With water from one hose, a swimming pool can be filled in 9 hours. A second, larger hose used alone can fill the pool in 2 hours. How long would it take to fill the pool if both hoses were used simultaneously?

Answer:

x = 90

c = 11

d = 11

Step-by-step explanation:

For this, we just need to use algebra to solve for x.

(x / 3) - 4 = 26 | First we add 4 to both sides

x / 3 = 30 | Then we multiply both sides by 3

x = 90.

For the others, it's the same.

-8 + 10c = 102 | Subtract -8 from both sides, or add 8

10c = 110 | Divide both sides by 10

c = 11

2.5d + 7.5 = 20 | Subtract 7.5 from both sides

2.5d = 27.5 | Divide both sides by 2.5

d = 11

Answer:

[tex]2\frac{2}{3}[/tex]

Step-by-step explanation:

we know that

Absolute value is a term which is used to indicate the distance of a point or number from the origin of a number line or coordinate system.

In this problem

we have to find the absolute value of the given number

[tex]\left \| -2\frac{2}{3} \right \|[/tex]

that means we have to find the distance of [tex]\left \| -2\frac{2}{3} \right \|[/tex]  from the origin of a number line.

Distance of [tex]-2\frac{2}{3}[/tex] from the origin is [tex]2\frac{2}{3}[/tex] .

Remember that the distance cannot be a negative number.

Therefore, the absolute value of [tex]\left \| -2\frac{2}{3} \right \|[/tex] is [tex]2\frac{2}{3}[/tex]

see the attached figure to better understand the problem

Answer:

2_2/3  

Step-by-step explanation:

Answer:

10/7

Step-by-step explanation:

Step 1: Subtract 12x from both sides.

−2x+5−12x=12x−15−12x

−14x+5=−15

Step 2: Subtract 5 from both sides.

−14x+5−5=−15−5

−14x=−20

Step 3: Divide both sides by -14.

−14x/14=−20/14

x=10/7

You get 10 over 7 because you simplify 20 over 14 by dividing them by 2 which would give you 10/7.

Answer:

4.9 x 10^-4 is the scientific notation

Move the decimal 4 places from left to right

Answer:

[tex]\displaystyle 4,9 \times 10^{-4}[/tex]

Step-by-step explanation:

[tex]\displaystyle 0,00049 = 4,9 \times 10^{-4}[/tex]

You move the decimal mark four times to the left.

I am joyous to assist you anytime.

Answer:

6.25 km an hour

please mark brainliest

Step-by-step explanation:

Answer:

Average velocity = 6.25 km/h

Step-by-step explanation:

Given  : A horse began running due east and covered 25 km in 4.0 hr.

To find :  What is the average velocity of the horse.

Solution : We have given

Displacement  = 25 km

Time = 4 hr.

Velocity = [tex]\frac{Total\ displacement}{time}[/tex].

Velocity = [tex]\frac{25}{4}[/tex].

Average velocity = 6.25 km/h

Therefore, Average velocity = 6.25 km/h

Answer:

the total amount spent was$2.34 cents

Answer:

He spent $ 2.34 in all.

Step-by-step explanation:

Given,

The amount spent on the bottle of paint = $ 1.89,

While, the amount spent on the brush = $ 0.45,

Hence, the total amount spent = amount spent on paint + amount spent on brush

[tex]= 1.89 + 0.45[/tex]

[tex]= \$ 2.34[/tex]

i.e. Lawrence spent total $ 2.34 in both.

Answer:

13, 12, and 11. Im on connexus and when i submitted it said those are the correct answers. Hope it helps! :)

Step-by-step explanation:

Answer:

1.65 X 10^-3 (i don't know if your teacher wants you to also add the unit at the end, but if your teacher does, then just add metric ton at the end. :-) )

Step-by-step explanation:

We want to bring the decimal point to the right of the first number, so you move the decimal point 3 times to the right, which would give you 1.65 metric ton.

So you should know that moving a decimal point to the right would make the power negative, and moving the decimal point to the left would make the power positive.

In this situation, the power would be negative, and a negative three, because you moved the decimal point 3 times to the right.

