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
Phantasy [73]
4 years ago
8

X^2-81=0 solve the question

Mathematics
2 answers:
WARRIOR [948]4 years ago
8 0

Answer:

9 and -9

Step-by-step explanation

add 81 to both sides

take square root of both sides

NeTakaya4 years ago
3 0

Answer:

x=+9,-9

Step-by-step explanation:

x^2-81=0\\x^2=81\\x=\sqrt{81}\\x=9,-9

You might be interested in
Use the distributive property to write an equivalent expression.<br> 9(8w + 4)
Harlamova29_29 [7]

Answer:

72w+36

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The price of a sweater was reduced from 20 to 12 by what percentage was the price of the sweater reduced
dmitriy555 [2]

Answer:

40%

Step-by-step explanation:

You subtract 20 from 12 to get 8.

Divide 20 from 8 to get 0.40.

6 0
3 years ago
Read 2 more answers
Question 65 pts Which statement about signal phrases is true? (5 points) Group of answer choices Signal phrases should be worded
damaskus [11]

Answer:

The answer is A.

Step-by-step explanation:

I took the test!

6 0
3 years ago
SOMEONE PLEASE HELP WILL MARK BRAINLIEST PLEASE EXPLAIN
zalisa [80]

Answer:

a. (x+5)^2 = 49

b. (x+7)^2 = (x+1)^2

Step-by-step explanation:

So the term "a number" is always going to be x. input x into the sentences. "X plus five, then squared, is forty-nine". when they do "is __", that means equal to. In the second question, seven more than x is x + 7 (the two numbers are interchangeable here). Equivalent also means equal. hope this helped :)

4 0
3 years ago
Read 2 more answers
The mean of a set of data is -3.82 and its standard deviation is 2.31. Find the z score for a value of 3.99.
gtnhenbr [62]

Answer:

The z- score for a value of 3.99 will be 3.38.

Step-by-step explanation:

It is given that the mean of a set of data is -3.82 and its standard deviation is 2.31.

Thus, the value of the z-score=\frac{value-mean}{standarddeviation}

=\frac{3.99-(-3.82)}{2.31}

=\frac{3.99+3.82}{2.31}

=\frac{7.81}{2.31}

=3.38

Thus, the z- score for a value of 3.99 will be 3.38.

6 0
3 years ago
Other questions:
  • a girl scout troop must sell more than 800 boxes of cookies to earn a trip to camp. If troop #842 HAS SOLD 871 BOXES , HOW MANY
    15·2 answers
  • If a normal distribution has a mean of 104 and a standard deviation of 6 what is the z score for a value of 110?
    10·1 answer
  • How to solve equations with variables on both sides?
    15·1 answer
  • of a class of 32 students ,17 study music and 20 studyart what is the least number of students who could study both music and ar
    5·2 answers
  • Jennie is training for a race. On Tuesday She finished her sprint 0.305 second faster than on Monday. be How can you explain the
    12·2 answers
  • A single six-sided die is rolled. Find the probability of rolling a seven
    6·2 answers
  • Help me please I need to choose.​
    9·1 answer
  • -8 add someting equals what
    13·1 answer
  • HELP ME OUT PLEASE!
    15·1 answer
  • Izza izza izza izza izza izza Izza izza izza izza izza izza
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!