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
7nadin3 [17]
3 years ago
9

7(2x-5)=21 What is x?

Mathematics
1 answer:
Over [174]3 years ago
6 0

Answer:

x = 4

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

Step-by-step explanation:

<u>Step 1: Define Equation</u>

7(2x - 5) = 21

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Distribute 7:                   2x - 5 = 3
  2. Isolate <em>x</em> term:                2x = 8
  3. Isolate <em>x</em>:                         x = 4

<u>Step 3: Check</u>

<em>Plug in x into the original equation to verify it's a solution.</em>

  1. Substitute in <em>x</em>:                  7(2(4) - 5) = 21
  2. Multiply:                             7(8 - 5) = 21
  3. Subtract:                            7(3) = 21
  4. Multiply:                             21 = 21

Here we see that 21 does indeed equal 21.

∴ x = 4 is the solution to the equation.

You might be interested in
If you sleep for 9 h one night, what fractional part of a day did you spend sleeping?
Angelina_Jolie [31]

Answer:

3/8 of the day

Step-by-step explanation:

A day is 24 hours

You spend 9 of them sleeping

The fraction you spend sleeping is

9/24

You can simplify the fraction by dividing the top and bottom by 3

9/3 = 3

24/3 = 8

3/8

7 0
3 years ago
Can a triangle have sides with the given​ lengths? Explain.
Nookie1986 [14]
No because when you add any 2 sides the answer has to be bigger than the 3rd side

ex: 2+7=9
9 is too small, so the tips of the side that is 2ft would not touch the side that is 7ft
4 0
3 years ago
Dude is making 12 pounds of nut mixture with macadamia nuts and almonds. Macadamia nuts cost $9 per pound and almonds cost $5.25
pshichka [43]

Number of pounds of macadamia nuts is 8 pounds and number of pounds of almonds is 4 pounds.

<u>Step-by-step explanation:</u>

Step 1:

Given total pounds of mixture = 12 pounds, cost of macadamia nuts per pound = $9, cost of almonds per pound = $5.25, total cost of mixture per pound = $7.75.

Let number of pounds of macadamia nuts be x and number of pounds of almonds be 12-x.

Step 2:

Form an equation using the above information.

⇒ 9x + 5.25 (12-x) = 12 × 7.75

⇒ 9x + 63 - 5.25x = 93

⇒ 9x - 5.25x = 30

⇒ 3.75x = 30

⇒ x = 8

Number of macadamia nuts is 8 pounds.

Step 3:

Calculate number pounds of almonds

⇒ Number of pounds of almonds = 12 - x = 4 pounds.

5 0
3 years ago
If ΔRED ≅ ΔTAN, then which of the following statements is not true? RE ≅ TA ∠E ≅ ∠A RD≅ TA ∠D ≅ ∠N
Assoli18 [71]

Answer:

RD≅ TA

Step-by-step explanation:

RD≅ TA is not true statement as they are not corresponding sides.

4 0
3 years ago
What is the answer to 9÷2/3
AlexFokin [52]

9 : 2/3 =

9 * 3/2 =

(3*9=27)

27/2 Is your answer

4 0
3 years ago
Other questions:
  • Write the fraction 6/6 as a sum of fractions three different ways
    13·2 answers
  • <img src="https://tex.z-dn.net/?f=%28x%20-%207%29%28y%20-%209%29" id="TexFormula1" title="(x - 7)(y - 9)" alt="(x - 7)(y - 9)" a
    7·1 answer
  • What is expression is <br> equivalent to 5(9+t)
    12·1 answer
  • What is the distance between the points (-4,0) and (-7, -14) ?​
    13·1 answer
  • HELP and Happy valentines T-T
    15·1 answer
  • What’s the answer thank you
    12·1 answer
  • Lauren invests money in an accout paying simple interest.She invests $50 and no money is added or removed from investments.After
    7·1 answer
  • Store A sells four bags of chips for $5.00. Store B sells eight bags for $7.00. Which has the lower unit price? Show your work u
    14·1 answer
  • Help me rn pleasee !!
    6·2 answers
  • Select the three fractions that are equal to 4/12.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!