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
zhannawk [14.2K]
2 years ago
9

Easy question! First one to answer gets brainliest! 2x + 5 = 21

Mathematics
2 answers:
tangare [24]2 years ago
6 0

2x + 5 = 21

Subtract both sides 5

2x + 5 - 5 = 21 - 5

2x = 16

Divide both sides by 2

\frac{2x}{2}  =  \frac{16}{2}  \\

x = 8

madam [21]2 years ago
4 0

Answer:

8

Step-by-step explanation:

To determine the value of "x", we need to isolate the "x" variable completely. The first step in isolating the variable is to remove the constant on the L.H.S. This can be done by subtracting 5 both sides.

⇒ 2x + 5 = 21

⇒ 2x + 5 - 5 = 21 - 5

⇒ 2x = 16

The last step in isolating the "x" variable is to isolate the cooeficient of x. This can be done by dividing the cooeficient of x both sides.

⇒ 2x = 16

[Cooeficient of x is 2]

⇒ \frac{2x}{2}  = \frac{16}{2}

⇒ x  = \frac{16}{2} = 8

In conclusion, the value of the "x" variable is 8.

You might be interested in
A figure has a vertex at (5,2). If the figure has line symmetry about the x axis, what are the coordinates of another vertex of
Fiesta28 [93]
X axis is the ones that goes left and right

(x,y)

symetric about the x axis means that the vertical distance from the x axis is the same for 2 points that are symetric about the x axis

y is height

(x,y)
(5,2)
2 is height
distance from x axis
therefor the other point is -2
(5,-2)


the other vertex is at (5,-2)
3 0
3 years ago
What is the volume of the shape below? Use 3.14 for 8in. 3 in​
musickatia [10]
The answer is 75.4

Explanation
7 0
3 years ago
Select the expression that is equivalent to (picture)
seraphim [82]
The answer to this question is x^(rt + s) since (x^r)^t becomes x^(rt) by the exponent power of a power property. Then multiplying powers of the same base results in the exponents being summed.
6 0
3 years ago
There are 438 students at a middle school. If 38% of the students participate in after school sports what would the number of st
umka21 [38]

Answer:166

Step-by-step explanation:438x.38=166

438 being the total amount of students

.38 being the 38% involved (moved percentage two to the left to make it a decimal)

6 0
3 years ago
Help me with the answer! 14 points!!
guajiro [1.7K]

Answer:

hi :D

Step-by-step explanation:

8 0
3 years ago
Other questions:
  • $6,000 dollars is invested in two different accounts earning 3% and 5% interest. at the end of one year, the two accounts earned
    11·2 answers
  • Solve for h <br><br> 12h = 4(2h-5)<br><br> h=
    5·2 answers
  • PLEASE HURRY! The price of a wallet is $32.95 and the sales tax is 7.5%. What is the total cost of the wallet?
    13·1 answer
  • Abby's score in a
    10·2 answers
  • Jodi plans to make 5 dozen cupcakes. The recipe she uses is for 2 dozen cupcakes and calls for 1 1/2 cups of flour. How many cup
    11·2 answers
  • Olly drove 56 km from Liverpool to Manchester.
    11·1 answer
  • Please, my whole grade depends on this question!!!
    6·1 answer
  • Help!!!!!!!!
    7·2 answers
  • Select “Rational” or “Irrational” to classify each number.
    5·1 answer
  • What’s y=1/2x+5. Domain=4,7,11,12
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!