Mathematics High School

The sum of the ages of Alice, Barbie & Cindy is 30. Alice is four times older than Cindy. Barbie is 3 years older than Alice. How old is Cindy?

A. 12
B. 21
C. 9
D. 3
E. 15​

Answers

Answer 1

D.

Explanation

because the number have 3

Answer 2

Step-by-step explanation:

A+B+C = 30

A = 4C

B = A+3

=> 4C+4C+3+C = 30

9C + 3 = 30

9C = 30-3

9C = 27

C = 3

Therefore, the age of Cindy is 3 years old

(option D)

Related Questions

Shylan's vegetable garden is florishing. She has
20 plants in her garden which are broken into
equal rows. 1/5 of the rows are cucumbers and
40% of the rows are squash. 1/2 of the
remaining rows are tomatoes. How many
pepper plants does she have?

Answers

Answer: 90millionhajk

Step-by-step explanation:

Solve the math problem

Answers

x+50+70+4x=180

combine like terms

50+70=120

subtract 120 by both sides

x+4x=60

combine like terms

5x=60

divide by 5

x=12

4x12=48

B=48

12+50=62

48+62=110

110+70=180

x=12

A=62

B=48

Given g(x)=-x+3g(x)=−x+3, find g(1)

Answers

Answer:

g(1) = 2

Step-by-step explanation:

g(x)=−x+3

g(1)=

Let x = 1

g(1) = -1+3 = 2

[tex]\sf 15=2m-9[/tex]

Answers

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

Value of m is equal to :

[tex]12[/tex]

[tex] \large \boxed{ \mathfrak{Explanation}}[/tex]

➢ 15 = 2m - 9

➢ 15 + 9 = 2m

➢ 2m = 24

➢ m = 24 ÷ 2

➢ m = 12

[tex] \mathfrak{hope \: \: it \: \: helps\;\; Rainbow ~ \: \: }[/tex]

The answer is 12 have a good day

classify the equation as having one solution no solution or infinite solution

4(9x+6)=36x-7 And the solution is x=

Answers

Answer:

[tex]\boxed{\bf {{No\:Solution}}}[/tex]

Step-by-step explanation:

[tex]\bf 4(9x+6)=36x-7[/tex]

Expand: Apply Distributive proprty:

[tex]\bf 36x+24=36x-7[/tex]

[tex]\boxed {\bf \sf {Subtract\:}24\sf {\:from\:both\:sides}}[/tex]

[tex]\bf 36x+24-24=36x-7-24[/tex]

[tex]\bf 36x=36x-31[/tex]

[tex]\boxed {\sf {Subtract\:}36x\sf {\:from\:both\:sides}}[/tex]

[tex]\bf 36x-36x=36x-31-36x[/tex]

[tex]\bf 0=-31[/tex]

Because the sides are not equal there is no Solution

Please solve this law of indices question
and don't give studip ans
i will mark as brainlisted ​

Answers

Answer:

hope you understand .............

WILL GIVE BRAINLIEST
questions 35-45 odd
please show work

Answers

Answer:

35. Domain is -∞,∞ Range is y=0.

Step-by-step explanation:

No solution.

what would be the answer to this problem [tex]\frac{7x-3}{9} \geq 8-2x[/tex]

Answers

Answer:

[tex]x\geq 3[/tex]

Step-by-step explanation:

How do i solve this table?

Answers

man im sorry because its hard to explain

Yes it’s a function

It’s a function because each input (the x) only has 1 output (the y)

An example where it wouldn’t be a function is a table like this:
1 | 4
1 | 5
2 | 7
3 | 12
4 | 19
Because 1 maps both to 4 and 5 so it’s not a function. But in your original table, it’s fine so it’s a function.

The slope and y intercept

Answers

Answer:

the y intercept is 5 because the line passes through 5 on the y axis. Now to find the slope, pick two points where the line hits directly on the corner of the grid squares. pIck 2 of those and count the squares up till you are lined up with your other point then count over and get another number. Put the number going up over the number going down like x/y and you'll have your answer. ( simplify it if you can.(-2,3) and (0,5) are a good place to start. The answer should be 2/3. Hope this helped and God bless!

10+10= hhihihhhiihihihih

Answers

Answer:

10+10=1010

Step-by-step explanation:

brainliest?

Answer:

20 lol

And hi!

H
13. Stretch Your Thinking Jenny and George combined their
allowances to buy the same present for each of their four
teachers. Jenny had $13.75. George had $2.26 less than
Jenny. How much did one present cost?

Answers

Answer: One present cost 6 dollars and 31 cents.

Step-by-step explanation:

Ok so first you subtract 2.26 from 13.75 to find out the total that George has.

That would be 11.49.

Next you add them together because they combine allowances.