Hope this helped :-) <3

Answer:

Step-by-step explanation:

the  equation line passes through(-3,0)and (0,3)  is : y=ax+b

a is the slope   a = (3-0)/(0+3) = 1

so : y= x +b  calculate b  line passes through(-3,0)and (0,3)

x=0   y=3  : 3 = 0+b       so  b= 3

this equation is : y= x+3

Rewrite the fractions with common denominators and then answer:

A:

13/14 > 25/28

26/28 > 25/28    

This is True

B) 21/45 < 20/45  False

C) 10/12 > 11/12

False

D) 20/25 < 8/25

False

The true statement is A.

Answer:

Part a) The estimate amount of medicine is 30.0 grams

Part b) The actual amount of medicine is 29.925 g. The difference between the  estimate and the actual amount, is 0.075 g

Part c) 5.985 grams

Part d) 6 grams

Step-by-step explanation:

The complete question is

Dr. Mann mixed 10.357 g of chemical A, 12.062 g of chemical B, and 7.506 g of chemical C to make 5  doses of medicine.

a. About how much medicine did he make in grams? Estimate the amount of each chemical by  rounding to the nearest tenth of a gram before finding the sum. Show all your thinking.

b. Find the actual amount of medicine mixed by Dr. Mann. What is the difference between your  estimate and the actual amount?

c. How many grams are in one dose of medicine? Explain your strategy for solving this problem.

d. Round the weight of one dose to the nearest gram

Part a) round  to the nearest tenth of a gram first

Chemical A

10.357 g -----> 10.4 g

Chemical B

12.062 g -----> 12.1 g

Chemical C

7.506 g -----> 7.5 g

To find out the estimate amount of medicine sum the three values

10.4+12.1+7.1=30.0 g

therefore

The estimate amount of medicine is 30.0 grams

Part b)

The actual amount of medicine is

10.357+12.052+7.506=29.925 g

To find out the difference between your  estimate and the actual amount, subtract the actual amount from the estimate

30.0-29.925=0.075 g

Part c) To find out how many grams are in one dose of medicine, divide the actual amount of medicine by five

29.925 g/5=5.985 g

Part d) Round the weight of one dose to the nearest gram

we have

5.985 g ------> 6 g

Answer: The answers C

Step-by-step explanation: Use Desmos to find it

Answer:

Option C.

Step-by-step explanation:

If a line passes through two points [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex], then the equation of line is

[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]

From the given graph it is clear that the related line passes thorough the points (0,2.5) and (2,-1.5).

The equation of related line is

[tex]y-2.5=\frac{-1.5-2.5}{2-0}(x-0)[/tex]

[tex]y-2.5=\frac{-4}{2}(x)[/tex]

[tex]y-2.5=-2x[/tex]

Add 2.5 on both sides.

[tex]y-2.5+2.5=-2x+2.5[/tex]

[tex]y=-2x+2.5[/tex]

Th sign of inequality is either ≤ or ≥ because the related line is a solid line. It means the points on the line are included in the solution set.

Let the required inequality is

[tex]y\geq -2x+2.5[/tex]

(1,1) is included in the shaded region. So, the above inequality is true for (1,1).

[tex]1\geq -2(1)+2.5[/tex]

[tex]1\geq 0.5[/tex]

The assumed inequality is true for (1,1). So, the required inequality isn [tex]y\geq -2x+2.5[/tex].

Therefore, the correct option is C.

The exact value of [tex]\( L \) is \(-\frac{44}{3}\).[/tex]

To find [tex]\( x \)[/tex], we need to use the fact that [tex]\( LK = MK \)[/tex] and apply the given values and equations.

1. Set up the equation for [tex]\( LK \)[/tex] and [tex]\( MK \):[/tex]

Given:

2. Substitute the given expressions:

3. Set up the equation [tex]\( LK = MK \)[/tex]

4. Solve for [tex]\( x \):[/tex]

5. Find [tex]\( L \):[/tex]

Convert 10 to a fraction:

Thus, [tex]\( L \)[/tex] would be [tex]\(-\frac{44}{3}\)[/tex], assuming [tex]\( L \)[/tex] represents the value of [tex]\( LK \).[/tex]

The complete question is:

If LK = MK, LK = 7x-10, KN = x + 3, MN = 9x - 11. and KJ = 28, find L.

