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
Ahat [919]
3 years ago
7

Simplify the radical expression by rationalizing the denominator 4/√21

Mathematics
2 answers:
Tcecarenko [31]3 years ago
4 0

\frac{4}{\sqrt{21}} =\frac{4\sqrt{21}}{\sqrt{21}\sqrt{21}} =\frac{4\sqrt{21}}{21}

Lynna [10]3 years ago
3 0

I think

\dfrac{4}{\sqrt{21}}

is about as simple as this is going to get. For some reason teachers like the radicals in the numerator, so we multiply top and bottom by \sqrt{21} and get

\dfrac{4}{\sqrt{21}} \times \dfrac{\sqrt{21}}{\sqrt{21}} = \dfrac{4\sqrt{21}}{21}

Answer: \dfrac{4\sqrt{21}}{21}

You might be interested in
Please help! Number 9) picture is included! Determine the base of the rectangle. (10 points) please help as soon as possible! :)
Juli2301 [7.4K]
The answer is 128m^2/8m equals 16m
3 0
3 years ago
JoAnn is taking a trip to visit her family. After one day of driving, she has traveled 315.2 miles. If JoAnn lives 510 miles fro
Elena L [17]

Answer:

194.8 miles

Step-by-step explanation:

510 - 315.2 = 194.8

Hope this helps!

8 0
3 years ago
Read 2 more answers
A book costs $ 67. How much will be paid for 102 such books?​
Ghella [55]

The cost of one book = $ 6 7

Number of books = 1 0 2

The cost of 102 books = $ 67 × 102

= $ 6834

Therefore, cost of 102 books = $ 6834

6 0
2 years ago
Read 2 more answers
Please help me with this
Simora [160]
Answer: A and B
Explanation: If you draw the graph out it crosses the points (1,2) and (-1,-2) and those are points A and B
3 0
2 years ago
I can’t find the surface area and volume of this cylinder, can someone please help?
stealth61 [152]

Answer:

112 PIE CM CUBE

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • ( m + 4 ) ( m + 1 )
    12·1 answer
  • Please help me..............................
    10·1 answer
  • These two problems please help
    11·1 answer
  • The length of a rectangle is 24 units. Can the perimeter x of the rectangle be 60 units when its width y is 11 units?
    9·2 answers
  • Richard goes to the electronics store. He buys 2 memory cards that cost $8.99 each and 3 packages of batteries that are on sale
    14·2 answers
  • Which of the following is the solution
    9·1 answer
  • Kayla is running for charity. Her dad pledges to give her $0.50 per mile she runs. Her mom pledges to give her a flat donation o
    8·1 answer
  • Who knows what 0.976 + 0.99
    14·2 answers
  • Last question for the night.
    9·2 answers
  • Solve the following system of equations for all three variables.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!