Mathematics High School

Determine if the following ratios form proportions.

1.) 1 to 3 and 7 to 21

2.) 3 to 4 and 24 to 18

3.)1:5 and 6:30

for brainiest:)

Answers

Answer 1

Answer:

1. Proportional

2. Not proportional

3. Proportional

Step-by-step explanation:

We have three questions with 2 ratios and are asked if they are proportional or not.

To define proportionality, basically its if the two ratios equal the same value when put in a certain way.

And that way is :

[tex]\frac{x}{y} =\frac{x}{y}[/tex]

You will substitute the numbers with the letters, in which you will cross multiply :

[tex]\frac{x * y}{x*y}[/tex]

So subtitute :

1.

[tex]\frac{1}{3} *\frac{7}{21}[/tex]

[tex]\frac{1*21}{7*3}[/tex]

[tex]21=21[/tex]

Therefore 1. is proportional.

2.

[tex]\frac{3}{4} *\frac{24}{18}[/tex]

[tex]\frac{4*24}{3*18}[/tex]

[tex]\frac{96}{54}[/tex]

96 = 54

Therefore 2. is not proportional.

3.

[tex]\frac{1}{5} *\frac{6}{30}[/tex]

[tex]\frac{1*30}{5*6}[/tex]

[tex]\frac{30}{30}[/tex]

30 = 30

Therefore 3. is proportional.

Related Questions

Plzzz help I will give you 25 points

Answers

Pretty sure the answer is 77

PLS HELP ME ! IM GIVING BRAINLIEST

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Answer: 15 feet

Step-by-step explanation:

I divided 20 by 12 on the calculator and I got a repeating decimal (1.6666) Then, not clearing the calculator, I multiplied that by 9 and if you followed the steps, you should get 15.

Reena bought a mobile phone for 16,240 that included a GST of 12%. Find the price of the mobile phone before the GST was added.​

Person who answers will be marked brainliest

Answers

Answer: 14500

Step-by-step explanation:

Let the price of the mobile phone before the GST was added be represented by x.

Therefore,

x + (12% × x) = 16240

x + 0.12x = 16240

1.12x = 16240

x = 16240/1.12

x = 14500

The price of the mobile phone before the GST was added was 14500

True or False. The cross section of a Sphere is an ellipse.
a. True
b. False​

Answers

Answer:

False! all cross sections of spheres are circles!

Step-by-step explanation:


Find the slope of the line that passes through the pair of points
(-13,7) and (1, -14)

Answers

Answer:

m= -3/2

Step-by-step explanation:

I hope this helps

Need Help on Algebra 2 Question To Finish My Unit Exam (10.12)

Answers

Answer:

3rd option

Step-by-step explanation:

Find the length of AB.
АE:14
AD:12
AB:
BC:18

Answers

Answer:

Whre is the question I don't get it

Write an equation of a like that passes through the points (9,5) and (6,7)

Answers

Answer:

y=-2/3x+11

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(7-5)/(6-9)

m=2/-3

m=-2/3

y-y1=m(x-x1)

y-5=-2/3(x-9)

y=-2/3x+18/3+5

y=-2/3x+6+5

y=-2/3x+11

Which of the following are solutions to the equation below?
Check all that apply
x2 + 4x + 4 = 12

Answers

Answer:

         C.  2√3 - 2

Step-by-step explanation:

[tex]x^2 + 4x + 4 = 12\\\\x^2+2\cdot x\cdot2+2^2=12\\\\(x+2)^2=12\\\\x+2=-\sqrt{12}\quad\vee\quad x+2=\sqrt{12}\\\\x=-2\sqrt{3}-2\quad\vee\quad x=2\sqrt3-2[/tex]

Solve the quadratic equation numerically (using tables of x- and y- values).
x squared + 2 x + 1 = 0

Answers

Answer:

x=-1

Step-by-step explanation:

Step 1: Factor

[tex]x^{2} +2x+1[/tex] => [tex](x+1)(x+1)[/tex]

Step 2: Solve for x.

[tex]x+1=0[/tex]

   [tex]-1[/tex]     [tex]-1[/tex]

-----------------

[tex]x=-1[/tex]

5. A cell phone company charges $50 connection fee plus $20 per line. Jake must spend under $140 on his
family's cell phone bill. How many cell phones can his family have? Write the linear inequality that models this
situation then solve the problem. Please show your math work
I WILL GIVE BRAINLIEST!!

Answers

Answer:

4 lines

Step-by-step explanation:

50+20*lines < 140

20*lines < 90

lines < 4.5

what will happend if agricultural land decrease​

Answers

can i get the crown please ↑ ↑ ↑ ↑ ↑ ↑

they have pictures thats

the answer

Complete the equation. Answer as a fraction in its simplest form.

9xy * (2/3x)^3 = ( / )x^4 y

Answers

Step by Step Solution

STEP

1:

           2

Simplify   —

           3

Equation at the end of step

1:

         2

 9xy • ((— • x)3)

         3

STEP

2:

Equation at the end of step

2:

       23x3

 9xy • ————

        33

STEP

3:

Multiplying exponential expressions :

3.1    x1 multiplied by x3 = x(1 + 3) = x4

Dividing exponents:

3.2    32   divided by   33   = 3(2 - 3) = 3(-1) = 1/31 = 1/3

Final result :

 8x4y

 ————

  3  

Step-by-step explanation:

What is the amount of sales tax owned in a $39 jacket if the tax rate is 5%

Answers

Answer:

$1.95

Step-by-step explanation:

1. Last month, John's dog ate 45 cans of dog food in
30 days. How many cans should John buy to feed his
dog for the next 6 days?