Answer:

4:5

Step-by-step explanation:

You can divide both numbers by 12, therefore simplifying the numbers to the lowest they can be

Answer:

Ratio of table to chair : [tex]\frac{4}{5}[/tex].

Step-by-step explanation:

Given : furniture store sells 48 tables for every 60 chairs in a given week.

To find : what is the unit rate of tables to chairs.

Solution: We have given

Table = 48 .

Chair = 60 .

Ratio of table to chair : [tex]\frac{48}{60}[/tex].

On dividing both number by 4

Ratio of table to chair : [tex]\frac{12}{15}[/tex].

On dividing both number by 3

Ratio of table to chair : [tex]\frac{4}{5}[/tex].

Therefore, Ratio of table to chair : [tex]\frac{4}{5}[/tex].

Answer:

A credit score is a numerical expression based on a level analysis of a person's credit files, to represent the creditworthiness of an individual. A credit score is primarily based on a credit report, information typically sourced from credit bureaus.

Answer:

a number assigned to a person that indicates to lenders their capacity to repay a loan.

Step-by-step explanation:

Answer:

The price of the almonds is $0.38 per pound.

Step-by-step explanation:

Gabby measures out 55 pounds of almonds at the grocery store bulk section.

At checkout the total cost is $20.90.

So, the price per pound will be = [tex]\frac{20.90}{55}[/tex]

= $0.38 per pound.

Therefore, the price of the almonds is $0.38 per pound.

Answer:

Complete each of the statements below.

When work is done on a system by its surroundings, the sign of w is                           [ Select ]                       ["positive", "negative"]         .

When work is done by a system on its surroundings, the sign of w is                           [ Select ]                       ["negative", "positive"]         .

When q has a negative sign, we can say that heat is transferred                           [ Select ]                       ["from", "into"]         the system                            [ Select ]                       ["from", "into"]         its surroundings.

If ∆U for a system is 0 and w is negative, then q must be                           [ Select ]                       ["positive", "negative"]         .

Step-by-step explanation:

1. Expression 1: [tex]\((3x^2 - 6x + 11) \cdot (10x^2 - 4x + 6)\)[/tex]:[tex]\[30x^4 - 72x^3 + 34x^2 - 44x + 66\][/tex]

2. Expression 2: [tex]\((-3x^2 - 5x + 3) \cdot (-10x^2 - 7x + c)\)[/tex]:[tex]\(30x^4 + 71x^3 + 5x^2 - 21x + 3c\).[/tex]

3. Expression 3: [tex]\((12x^2 + 6x - 5) \cdot (5x^2 + 8x - 12)\)[/tex]: [tex]\(60x^4 + 126x^3 + 53x^2 + 40x - 60\).[/tex]

the expressions step by step:

1. Expression 1: [tex]\((3x^2 - 6x + 11) \cdot (10x^2 - 4x + 6)\)[/tex]

  To multiply these two expressions, we'll use the distributive property (also known as the FOIL method). Multiply each term in the first expression by each term in the second expression and then combine like terms.

  - Multiply the first terms: [tex]\(3x^2 \cdot 10x^2 = 30x^4\)[/tex]

  - Multiply the outer terms: [tex]\(3x^2 \cdot (-4x) = -12x^3\)[/tex]

  - Multiply the inner terms: [tex]\((-6x) \cdot 10x^2 = -60x^3\)[/tex]

  - Multiply the last terms: [tex]\((-6x) \cdot (-4x) = 24x^[/tex]2\)

  Now add up all the results:

  [tex]\[30x^4 - 12x^3 - 60x^3 + 24x^2 + 11 \cdot 10x^2 - 11 \cdot 4x + 11 \cdot 6\][/tex]

  Combine like terms:

[tex]\[30x^4 - 72x^3 + 34x^2 - 44x + 66\][/tex]

So, the equivalent expression is:[tex]\(30x^4 - 72x^3 + 34x^2 - 44x + 66\)[/tex].

