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
maxonik [38]
3 years ago
7

3x = 21, then x = ? please help i dont really understand and te answer choices are 7, 18, 6

Mathematics
2 answers:
Oliga [24]3 years ago
8 0

if 3x = 21 all you have to do is divide both sides of the equation by 3

3x = 21

3x divided by 3 is x, and 21 divided by 3 is 7

so then you get x = 7

Anna [14]3 years ago
6 0

Answer:7

Step-by-step explanation:

Because 3x7=21.

You might be interested in
The table in the answer space shows some of the high-profile information, in cm, for 50 participants who have attended the schoo
harina [27]

mode is 8.Hope it helps

6 0
3 years ago
What is the importance of geometry in our daily life?
kaheart [24]
Geometry is everywhere. Angles, shapes, lines, line segments, curves,<span> and other aspects of geometry are every single place you look. Letters themselves are constructed of lines, line segments, and curves.</span>
6 0
2 years ago
Is subtraction of decimals associative? If not, give a counter example.
Masteriza [31]
Associative property is only applied to addition and multiplication. Thus, it can't be applied to subtraction. This property is manifested when you get the same answer no matter where you put the parenthesis. Example of associative property is:

(50 + 2) + (92 + 6) = 52+98 = 150
50 + (2+92) + 6 = 50 + 94 + 6 = 150

Here is the counter example for the subtraction of decimals:

(3.45 - 8.92) - (1.9 - 7.3) = -5.47 - ⁻5.4 = -0.07
3.45 - (8.92 - 1.9) - 7.3 = 3.45 - 7.02 - 1.9 = -5.47
As you can see, the answers are not the same.
4 0
3 years ago
5.b) If z^(1/2)=x^(1/2)+y^(1/2) , show that (x+y-z)^2=4xy
Rudik [331]

Answer:

Step-by-step explanation:

  • (x+y-z)²= 4xy
  • (x+y-z)²- 4xy = 0
  • (x+y-z)²-(2√x√y)² = 0
  • (x+y-z-2√x√y)(x+y-z+2√x√y) =0
  • [(√x-√y)²-z]*[(√x+√y)²-z]=0
  • (√x-√y)²-z = 0 or (√x+√y)²-z = 0

We have : z^(1/2)= x^(1/2)+y^(1/2) ⇒ √z = √x + √y ⇒ z = (√x + √y)²

  • so (√x+√y)²-z = 0

so (x+y-z)²= 4xy

3 0
2 years ago
for every 300 kids in high school 2/3 of them take a language. What is the value of a number of students who dont take a languag
Anna [14]
All you have to do is divide 300 hundred by 3 and you get 100 students that don’t take a language So 200 students take language and 100 students don’t take language
3 0
3 years ago
Other questions:
  • An adult ticket to a football game was $1.75. A student ticket was $1.25. The number of student tickets sold was twice the numbe
    15·1 answer
  • What is the answer to the question
    9·1 answer
  • If you have a perimeter of 72 what are the side lengths
    13·1 answer
  • Which of the following statements is correct about ?
    8·2 answers
  • Geometry please help!!
    7·1 answer
  • Find the gradient of the line segement between the points (0,-6) and (2,-16)
    9·1 answer
  • Help me with this math question please I'm giving away brainliests​
    7·1 answer
  • Here are two spinners
    8·1 answer
  • Find the value of the power.<br><br> 3 5 = _____
    15·1 answer
  • Mathematics 7 Section 73C/SdnodYear/Week 23/Day 30
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!