So thats 25.24.

Next you divide this by 4 because they are buying the same present for their four teachers, therefore all will be the same price.

This would be 6.31

You leave the decimals because your talking about money.

Hopefully this helps. Have a wonderful day. :)

Marking me brainly really helps if you found my answer helpful!

A 5-pound bag of dog food costs $11.25. What is the unit price of the dog food in dollars per pound?

Answers

Answer:

$2.25

Step-by-step explanation:

5 lbs = $11.25

The unit price in this context means the price of a 1-pound bag of dog food so you would divide $11.25 by 5:

$11.25 ÷ 5 = $2.25

Hope this helps!

Answer:

2.25 ($) per pound

Step-by-step explanation:                                                                               11.25 /  5 = 2.25 per pound   Alternative workings we simply divide by 10  to find   11.25 / 10  = 1.125 then multiply by 2                                                      1.125 * 2  = 2.25 ($) per pound

-6 divided by 8? How do you turn it into a fraction problem?

Answers

Answer:

[tex]-\frac{3}{4}[/tex]

Step-by-step explanation:

just put the number on top and what divides it on the bottom


What is the equation of the line in slope-intercept form?
Write your answer using integers, proper fractions, and improper fractions in simplest form.

Answers

Answer:

y = 5x -1

............

Which of the following equation represents the graph?

Answers

Answer:

y= -3/5x -3

Step-by-step explanation:

PLEASE HELP IT’S DUR TMR

Answers

Answer:

10+10+10

Step-by-step explanation:

A hardware store is having a clearance sale where everything is 61% off. If the regular price of a saw is $287,
approximately how much will be taken off the regular price?

Answers

Answer:

$175.07 will be taken off

Step-by-step explanation:

287x61/100

17507/100

175.07

help a friend out?

Solve and graph the absolute value inequality: 12x +41 > 8.​

Answers

Answer:

Answer is C

The inequality is x

<−6 or x>2

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

       | 2x + 4 |  > 8        

         Case I                                 Case II

       2x + 4 > 8                            -(2x +4) > 8

            -4      -4                           -2x - 4 >  8

        2x      > 4                                   +4    +4    

           x   > 4/2                           -2x  > 12

            x > 2                               -x > 12/2

                                                   -x > 6    

                                                    x <  - 6  Multiply by -1 will change the inequality sign.  

       x >  2  and x< - 6

       x > 2    open circle at 2 and shade to the right.

       x < -6    open circle at -6 and shade to the left

Find the radius of a circle to the nearest hundredth if its circumference is 25.5 yard

Answers

4.06 yard is the the radius of a circle to the nearest hundredth if its circumference is 25.5 yard

What is 21,678 rounded to the nearest ten

Answers

Answer:

21,678 rounded to the nearest ten is 21,680

What is the graph of the function f(x) = the quantity of x squared minus 7 x plus 12, all over x minus 3 ? (1 point);

Answers

Answer:

pic is answer

Step-by-step explanation:

In the diagram, a || band b || c. Find the values of a
12x + 610
106°
The values of u are and

Answers

2x+6=106
2x=100
x=50

12x+610=106
12x= −504
x= -42

1. Sara has 8 cents. Zach has double
plus 2 of what Sara has.
How much money does Zach have?

Answers

0.8(2) = 1.6
1.6 + .2 = 1.8

I wish it would specify more on if it’s cents or dollars, but the answer should be 1.8 if you did it this way
18 cents
8x2=16+2=18
But do check with your own study as well

Please help me solve this ASAP please!

Answers

(x + 9)/2 = 3x

 

Multiply both sides by 2 since the left is divided by 2.

 

x + 9 = 6x

     9 = 5x

      x = 9/5 or 1 4/5

Expand each expression and simplify your answers as far as possible
1. 8x - 2(3 - 2x)
2. 4x + 5-3(2x - 4)

Answers

Answer:

1. 12x - 6

2. -2x + 17

Step-by-step explanation:

1.

8x - 2(3 - 2x)8x - (-2)(3) + (-2)(-2x) 8x + (-6) + 4x(8x + 4x) + (-6)12x - 6

2.

