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
svetlana [45]
3 years ago
15

What is the principal square root of 81?

Mathematics
2 answers:
Bumek [7]3 years ago
6 0
The square foot of 81 is 9
ch4aika [34]3 years ago
5 0

Answer:

9

Step-by-step explanation:

9*9 = 81

You might be interested in
Peter is reading a 193-page book. He has read three pages more than one fourth of the number of pages he hasnt yet read. How man
Anit [1.1K]
<span>Let n = the number of pages not read
Then the number of pages read = n/4 + 3
Since the total number of pages is 193, we have

n + n/4 + 3 = 193
5n/4 = 190
n = 152
At 8 pages per day it will take 152 pages/ 8 pages/day = 19 days

</span>
5 0
3 years ago
The hypotenuse of a 45°-45°-90° triangle measures 128 cm. A right triangle is shown. The length of the hypotenuse is 128 centime
Aleks [24]

Answer:

64√2 or 64 StartRoot 2 EndRoot

Step-by-step explanation:

A 45-45-90 traingle is a special traingle.  Let's say one of the leg of the triangle is x. The other one is also x because of the isosocles triangle theorem.  Therefore, using the pytagorean theorem, you find that x^2+x^2=c^2.  2(x)^2=c^2.  You then square root both sides and get c= x√2.  

Therefore, the two legs are x and the hypotenuse is x√2.  x√2=128 because the question says that the hypotenuse is 128.  Solve for x by dividing both sides by √2.  X=128/√2.  You rationalize it by multiplying the numberator and denominator of the fraction by √2.  √2*√2= 2.

X=(128√2)/2= 64√2 cm.

Since X is the leg, the answer would be 64√2

3 0
3 years ago
Read 2 more answers
Which of the following expressions is equivalent to (x + 5) ^2
Karo-lina-s [1.5K]
(X+5)^2 = x^2 +10x + 25


the expression that is equivalent to

To multiply it we apply FOIL method
Multiply x with x+5 first and then we multiply 5 with x+5






7 0
3 years ago
Identify the factors of x2-8x-20
sukhopar [10]
Simplifying x2 + -8x = 20 Reorder the terms: -8x + x2 = 20 Solving -8x + x2 = 20 Solving for variable 'x'. Reorder the terms: -20 + -8x + x2 = 20 + -20 Combine like terms: 20 + -20 = 0 -20 + -8x + x2 = 0 Factor a trinomial. (-2 + -1x)(10 + -1x) = 0 Subproblem 1Set the factor '(-2 + -1x)' equal to zero and attempt to solve: Simplifying -2 + -1x = 0 Solving -2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1x = 0 + 2 -1x = 0 + 2 Combine like terms: 0 + 2 = 2 -1x = 2 Divide each side by '-1'. x = -2 Simplifying x = -2 Subproblem 2Set the factor '(10 + -1x)' equal to zero and attempt to solve: Simplifying 10 + -1x = 0 Solving 10 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -1x = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -1x = 0 + -10 -1x = 0 + -10 Combine like terms: 0 + -10 = -10 -1x = -10 Divide each side by '-1'. x = 10 Simplifying x = 10Solutionx = {-2, 10}
6 0
3 years ago
Read 2 more answers
The graph shows Marcia's walk. Which statement best describes what Marcia could be doing on the interval from B to C? A. Marcia
vodomira [7]

Answer:

B. Maria is walking home

Step-by-step explanation:

Sana nakatulong

3 0
3 years ago
Read 2 more answers
Other questions:
  • Math need to simplify the expression
    13·2 answers
  • Write a description of how a diagram can help you solve 2x40
    5·1 answer
  • The cost y (in dollars) to rent a bicycle is proportional to the number x of hours that the bicycle is rented. It costs $24 to r
    15·1 answer
  • 1.60 divided by 20
    10·2 answers
  • Urgent please help!!
    11·1 answer
  • The product of 4 and 1/6 is _
    14·2 answers
  • A molecule of sodium carbonate contains 2 atoms of sodium to every 3 atoms of oxygen. Could a compound containing 12 atoms of so
    12·1 answer
  • Why are vectors important?
    10·1 answer
  • PLEASE HELP I'M MARKING BRAINLIEST!!!!!!
    9·1 answer
  • Please help with the attached photo.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!