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
Nat2105 [25]
3 years ago
6

If B is the midpoint of AC, and AC=8x-20, find BC.​

Mathematics
2 answers:
Natali5045456 [20]3 years ago
3 0
2(3x-1)=8x-20
SIMPLY

6x-2=8x-20
SUBTRACT 6x ON BOTH SIDES

-2=2x-20
ADD 20 TO BOTH SIDES

18=2x
DIVIDE 2 ON BOTH SIDES

X=9
SUBSTITUTE

3(9)-1

27-1

26

BC=26
Semmy [17]3 years ago
3 0

Answer:

BC=26

Step-by-step explanation:

Start with:

AB+BC=AC

Since B is the midpoint, we also know that:

AB=BC

Knowing this, we can use a system of equations and substitute AB for BC in the equation we started with:

AB+AB=AC

Let's identify our values:

AB=3x-1\\AC=8x-20

Substitute:

3x-1+3x-1=8x-20

Combine like terms:

6x-2=8x-20

Add 20 to both sides of the equation:

6x+18=8x

Subtract 6x from both sides of the equation:

18=2x

Divide by the coefficient of x, which is 2.

x=9

Substitute 9 into 3x-1

3(9)-1

Solve:

AB=26

Remember that AB=BC, thus:

BC=26

You might be interested in
A gold alloy contains 15 milligrams of gold for every 4 milligrams of copper. A jeweler uses 48 milligrams of copper to make the
Elina [12.6K]

Answer:

There are 180 milligrams of gold in the alloy

Step-by-step explanation:

because i know

7 0
3 years ago
What's the complete pattern of 3,400,000 , 34,000 , _______, 3.4 , _______ ?
zavuch27 [327]
340 and 0.34 is are the answers
6 0
3 years ago
Read 2 more answers
Please help, i don’t know how to work this out!!
victus00 [196]

Answer:

40 degrees

Step-by-step explanation:

so, a triangle is 180 degrees. you know that one angle is 60 degrees.

180= 60+ 2x + x

this is the equation of the triangle

120=3x

simplify

40=x

x= 40 degrees

hope this helps :)

5 0
3 years ago
Help me help me help me help me ​
Nitella [24]

Answer:

1. 4/12, 3/9, 2/6, 5/15

2. 4/8, 8/16, 6/12

3. 2/8, 4/16, 3/12

4. 6/8, 9/12, 4/16

Step-by-step explanation:

I'm assuming your question is about all 4 problems shown so I'll explain how to solve all of them.

1. The question is asking you to find an equivalent fraction to 1/3. The easiest way to do this is to reduce all of the options given.

To reduce fractions, first determine if the numerator and denominator share any factors. If they do, divide both terms by the shared factors until you no longer get whole numbers.

Step 1: reduce answer choices

6/16 = 3/8 (done by dividing both terms by 2)

4/10 = 2/5 (divide both by 2)

3/8 = 3/8 (fully reduced)

2/5 = 2/5 (fully reduced)

4/12 = 1/3 (divide both by 4)

5/10 = 1/2 (divide both by 5)

1/2 = 1/2 (fully reduced)

3/9 = 1/3 (divide both by 3)

2/6 = 1/3 (divide both by 2)

5/15 = 1/3 (divide both by 5)

3/8 = 3/8 (fully reduced)

3/4 = 3/4 (fully reduced)

2. This question is solved the same way as question 1.

Step 1: reduce answer choices

2/5 = 2/5

6/9 = 2/3

4/8 = 1/2

3/9 = 1/3

8/16 = 1/2

8/10 = 4/5

7/12 = 7/12

6/12 = 1/2

3. This question is solved the same way as questions 1 and 2.

Step 1: reduce answer choices

3/8 = 3/8

2/8 = 1/4

4/9 = 4/9

2/7 = 2/7

4/16 = 1/4

10/14 = 5/7

6/9 = 2/3

3/12 = 1/4

4. This question is solved the same way as questions 1, 2, and 3.

Step 1: reduce answer choices

6/8 = 3/4

4/9 = 4/9

4/6 = 2/3

9/12 = 3/4

10/12 = 5/6

6/9 = 2/3

12/16 = 3/4

7/9 =7/9

7 0
2 years ago
A popular clothing has flare pants advertised at $144 for 3 pairs. What is the constant of proportionality
ivolga24 [154]

Answer:

Constant Proportionality: 144

~ I  really hope this is correct, if not then, I'm sorry~

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • At the local sandwich shop, employees earn double time for any hours worked in addition to their regular 40-hour week. Last week
    7·2 answers
  • Traveling at 65 miles/hr how many minutes will it take to drive 125 miles
    10·1 answer
  • Need help with number 16
    10·1 answer
  • What property is illustrated by the statement? 7+(4+4)=(7+4)+4
    14·2 answers
  • in the year 2000, there were 5000 living in the town of clairmont. by 2010, the pouplotion had grown to 5600.what is the percent
    15·2 answers
  • Which is true? A 5.4793 < 5.4812 B 5.2189 = 5.219 C 5.0359 > 5.0923 D 5.0167 < 5.0121
    12·2 answers
  • Which expression is equivalent to (4−3)−6?<br><br> 418<br> 43<br> 4−18<br> 4−9
    15·2 answers
  • 4.9.18
    14·2 answers
  • Determine if the table below represents a linear function. If so, what's the rate of change?
    5·2 answers
  • At a coffee shop, the first 100 customers'<br> orders were as follows.
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!