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
exis [7]
2 years ago
12

The work of a student to solve the equation 3(3x − 4) = 8 + 2x + 5 is shown below: Step 1. 3(3x − 4) = 8 + 2x + 5 Step 2. 6x − 7

= 13 + 2x Step 3. 6x − 2x = 13 + 7 Step 4. 4x = 20 Step 5. x = 5 In which step did the student first make an error and what is the correct step? (1 point) Step 2, 9x − 12 = 13 + 2x Step 2, 9x − 4 = 2(6 + x + 3) Step 3, 6x + 2x = 13 + 7 Step 3, 6x − 2x = 13 − 7
Mathematics
1 answer:
Mamont248 [21]2 years ago
8 0

Answer:

  (a)  Step 2. 9x -12 = 13 +2x

Step-by-step explanation:

The distributive property says a factor outside parentheses multiplies each term inside parentheses. It is an error to do addition of the factor, or to miss multiplying a term.

In Step 2 of this "solution", the factor of 3 is erroneously <em>added</em> to each coefficent inside parentheses. It should be <em>multiplied</em>.

Correct Step 2: 9x -12 = 13 +2x

__

The rest of the solution should be ...

  Step 3: 9x -2x = 13 +12

  Step 4: 7x = 25

  Step 5: x = 25/7

___

<em>Check</em>

  3(3(25/7) -4) = 8 + 2(25/7) +5

  3((75 -28)/7) = 13 +50/7

  141/7 = 141/7 . . . . . answer checks OK

You might be interested in
What's wrong with the problem: 5pints times 1cup divided by 2 pints = 2.5cups
lys-0071 [83]
I don't really know how the table works, but there are two cups in a pint, so 5 pints * 0.5 pints would be 2.5 pints, and 2.5 pints divided by 2 pints would be 1.25 pints?
3 0
3 years ago
Find m<br> (look at the picture)
Advocard [28]

Answer:

Step-by-step explanation:

since you are learning about similar triangles... i'd guess that some where of the picture.. there is some words that say,  that the two smaller triangles are the same, similar , congruent.. so that we can just add up angles 1 + 2 or

13 + 13 = 26 °

4 0
3 years ago
Pre-calc<br> Evaluate f(2) using substitution:<br> f(x) = 2x^3 – 3x^2– 18x-8
krek1111 [17]

Answer:

f(2) = -40

Step-by-step explanation:

Just substitute x=2 into the function:

f(x) = 2x³ - 3x² - 18x - 8

f(2) = 2(2)³ - 3(2)² - 18(2) - 8

f(2) = 2(8) - 3(4) - 36 - 8

f(2) = 16 - 12 - 44

f(2) = 4 - 44

f(2) = -40

8 0
2 years ago
A table is 2 feet wide it is 6 times as long it is wide
yan [13]

Answer:

Length = 12 feet

Perimeter = 28 feet

Area = 24ft²

Step-by-step explanation:

You didn't ask a question so I don't know what the answer you want is so I assumed it was related to one of the answers shown above.

To calculate the length, you simply do 6*2

which is equal to 12.  

The length is 12 feet.

However, if you want to find the perimeter:

12 + 12 + 2+ 2 =  28ft

If you wanted to find the area:

12*2 = 24ft²

I hope this helps!

7 0
3 years ago
Hurry please!!!! Unit 4 congruent triangles
STatiana [176]

Answer:

I don't think u put up a picture

4 0
3 years ago
Read 2 more answers
Other questions:
  • Whats the point and slope of the equation y + 9 = -2/3(x - 3)?
    13·1 answer
  • What is the volume of the given prism? Round the answer to the nearest tenth of a centimeter. The figure is not drawn to scale.
    12·2 answers
  • How do I slove this eqaution, and whats the answer?<br> -3(n+6)+10=-9
    11·1 answer
  • What is the value of x?
    14·1 answer
  • What is the difference between the most expensive fruit and the least expensive fruit?
    12·2 answers
  • 3. In the figure, gllp. Which angles are same side interior angles? Select all 1 point
    5·2 answers
  • Evaluate<br>THANK YOU!!!​
    6·1 answer
  • Help me please i don’t have my notes and I forget how to do this
    12·1 answer
  • In the given figure, what is the value of x?
    14·1 answer
  • Select the recursive and explicit formula for the Arnold family 2 answers
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!