2. Expression 2: [tex]\((-3x^2 - 5x + 3) \cdot (-10x^2 - 7x + c)\)[/tex]

  Follow the same steps as above to multiply the expressions:

  - Multiply the first terms: [tex]\((-3x^2) \cdot (-10x^2) = 30x^4\)[/tex]

  - Multiply the outer terms: [tex]\((-3x^2) \cdot (-7x) = 21x^3\)[/tex]

  - Multiply the inner terms: [tex]\((-5x) \cdot (-10x^2) = 50x^3\)[/tex]

  - Multiply the last terms: [tex]\((-5x) \cdot (-7x) = 35x^2\)[/tex]

  Combine the results:

[tex]\[30x^4 + 21x^3 + 50x^3 + 35x^2 + 3 \cdot (-10x^2) + 3 \cdot (-7x) + 3c\][/tex]

  Combine like terms:

[tex]\[30x^4 + 71x^3 + 35x^2 - 30x^2 - 21x + 3c\][/tex]

  Simplify further:

[tex]\[30x^4 + 71x^3 + 5x^2 - 21x + 3c\][/tex]

  So, the equivalent expression is: [tex]\(30x^4 + 71x^3 + 5x^2 - 21x + 3c\).[/tex]

3. Expression 3: [tex]\((12x^2 + 6x - 5) \cdot (5x^2 + 8x - 12)\)[/tex]

  Apply the same process:

  - Multiply the first terms:[tex]\(12x^2 \cdot 5x^2 = 60x^4\)[/tex]

  - Multiply the outer terms: [tex]\(12x^2 \cdot 8x = 96x^3\)[/tex]

  - Multiply the inner terms:[tex]\(6x \cdot 5x^2 = 30x^3\)[/tex]

  - Multiply the last terms:[tex]\(6x \cdot 8x = 48x^2\)[/tex]

  Combine the results:

  [tex]\[60x^4 + 96x^3 + 30x^3 + 48x^2 + 5 \cdot 5x^2 + 5 \cdot 8x - 5 \cdot 12\][/tex]

  Combine like terms:

  [tex]\[60x^4 + 126x^3 + 53x^2 + 40x - 60\][/tex]

  The equivalent expression is: [tex]\(60x^4 + 126x^3 + 53x^2 + 40x - 60\).[/tex]

Answer: To find out the unlabeled one on the inside subtract 180- 123, then you Get 57. Now do 180 = 57 + x +

92. Add up the whole numbers to get 180 = 149 + x now subtract 149 from 180, to get 31 and it equals x TADA

Step-by-step explanation:

Answer: 0.1

Step-by-step explanation: you only need to add zero to the first value,

for example if you have 1/10, you add zero, getting the next equation

10/10 if you add a zero to value you can add a zero to the result getting the following result

10/10=0. in this point both values are divisible

and 10 between 10 is equal to 1

as you finish add zeros you can add a point and after the 1 getting this result

1/10 = 0.1

Answer:

Step-by-step explanation:

The given expression is

[tex]\frac{x^{3}-1}{x^{3}+x^{2}+x}[/tex]

This expression is rational, which means the denominator must be different to zero, otherwise, the function will be undefined. So, let's find if there are values that make the denominator zero.

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

So, if we evaluate the expression with [tex]x=0[/tex], we would have

[tex]\frac{x^{3}-1}{x(x^{2}+x+1)}=\frac{0^{3}-1}{0(0^{2}+0+1)}=\frac{-1}{0}[/tex]

As you can observe, there must be one exclusion, because it makes the expression undefined.

Therefore, the answer is true.

Answer with Step-by-step explanation:

a. The difference between 8 forty-sevens and 7 forty-sevens

Let ⊕ repesents forty- sevens.

So, Model can be represented by

8⊕ - 7⊕

=⊕⊕⊕⊕⊕⊕⊕⊕-⊕⊕⊕⊕⊕⊕⊕

=⊕

Mathematically,

let x represents forty-sevens.

So, it becomes

[tex]8x-7x=x[/tex]

b. 6 times the sum of 12 and 8.

Mathematically, it is expressed as

[tex]6\times (12+8)\\\\=6\times 20\\\\=120[/tex]

Let 12 be written as 4×3

and 8 be written as 4×2

Let ⊕ represents 4 i.e. fours.

so, there are sum of 2 fours and 3 fours.

