 26 years. (the oldest is of 81 years).

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Answer:

x> -2

Step-by-step explanation:

The combination of hours that Keitaro can walk and run in a month to reach his goal will be A. 2 hours walking; 12 hours running

From the information, Keitaro walks at a pace of 3 miles per hour and runs at a pace of 6 miles per hour. Each month, he wants to complete at least 36 miles but not more than 90 miles.

The equation is

3w + 6r ≥ 36

3w + 6r ≤ 90

The combination of hours that Keitaro can walk and run in a month to reach his goal will be 2 hours walking, and 12 hours running.

This will be:

3w + 6r ≤ 90

3(2) + 6(12)

6 + 72 = 78

Therefore, 78 is less than 90.

The correct option is A.

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The angle, its complement, and its supplement are 36, 54 and 144 degrees respectively

The sum of complementary angles s 90 degrees while that of supplementary angles is 180 degrees.

Let the complement of an angle be 90 -x and its supplement be 180 -x

If three times the measure of a supplement of an angle is eight times the measure of a complement of the angle, then;

3(180-x) = 8(90-x)

Expand

540-3x = 730 - 8x

540-720 = -8x + 3x

180 = 5x

x = 180/5

x = 36 degrees

Complement  = 90 - 36 = 54degrees

Supplement = 180 - 36 = 144 degrees

Hence the angle, its complement, and its supplement are 36, 54 and 144 degrees respectively

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There are 152 boys who are present in the class with ratio 19:6.

A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0.

Given:

ratio = 19:6

let the common ratio be x

number of boys = 19 x

number of girls = 6x

Also,

number of boys = number of girls + 104

19x = 6x +104

13 x = 104

x= 8

Hence, the number of boys are 19x= 19*8 = 152 boys.

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Answer: 17. The fower will last 85 days

18. She ran at a constant pace of around 12.94mph (if her time was 14 minutes and 24.6 (14.14m) ) or 12.7mph (if her time was 14 minutes 41 seconds) (the .41 confused me so I did both possible solutions)

Hope this helped c:

Answer:

V = 1 (Please mark the answer as brainliest)

Step-by-step explanation:

8(5 - 6v) = -7 - v

40 - 48v = -7 - v

40 = -7 + 47v

47 = 47v

1 = v

Answer:

v = 1

Step-by-step explanation:

Let's solve the problem,

→ 8(5 - 6v) = -7 - v

→ 40 - 48v = -7 - v

→ 40 + 7 = -v + 48v

→ 47v = 47

→ v = 47/47

→ [ v = 1 ]

Hence, the value of v is 1.

2

Step-by-step explanation:

The total volume of the solid = 1,035,000 cm³

Volume of a Pyramid = 1/3(length)(width)(height).

Volume of a cuboid = (length)(width)(height).

Volume of the Pyramid = 1/3(length)(width)(height)

Volume of the Pyramid = 1/3(90)(50)(240 - 225)

Volume of the Pyramid = 1/3(90)(50)(15)

Volume of the Pyramid = 22,500 cm³

Volume of the cuboid = (length)(width)(height)

Volume of the cuboid = (90)(50)(225)

Volume of the cuboid = 1,012,500 cm³

The total volume of the solid = 22,500 + 1,012,500

The total volume of the solid = 1,035,000 cm³

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The equivalent expression for the expression consisting of mixed fraction 2 { 5 5/8 } + 3 { 9 13/16 } is 651/16.

According to the given question.

We have an expression consisting of mixed fractions.

2 { 5 5/8 } + 3 { 9 13/16 }

Since, we convert the mixed fraction into improper fraction by

Step 1: Multiply the denominator with the whole number.

Step 2: Add the numerator to the product obtained from step 1.

Step 3: Write the mixed fraction with the sum obtained from step 2 as the numerator and the denominator of the original fractional part of the mixed fraction.

Therefore, the equivalent expression for the expression 2 { 5 5/8 } + 3 { 9 13/16 } is given by

2{45/8} +3{157/16}

= 90/8 + 471/16

=  [180 + 471]/16

= 651/16

Hence, the equivalent expression for the expression consisting of mixed fraction 2 { 5 5/8 } + 3 { 9 13/16 } is 651/16.

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Answer:

y = x + 9

Step-by-step explanation:

y = mx + b  Use the x and y from the point (-5,4) and the slope to find b.  They you can write the equation.  An ordered pair is in the form of (x,y)

y = mx + b

4 = (1)(-5) + b

4 = -5 + b   Add 5 to both sides of the equation

9 = b

Now write the equation

y = x + 9

Answer:

The equation for the number of people is 25.50x + 6.25 = 235.75 and the number of people who can go to the amusement park are 9.

Step-by-step explanation:

We have,

Spend on parking and admission = $235.75  

Spend on parking  = $6.25

Cost of ticket per person = $25.50

Let number of number of people = x

Now,

According to the question;

25.50x + 6.25 = 235.75

So, this the equation for number of number of people.

Now,

25.50x + 6.25 = 235.75

25.50x = 229.50

x = 9

So, number of number of people is 9, which we find out using the above mentioned equation.

Hence, we can say that the equation for the number of people is 25.50x + 6.25 = 235.75 and the number of people who can go to the amusement park are 9.

The number of people who can go to the amusement park is 9 they have $235.75 to spend on parking and admission. Parking is $6.25.

