1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
faltersainse [42]
3 years ago
12

If x varies as y and if x=20 when y=9 , find x when y=18​

Mathematics
1 answer:
andrezito [222]3 years ago
3 0

Answer:1/2 y

Step-by-step explanation:

We can solve this using ration reasoning:  

x

2

x

1

=

y

2

y

1

Explanation:

If  

x

varies directly with  

y

(written  

x

∝

y

), then doubling  

y

means doubling  

x

, so the rations of final values and initial values will be the same:

x

2

x

1

=

y

2

y

1

In this case,

x

2

9

=

24

18

x

2

=

9

⋅

24

18

=

12

Or, intuitively, if  

x

∝

y

and  

x

=

9

when  

y

=

18

, we can conclude that

x

=

1

2

y

and  

1

2

of 24 is 12.

You might be interested in
What is the slope line ?
sweet-ann [11.9K]

Answer:

-3.....

have a nice day

3 0
3 years ago
Read 2 more answers
A landing pad for a helicopter is in the shape of a circle with a radius of 7 meters. Which of the following is closest to the a
ANTONII [103]

Answer:

The approximate value of the area is 153.86\ m^{2}

Step-by-step explanation:

we know that

The area of the circle (landing pad) is equal to

A=\pi r^{2}

we have

r=7\ m

substitute

A=\pi (7)^{2}

A=49\pi\ m^{2} ----> exact value of the area

Find the approximate value

assume \pi=3.14

A=49(3.14)=153.86\ m^{2} ------> approximate value of the area

5 0
3 years ago
Read 2 more answers
PLEASEEE URGENT !!!!!!!!
xenn [34]

Answer:

Find the X and Y Intercepts 3x-5y=-20

Find the X and Y Intercepts 3x-5y=-20. 3x−5y=−20 3 x - 5 y = - 20. Find the x-intercepts. Tap for more steps

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
a cylinder shaped can needs to be constructed to hold 400 cubic centimeters of soup. the material for the sides of the can costs
fredd [130]

The dimensions of the can are radius of can = 4cm and

height of can = 78.6cm

What is the volume of cylinder?

A cylinder can be seen as a collection of multiple congruent disks, stacked one above the other. In order to calculate the space occupied by a cylinder, we calculate the space occupied by each disk and then add them up.

Thus, the volume of the cylinder can be given by the product of the area of base and height.

Volume of cylinder = πr²h

According to the given question:

We have V cylinder = V = 400cc

We will first find the areas involved

Let x = radius of base then area of the base =  π*x² and this is the area of the top too

For lateral area we need to get h the height of the cylinder as function of x

V = πx²h   ⇒  h= v/πx²    ⇒   h = 400/πx²

Now the total area of the cylinder is:

A(x) = Area of the base + area of the top + lateral area

A(x) = 2*π*x² + 2πx h ⇒  A(x) =  2*π*x² + 2πx (V/πx² )

A(x) =  2*π*x² + 800/x

Taking derivatives:

A´(x)  =  4πx  - 800/x²

A´(x) = 0                4πx  - 800/x² =0     ⇒ πx - 200/x² = 0

( πx³  -  200 )/ x²  = 0      

πx³  -  200 = 0      

x = 4 cm

and h = 400/πx²    ⇒  h = 78.6 cm

To know more about volume of cylinder visit

brainly.com/question/24337953

#SPJ4

3 0
11 months ago
Even moreeeeeeeee freeeeeee pointsssssssssss
Llana [10]

Answer:

Thankkkkkkkkkkkkkkkkk youuuuuuuuuuuuuuu!!!!!!!!

Step-by-step explanation:

Have a blessed day!!!!!

7 0
3 years ago
Read 2 more answers
Other questions:
  • ASAP I GIVE BRAINEST AND 10 PT. (ALREADY OVERDUE)<br><br> answer the question below
    11·1 answer
  • Fahrenheit and celsius temperatures are related by the formula\what is the celsius temperature if the temperature is -22ºf? A. -
    8·1 answer
  • if you’re rolling a 6 sided number cue with the numbers 1-6 what is the probability of rolling an odd number
    8·1 answer
  • can someone solve this question for me please? enter the ordered pair that is the solution to the system of equations graphed be
    12·1 answer
  • F(x) = x + 2
    11·1 answer
  • (no one answered and I posted 18 mins ago)
    5·1 answer
  • Select the correct answer from the drop-down menu.
    5·2 answers
  • Which is equivalent to One-fourth x? StartFraction 1 over 8 EndFraction x + StartFraction 1 over 8 EndFraction x StartFraction 1
    13·2 answers
  • Two of the exterior angles of a triangle are $158^\circ$ and $99^\circ.$ Find the third exterior angle, in degrees.
    8·1 answer
  • 1. What is the square root of 225?*<br> o<br> 15<br> 12<br> 112.5<br> 450
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!