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
Paladinen [302]
3 years ago
5

If x varies directly with y and x = 6 when y = 15, find x when y= 20.

Mathematics
1 answer:
Kaylis [27]3 years ago
6 0

Answer:

8

Step-by-step explanation:

Varies directly think y=kx

Varies indirectly think y=k/x

We have first option so y=kx

x=6 and y=15 means we have 15=k(6)

So k=15/6 or reducing gives=5/2

So we just found our constant of proportionality, this number never changes.  It stays the same no matter what x or y they give you...

So the equation is y=5/2 *x

Now what is x if y=20

Plug in 20=5/2 *x

So x=20*2/5=40/5=8

You might be interested in
The algebraic expression for​ "the quotient of 77 and​ x" is
Illusion [34]
The correct answer is:

_______________________
 "  77 / x " ;  or;  "x ÷ 77" .

_________________________
In algebra, the former is preferred; that is:  " 77 / x " .
7 0
3 years ago
PLEASE HELP ASAP WORTH A LOT OF MY GRADE
ella [17]

Answer:

D

Step-by-step explanation:

Im almost positive its d because for triangles you multiply by radical two for when its 45 degrees then the side for the one part of the triangle would be 26 radical 2 multiplied by 39 to get 1397.243 then you double that to get d

6 0
2 years ago
A rhino can run 28 miles per hour. What is that speed in feet per second, to the nearest whole number?
Mrrafil [7]

Answer:

A rhino runs at a speed of about 28 miles per hour.

We need to determine the speed in feet per second.

Converting miles to feet:

The miles can be converted to feet by multiplying 5280 with 28 miles per hour.

Thus, we have;

28 x 5280 = 14784028 × 5280 = 147840

Thus, the speed of the rhino in feet per hour is 147840

Converting hours to seconds:

The hours can be converted into seconds by dividing 147840 by 3600 (Because an hour has 60 seconds in a minute and 60 minutes in an hour)

Thus, we get;

Speed=\frac{147840}{3600}Speed=

3600

147840

Speed = 41.066667Speed=41.066667

Rounding off to the nearest whole number, we get;

Speed = 41

Therefore, the speed of the rhino is 41 feet per second.

6 0
3 years ago
3. Jen’s parents buy a tablet for her to use in school. Of the $1500 cost, her parents expect her to pay back $1000 one year lat
NNADVOKAT [17]

Answer:

<h3>33.3%</h3>

Step-by-step explanation:

Using the formula for calculating simple interest as shown;

Simple Interest = Principal * Rate *Time/100

Principal = Cost of tablet = $1500

Interest after one year  =  $1500-$1000 = $500

Time = 1year

Substituting this values into the formula;

500 = 1500*rate*1/100\\Cross\ multiplying\\50,000 = 1500 * rate\\Rate = 50,000/1500\\Rate = 33.3%

The interest rate that her parents assumed is 33.3%

4 0
3 years ago
The equation for the circle below is x^2+y^2=4. what is the length of the circle’s radius
Inessa05 [86]
2 because in the equation of a circle it is x^2 + y^2 = r^2, r=radius so you would take the square root of 4, leaving the radius of the circle to be 2.
6 0
3 years ago
Other questions:
  • Which pair of numbers is relatively prime?A.88 and 121 B.92 and 274 C.145 and 1300 D.187 and 290
    7·1 answer
  • Can anyone solve this for me please?
    6·1 answer
  • Is one third greater than 3/5
    15·2 answers
  • What is the answer to this question on he picture
    10·1 answer
  • It is possible for a linear equation to have exactly two solutions.<br><br> True or False?
    13·1 answer
  • Is 1 1/2 gallons greater than 6 quarts
    9·1 answer
  • En la figura anterior, las rectas M y N son <br><br>paralelas. ¿Cuántos grados mide el ángulo BAC ?
    5·1 answer
  • No entiendo matemáticas alguien me podría ayudar​
    14·1 answer
  • Solve: 2x + 6 + 10 = 12
    11·2 answers
  • Lo pueden resolver por favor !!!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!