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

It is given that:

A group of friends wants to go to the amusement park. They have $235.75 to spend on parking and admission.

Parking is $6.25, and tickets cost $25.50 per person, including tax.

Let x be the number of people

6.25 + 25.50x = 235.75

25.50x = 235.75 - 6.25

25.50x = 229.5

x = 9

Thus, the number of people who can go to the amusement park is 9 they have $235.75 to spend on parking and admission. Parking is $6.25.

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Subsets of the specified set equal 16.

The set's appropriate subset is equal to 15.

A set is the collection of specific, distinct items from our perception (Anschauung) and from our thought, which are referred to as the set's elements. A set's elements or members can be anything, including numbers, people, alphabet letters, other sets, and so on. Sets are typically indicated.

given data:- { 5​, 7​, 17​, 15 ​}

this set have 4 elements:

We are aware that the number of subsets of a set with n elements is represented by 2^n

where n denotes the set's element count.

as a result, the given set's subsets = 2^4

= 16

Because the original set itself is subset of itself, it is not a legitimate subset.

Consequently, a proper subset of a set:- 2^n - 1

= 2^4 - 1

= 16 -1

 = 15

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Answer:

7. I attached my answer ... have a nice day

Answer:

22.7

This is becuase 6 is closer too 7. Thus we would round too 7.

Answer:

[tex] \sf \large \frac {1}{8}b²c[/tex]

Step-by-step explanation:

3/4ab/6/abc

= 1/8ab²c/a

= 1/8b²c

Euclidean geometry differs from spherical geometry because Euclidean geometry is used to set points by the use of plane.

Euclidean geometry is the study of geometrical shapes (plane and solid) and figures based on different axioms and theorems.

Now since Spherical geometry is the geometry of the two-dimensional surface of a sphere. In this context the word "sphere" refers only to the 2-dimensional surface and other terms like "ball" or "solid sphere" are used for the surface together with its 3-dimensional interior.

Euclidean geometry differs from spherical geometry because Euclidean Geometry are known to make use of a plane to be able to set points and lines, but Spherical Geometry are known to make use of spheres to set up points and great circles.

Thus, Euclidean geometry differs from spherical geometry because Euclidean geometry is used to set points by the use of plane.

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The correct answer for  0.504 ÷ 8 is option B which is 0.063

0.504 / 8 is solved by removing the decimals first and then the division as required.

0.504 / 8

= 504/1000 / 8

= 504 / 8000

= ( 504 / 8 ) * ( 1 / 1000 )

= 63 *  ( 1 / 1000 )

= 0.063

These are class of numbers that can be represented as fractions inform of two integers. Such numbers while in fractions, the denominator should not be zero and while decimal do not need to approximations to terminate them.

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answer:

1.

[tex]9y - 1[/tex]

2.

[tex] { \times }^{3} - { \times }^{2} + \times [/tex]

3.

[tex] - 3 {a}^{2} + a + 2[/tex]

4.

[tex] - { \times }^{2} [/tex]

5.

[tex] - 4 { \times }^{5} + 16 { \times }^{3} - 20 { \times }^{2} [/tex]

6.

[tex]8 { \times }^{3} + 6 { \times }^{2} - 32x + 15[/tex]

7.

[tex] { \times }^{2} - \times - 20[/tex]

8.

[tex]24 { \times }^{2} - 6 \times + 1[/tex]

9.

[tex] { \times }^{2} - 6 \times + 5[/tex]

10.

[tex]10 { \times }^{5} + 3 { \times }^{3} - 2 \times [/tex]

5. The relationship is Linear and the equation is 500 × 1.1 + 500 = 1050.

6. The relation ship is Linear and the equation is 6 × 2/3 = 4

Given,

5. The population of a town = 500

    The growth of population expected by the city planner = 1.1

    That is, 500 × 1.1 + 500 = 1050

This is a Linear equation.

6. The distance from where the basketball fall down = 6 feet

    Basket ball bounce back its previous height = 2/3

That is,  6 × 2/3 = 4

This is a Linear equation.

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The combined cost of one pound of pork and one pound of beef is $ 15.5.

The total cost is equal to the sum of the products of unit price and quantity of an article. In this problem we find the sum of the quantities of two products (pork roast, beef roast), whose expression can be described below:

67.50 = (3.25) · (x - 0.50) + (5.5) · x

Where x is the unit cost of the beef roast.

Now we proceed to solve the equation for x:

67.50 = 3.25 · x - 1.625 + 5.5 · x

69.125 = 8.75 · x

x = 7.9

A pound of beef roast costs $ 7.9 and a pound of pork roast costs $ 7.4. Then, the combined cost of one pound of prok and one pound of beef is:

C = 1 · 7.9 + 1 · 7.4

C = 15.5

The combined cost of one pound of pork and one pound of beef is $ 15.5.

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An equation to find the number of treats t that was in the original package is t=10+4(15).

First, you set aside the 10 and that is the start of your equation.

We need to find an equation to find the number of treats t that was in the original package.

In mathematics, an equation is a formula that expresses the equality of two expressions, by connecting them with the equals sign =.

Now, t=10+4(15)

⇒t=10+60

⇒t=70

Therefore,  an equation to find the number of treats t that was in the original package is t=10+4(15).

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Answer:

116 g

Step-by-step explanation:

Zn:Cu = 4:19

so 551 x (4/19) = 116