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
vodomira [7]
3 years ago
6

Solve x2 − 20 = 0. If necessary, round to the nearest hundredth.

Mathematics
1 answer:
kicyunya [14]3 years ago
3 0

Answer:

<u>x</u><u> </u><u>is</u><u> </u><u>4</u><u>.</u><u>4</u><u>7</u>

Step-by-step explanation:

{ \sf{ {x}^{2} - 20 = 0 }} \\ { \sf{ {x}^{2}  = 20}} \\ { \sf{x =  \sqrt{20} }} \\ { \sf{x = 4.47}}

You might be interested in
Describe a proportional relationship involving some product or service and its cost that IS proportional. Explain why it is a pr
kvasek [131]

Natalie is an expert archer. The following table shows her scores (points) based on the number of targets she hit.

Targets hit 111 222 555

Points 333 666 151515

Plot the ordered pairs from the table.

Are Natalie's points proportional to the number of targets she hit?

Choose 1 answer:

(Choice A)

A

Yes

(Choice B)

B

No

6 0
3 years ago
Read 2 more answers
Answer the following true or false. Justify your answer.
Anna007 [38]

Answer:

a) False b) False c) True d) True e) True

Step-by-step explanation:

a) If A is a subset of B, and x∈B, then x∈A. False

Suppose A is Z (Set of Integers), and B is R (Set of Real Numbers). Then A is a subset of B. x ∈ B, let's say x equals π. If x ∈ B (B = Real Numbers) and x=π then x ∉ A (Z).

We could call A, any other subset of Real numbers (Q, I,..) and we both would come up to the same conclusion when it comes to Real numbers the Set.

So this conclusion is False. Not always an element of a subset is an element of a set.

b) False

For this one, I've drawn some lines, and it is useful to work with them.

Given the set {(x,y) ∈ R²| 0<x<0} then all negative and positive numbers but zero belong to this set.

c) If A and B are square matrices, then AB is also square. True

Taking into account the rules for multiplying matrices. The number of columns of A must be the same number of lines of B to there can be a matrix product.

Whenever we multiply square matrices, we'll always get square matrices. Then this conclusion is true.

d) A and B are subsets of a set S, then A∩B and A∪B are also subsets of S. True

Suppose A= Z (Integer Numbers) and B=Q (Rational Numbers) and S= R (Real Numbers)

A∩B = Z∩Q=∅ and A∪B =Z∪Q = subset

Since the ∅ empty set ⊂ in every set and ZUQ is another Subset of R this is a True conclusion.

e) True. For a matrix A, we define A²= AA

For any Power of Matrices, all we have to do is multiply any given matrix by itself for a given number of times.

M²=M*M

M³=M*M*M

7 0
3 years ago
Write 7.65040 x10-4 power in scientific notation
gizmo_the_mogwai [7]

It's already in scientific notation form;

Answer of your question,

3x+46 = 10x-80

7x = 34

x = 4.85

5 0
3 years ago
How many factors of muliplication does 20 have
amid [387]

Here are some factors of 20!

1x20=20

2x10=20

4x5=20

5x4=20


Therefore there are 4 factors of 20.

4 0
2 years ago
Read 2 more answers
2) A product originally costs $125. If the product goes on sale for 20% off, and then goes on sale for an additional 30% off, wh
alukav5142 [94]
To do these, always convert the percents to decimals, so you can subtract it from 1. Remember, 1 is the whole. When you subtract the part that's taken off, you are left with what you have to pay. If you have 20% off of $100, then you are paying for 80% of $100. **of means to multiply** so you would multiply: 0.8X100, which would be $80.

First, multiply 125x0.8

Multiply that answer by 0.7

You should get B. $70

3) multiple 22.90x0.93

You should get D
7 0
3 years ago
Read 2 more answers
Other questions:
  • The value of the 7 in 27,459 is how many times the value of the 7 in 40,735
    14·2 answers
  • Plz i need help i don't get this one
    14·1 answer
  • What does -3 (-5.6) equal?
    12·1 answer
  • P+3 over m = -1 solve for p
    10·1 answer
  • I need help asap thanks
    6·1 answer
  • Please help I have no idea
    10·2 answers
  • A badminton club has 330 members. 240 are adults and the rest are children. Two thirds of the children are boys and the rest are
    9·1 answer
  • Hi I need help asap <br><br> I don’t understand it can u help me for a and b
    8·1 answer
  • _.._
    12·2 answers
  • Need heeeelp please<br>​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!