Please help me !!!

Answers

Answer:

9 cans

Step-by-step explanation:

45/30=1.5

1.5*6=9

Answer:

9 Cans of dog food

Step-by-step explanation:

You have to divide 45 the amount of cans within the 30 days. 45/30=1.5.And you have to multiply this by 6 days. 1.5×6=9

4. y = 94(0.75) *8 is an example of exponential growth
O True
O False

Answers

Answer:

false

Step-by-step explanation:

solve y= 8x + 1 and 6= 6x + 3

Answers

7x+3 is your answer for your problem

Answer:

The first one is 5 the second one is 0.5

Step-by-step explanation:

Use desmos it makes your life easier

Hope this helps! :)

There are _____ tenths in 2 tenths

Please?​

Answers

Answer:

Not sure what you mean, but there are 2 tenths in two tenths?? Just incase you meant "How many hundredths are in two tenths", the answer would be 20 hundredths.

Step-by-step explanation:

best anwser gets brain thank you show work​

Answers

Answer: 1.567 × 10⁹

Step-by-step explanation:

1.6 × 10⁹ = 1.6 × 1000000000 = 1,600,000,000

3.3 × 10⁷ = 3.3 × 10000000 = 33,000,000

1,600,000,000 - 33,000,000 = 1,567,000,000

10⁹ = 1,000,000,000

1.567 ×  1,000,000,000 = 1,567,000,000

Hope this helps!

if Emma has all a's and one d what is her gpa? she has 6 classes in total

Answers

Answer:

3.5 GPA

Step-by-step explanation:

I used a GPA calculator.

Can someone help me answer these two questions

Answers

Answer:

1. c. 2

2. a. positive

Step-by-step explanation:

Hope this helps!

Answer:

slope is 2

horizontal line = 0, not undefined

Step-by-step explanation:

4 times 67 please only serious awnsersss

Answers

Answer:

268 hope i helped

Step-by-step explanation:

Answer:

268!

Step-by-step explanation:

You can easily g0ogle this so you don't need to waste points!  

Need help with this assignment!

Answers

Answer:

x=3

Mark me if I helped you❤️

can you find the area for this?

Answers

Answer:

b. is the right answer of your question

Answer:

106.5=0.01065

26.6=0.00266

60.35=0.00266

53.25=0.005325

18 decreased 12%
NEED HELP ASAP

Answers

Answer:

17.88

Step-by-step explanation:

18- 12/ 100=

447/24=

then simplify

Answer:

20.16

Step-by-step explanation:- 12% × 18 =

- 12 ÷ 100 × 18 =

- 12 × 18 ÷ 100 =

- 216 ÷ 100 =

- 2.16

Clare used 30% less butter this month than last month when baking holiday treats. If she used 250 tablespoons of butter last month, how many tablespoons did she use this month?

Answers

Answer:

175 tablespoons.

Step-by-step explanation:

250 × 30% = 75

250 - 75 = 175

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Answers

Answer:

68%

Step-by-step explanation:

17 divided by 25 = .68

What is the measure of angle C? Enter your answer in the box. ° A quadrilateral inscribed in a circle. The vertices of quadrilateral lie on the edge of the circle and are labeled as A, B, C, and D. The interior angle A is labeled as left parenthesis x plus 15 right parenthesis degrees. The angle B is labeled as left parenthesis x plus 10 right parenthesis degrees. The angle D is labeled as left parenthesis x plus 24 right parenthesis degrees.

Answers

Answer:

can u upload a pic of the question

Answer:

Quadrilateral ABCD​ is inscribed in this circle.

What is the measure of angle C?

Enter your answer in the box.

92°

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Answers

Answer: divide by 100 is .0937

Step-by-step explanation:

At the grocery store, 6 pints of ice cream cost $14.40. How much would 40 pints of ice cream cost?

Answers

Answer:

$96

Step-by-step explanation:

14.40 / 6 = $2.40

$2.40 x 40 =

$96

Hope that helps!

The solution is $ 96

The cost of 40 pints of ice cream is given by the equation A = $ 96

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the cost of 40 pints of ice cream be A

Now , the equation will be

The cost of 6 pints of ice cream = $ 14.40

So , the cost of 1 pint of ice cream = cost of 6 pints of ice cream / 6

Substituting the values in the equation , we get

The cost of 1 pint of ice cream = 14.40 / 6

The cost of 1 pint of ice cream = $ 2.40

Now ,

The cost of 40 pints of ice cream A = 40 x cost of 1 pint of ice cream

Substituting the values in the equation , we get

The cost of 40 pints of ice cream A = 40 x 2.40

The cost of 40 pints of ice cream A = $ 96

Therefore , the value of A is $ 96

Hence , the cost is $ 96

To learn more about equations click :

https://brainly.com/question/19297665

#SPJ2

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