So, it becomes,

6×(⊕⊕+⊕⊕⊕)

=6×(⊕⊕⊕⊕⊕)

=⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕⊕

=4×30

=120

Answer:

thanks

Step-by-step explanation:

The cofunction of cos is sin(90-x)

90 degrees is equal to PI/2

The cofunction becomes sin(PI/2 - 2PI/9)

Rewrite both fractions to have a common denominator:

PI/2 = 9PI/18

2PI/9 = 4PI/18

Now you have sin(9PI/18 - 4PI/18)

Simplify:

Sin(5PI/18)

The cofunction of cos 2pi/9 is sin(pi/2 - 2pi/9), which is a basic concept in trigonometry.

The student is asking about the cofunction of

cos 2pi/9

. In trigonometry, the cofunction of a function is basically the complementary function of 90 degrees minus the original function. In this case, the cofunction of cos is sin, so to find the cofunction of cos 2pi/9, you need to find sin(90 - 2pi/9). However, since we are dealing with radians here, rather than degrees, we will be using pi/2 instead of 90 degrees. Therefore, the cofunction of cos 2pi/9 is

sin(pi/2 - 2pi/9)

.

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Answer:

45 less than twice a number is 5 times that number

Step-by-step explanation:

n = 15

Use one of the four fundamental arithmetic operations to add, subtract, multiply, or divide two or more integers. For challenging computations, we use the PEMDAS approach.

Given five times n is equals to 45 less than twice the number of n.

hence,

5 * n = 2* n + 45

3* n = 45

n = 15

Therefore the value of the n in the given problem is 15.

Learn more about Arithmetic operations here:

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Final answer:

The constant of proportionality for dollars earned per hour worked is 6.25, and the constant of proportionality for hours worked per dollar earned is 0.16.

Explanation:

To find the constant of proportionality for dollars earned per hour worked, we can use the formula y = kx, where y is the amount earned and x is the number of hours worked. Given that Lucy earned $25 for 4 hours of work, we can substitute these values into the equation:

25 = k * 4

Solving for k, we divide 25 by 4:

k = 25 / 4 = 6.25

Therefore, the constant of proportionality for dollars earned per hour worked is 6.25.

To find the constant of proportionality for hours worked per dollar earned, we can rearrange the equation to x = my, where x is the number of hours worked and y is the amount earned. Substituting the values, we get:

4 = m * 25

Solving for m, we divide 4 by 25:

m = 4 / 25 = 0.16

Therefore, the constant of proportionality for hours worked per dollar earned is 0.16.

Answer:

$12.80

Step-by-step explanation:

Sara bought 4 pounds of coffee.

Each pound (lb) costs $3.20

To find the total cost, multiply the cost per pound ($3.20) with the amount of pounds Sara is going to buy (4):

4 x 3.20 = $12.80

$12.80 would be the total cost before tax.

~

Answer:

12.8

Step-by-step explanation:

Its proportions: 1 pound equals 3.20, 4 poundes equals x.

3.20 (cost per pound) x 4 (how many pounds) = 12.8 (answer)

Triangle MNO was dilated (increased) and then rotated to create triangle YHO.

Transformation is the movement of a point from its initial location to a new location. Types of transformation are rotation, translation, reflection and dilation.

Dilation is the increase or decrease in the size of a figure to create an image.

Triangle MNO was dilated (increased) and then rotated to create triangle YHO.

Find out more on transformation at: https://brainly.com/question/1548871

The answer is "453.592 grams." One pound does indeed equal 453.592 in grams.

Hope this helps.

Answer:

C

Step-by-step explanation:

Answer:  The correct option is

(A) [tex]\dfrac{1}{9}.[/tex]

Step-by-step explanation:  Given that y is directly proportional to x, and y = 6 when x = 54.

We are to find the constant of proportionality.

According to the given information, we can write that

[tex]y\propto x\\\\\Rightarrow y=kx~~~~~~~~~~~[\textup{where k is the constant of proportionality}]\\\\\Rightarrow k=\dfrac{y}{x}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

When y = 6 and x = 54, then from equation (i), we get

[tex]\dfrac{6}{54}=k\\\\\Rightarrow k=\dfrac{1}{9}.[/tex]

Thus, the required value of the constant of proportionality is [tex]\dfrac{1}{9}.[/tex]

Option (A) is CORRECT.