4x + 5 + (-3)(2x) + (-3)(-4) 4x + 5 - 6x + 12(4x - 6x) + (5 + 12)-2x + 17

Answer:

[tex]\boxed{\sf 12x-6}[/tex]

[tex]\boxed{\sf -2x+17}[/tex]

Step-by-step explanation:

[tex]\sf 1)\: 8x - 2(3 - 2x)[/tex]

Apply Distributive Property to multiply -2 by (3-2x):

→ [tex]\sf 8x-6+4x[/tex]

Combine like terms:

→ [tex]\sf (8x+4x)[/tex]

[tex]\sf 12x[/tex]

[tex]\boxed{\sf 12x-6}[/tex]

______________________________

[tex]\sf 2)\: 4x + 5-3(2x - 4)[/tex]

Apply Distributive property:

Multiply -3 by (2x-4):

[tex]\sf 4x+5-6x+12[/tex]

Combine like terms:

→[tex]\sf (4x+(-6x))[/tex]

[tex]\sf -2x[/tex]

→ [tex]\sf (5+12)[/tex]

[tex]\sf 17[/tex]

[tex]\boxed{\sf -2x+17}[/tex]

_____________________________

if i had 475 connolies and got left with 24 and i sold them for 2.50 how much money did i make.​

Answers

1127.50 money

475-24=451
451 times 2.5

8TH GRADE MATH PLEASE HELP!!​

Answers

Answer:

C.

Step-by-step explanation:

\sqrt{35} = 5.916079783

Its the Closest one

Answer:

C is the correct answer

[tex] \sqrt{35 } = 5.91 \\ [/tex]

guys pls help me!!!!!!

Answers

Answer: 100

Step-by-step explanation:

A line equals 180 so subtract 180-80 to get your answer.

Simplify: [5×(25)^n+1 - 25 × (5)^2n]/[5×(5)^2n+3 - (25)^n+1​]

Answers

[tex] \green{\large\underline{\sf{Solution-}}}[/tex]

Given expression is

[tex]\rm :\longmapsto\:\dfrac{5 \times {25}^{n + 1} - 25 \times {5}^{2n} }{5 \times {5}^{2n + 3} - {25}^{n + 1} } [/tex]

can be rewritten as

[tex]\rm \:  =  \: \dfrac{5 \times { {(5}^{2} )}^{n + 1} - {5}^{2} \times {5}^{2n} }{5 \times {5}^{2n + 3} - {( {5}^{2} )}^{n + 1} } [/tex]

We know,

[tex] \purple{\rm :\longmapsto\:\boxed{\tt{ {( {x}^{m} )}^{n} \: = \: {x}^{mn}}}} \\ [/tex]

And

[tex] \purple{\rm :\longmapsto\:\boxed{\tt{ \: \: {x}^{m} \times {x}^{n} = {x}^{m + n} \: }}} \\ [/tex]

So, using this identity, we

[tex]\rm \:  =  \: \dfrac{5 \times {5}^{2n + 2} - {5}^{2n + 2} }{{5}^{2n + 3 + 1} - {5}^{2n + 2} } [/tex]

[tex]\rm \:  =  \: \dfrac{{5}^{2n + 2 + 1} - {5}^{2n + 2} }{{5}^{2n + 4} - {5}^{2n + 2} } [/tex]

can be further rewritten as

[tex]\rm \:  =  \: \dfrac{{5}^{2n + 2 + 1} - {5}^{2n + 2} }{{5}^{2n + 2 + 2} - {5}^{2n + 2} } [/tex]

[tex]\rm \:  =  \: \dfrac{ {5}^{2n + 2} (5 - 1)}{ {5}^{2n + 2} ( {5}^{2} - 1)} [/tex]

[tex]\rm \:  =  \: \dfrac{4}{25 - 1} [/tex]

[tex]\rm \:  =  \: \dfrac{4}{24} [/tex]

[tex]\rm \:  =  \: \dfrac{1}{6} [/tex]

Hence,

[tex]\rm :\longmapsto\:\boxed{\tt{ \dfrac{5 \times {25}^{n + 1} - 25 \times {5}^{2n} }{5 \times {5}^{2n + 3} - {25}^{n + 1} } = \frac{1}{6} }}[/tex]

Other Questions
Write an informal letter about making an important decision 4. The fries had nearly 1,000 calories in them. Monica chose a salad instead.The most effective way to combine these sentences would be:a. The fries had nearly 1,000 calories in them, and Monica chose a salad instead.b. The fries had nearly 1,000 calories in them, but Monica chose a salad instead.c. The fries had nearly 1,000 calories in them, so Monica chose a salad instead. mr. tyler has a total of $5,000 in savings account and in a mutual fund. If he has x dollars in the savings account, how much dollars does he have in the mutusl fund? What is the equation of a line that passes through the point (8, -2) and is parallel to the line whose equation is 3x + 4y = 15? can anyone help with this Spanish pronoun assignment asap Describe the structures of Kidney pls help me i need to finish this chng minh mt tri l ngun gc ca tt c ngun nng lng the average age of teacher at school is 36 years.mr Smith age is 11/9 of the average. how old is Mr Smith? 4-8m=-8-5m what is m 1. Select the animals which are vertibratesA. TigersB. LionsC. ButterflyD. FrogsE. AntsF. SpidersG. DogsH. CatsI. EaglesJ. Snail PLEASE HELP ASAP THIS IS FOR AMERICAN SIGN LANGUAGE1. What do your eyebrows do when you speak English? (If you arent aware of your eyebrows, take some time to try keeping track of them during an ordinary day.) Does your eyebrow movement contribute to the emotional communication of your speech? A) A 180 clockwise rotation about the origin and then a reflection across the x-axis.B) A translation by the rule (x,y) (x, y-9) and then a 180 clockwise rotation about the origin.C) A reflection across the x-axis and then a translation by the rule (x,y) (x-10, y + 9).D) A 90 clockwise rotation about the origin and then a reflection across the line y = x. Can you convert this balanced equation into a nominative equation? which type is every one in this picture: pure substance or mixture? which is colder -3c or -2c guys pls help me!!!!!! Please help !! 100pts1. Which of the following best summarizes why the technological invention of microscopes was important to biology?It created public interest and support for research.It created a means of funding for cell research.It allowed for development of the cell theory.It proved that cells could form spontaneously.2. Which of the following best compares the structures found in plant cells and animal cells?Plant cells have rigid cell walls and do not contain mitochondria or ribosomes while animal cells do.Plant cells contain rough endoplasmic reticulum and a Golgi apparatus while animal cells contain smooth endoplasmic reticulum surrounded by lysosomes.Animal cells do not contain chloroplasts, cell walls, or a large central vacuole while plant cells do.Animal cells contain cell walls and a large central vacuole while plant cells contain cell membranes and many small vacuoles.3. Which equation describes what happens in photosynthesis?CO2 + O2 + H20 + energy CH2O56CO2 + 6H2O + energy C6H12O6 + 6O2C6H12O6 + 6O2 6CO2 + 6H2O + energyC6H12O6 + H20 CO2 + energy4. Early elements of the cell theory followed soon after the development of Hookes light microscope. What does this relationship suggest about the evolution of the cell theory since Hooke?Progress on the cell theory was delayed by a lack of technological progress.Scientists needed to focus less on cells and more on microscope development.Isolated scientists contributed pieces of the cell theory to form the whole.Improvements in technology are closely related to changes in the cell theory.5. Oxygen is a product of photosynthesis. The primary role of this oxygen in cellular respiration is tocombine with lactate, forming pyruvate.combine with carbon, forming CO2.yield energy in the form of ATP as it is passed down the respiratory chain.act as an acceptor for electrons and hydrogen, forming water.6. Some proteins catalyze biochemical reactions. If a genetic defect prevented a protein catalyst from being produced, which of the following do you predict would happen in the cell?The reverse reaction of the one the protein catalyzes would begin to proceed.The reaction the protein catalyzes would only occur in some places in the cell.The cell would find a different type of protein to catalyze the reaction.The reaction the protein catalyzes would proceed very slowly or not at all.7. Which statement best compares a eukaryote and a prokaryote?Eukaryotes use active transport to move substances across the cell membrane, while prokaryotes use facilitated diffusion.Eukaryotes have membrane-bound organelles, while prokaryotes have few specialized structures.Eukaryotes use flagella to move themselves through substances, while prokaryotes are not able to move.Eukaryotes have a cell wall, while prokaryotes have a cell membrane.8. What are the reactants for cellular respiration?H2O and O2Glucose and O2Glucose and CO2H2O and CO29. Which of the following best compares the membranes found in different types of cells?Animal cells have cell membranes and cell walls, but plant cells do not have cell membranes.Prokaryotes and eukaryotes both have cell membranes, but eukaryotes also have membrane-bound organelles.Animal cells have membrane-bound organelles, while plant cells carry out the functions necessary for life in the cytoplasm.Prokaryotes have only cell membranes, while eukaryotes have both cell walls and cell membranes.10. Which of the following characteristics defines a cell as a eukaryote?Having ribosomesBeing able to moveHaving a nucleusBeing able to reproduce11. Water has a much higher specific heat than most other covalent compounds. What do you predict might happen if water had a low specific heat instead?Harmful organisms living in water would reproduce at a rapid rate.Organisms that are sensitive to changes in temperature would die.Flooding would occur and animals would be forced to migrate.Plants would not have enough water to effectively carry out photosynthesis.12. Which of the following best describes a result of the polar nature of water molecules?Ionic compounds dissolve easily in water.The volume of water decreases by nearly half when it is frozen.Water molecules repel each other.Water molecules repel most other substances. Entrance to a state park costs $6 per car, plus $2 per person in the vehicle. How might you determine the entrance cost for a bus with 50 people? The expression - 250 + 16z represents a submarine that began at a depth of 250 feet below sea leveland ascended at a rate of 16 feet per minute. What was the depth of the submarine after 9 minutes?