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
joja [24]
3 years ago
10

I need assistance!!!!

Mathematics
2 answers:
bulgar [2K]3 years ago
4 0

Answer:

Step-by-step explanation:

DE = (1/2) * AC           {Midpoint theorem}

9x - 20 =\frac{1}{2}(5x + 12)

2(9x - 20) = 5x  + 12

2*9x - 2*20 = 5x + 12

18x - 40 = 5x + 12

18x -5x - 40 = 12

   13x  - 40  = 12

           13x  = 12+40

           13x  = 52

             x  = 52/13

            x = 4

AC = 5x + 12

     = 5*4 + 12

     = 20 +12

AC = 32

erastovalidia [21]3 years ago
3 0

Answer:

Step-by-step explanation:

Because midpoints were used to make similar triangles we can say

AC=2(DE)

5x+12=2(9x-20)

5x+12=18x-40

-13x+12=-40

-13x=-52

x=4

AC=5x+12

AC=5(4)+12

AC=20+12

AC=32

You might be interested in
A cookie recipe requires 3/4 cup of flour to make 1.5 dozen cookies. How much flour is needed to make 1 dozen cookies
NISA [10]

Answer:

half a cup of flower -> 1/2

Step-by-step explanation:

i used a proportion to figure this out.

6 0
3 years ago
5y+4 times 2 what is the coefficient in this expression?
rodikova [14]

Answer: 5

Step-by-step explanation: The coefficient is the number that comes right before the variable. Another way to say this is it's what the variable is multiplied by.

3 0
3 years ago
PLS HELP ILL GIVE BRAINLIEST.
liberstina [14]

Answer:

Step-by-step explanation:

I think it increased by 20% I think or it’s 25% think

3 0
3 years ago
the pet store sells bags of pet food. there are 4 bags of cat food. one sixth of the bags of food are bags of cat food. how many
const2013 [10]
28 bags if you include the cat food (which you would)
8 0
3 years ago
Read 2 more answers
Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students
Nezavi [6.7K]

Answer: A. 85.7

Step-by-step explanation:

Given : Two sections of a class took the same quiz.

Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90.

We know that  , \text{Mean}=\dfrac{\text{Sum of observations}}{\text{No. of observations}}

Then , for section A :

\text{Mean score }=\dfrac{\text{Sum of scores in sec A}}{\text{No. of students}}

\Rightarrow\ 80=\dfrac{\text{Sum of scores in sec A}}{15}\\\\\Rightarrow\ \text{Sum of scores in sec A}=80\times15=1200

Similarly in Section B, \text{Sum of scores in sec B}=90\times20=1800

Total scores = Sum of scores in sec A+Sum of scores in sec B

=1200+1800=3000

Total students = Students in sec A +Students in sec B

=15+20=35

Now , the mean score for all of the students on the quiz =\dfrac{\text{Total score}}{\text{Total students}}

=\dfrac{3000}{35}=85.7142857143\approx85.7

Hence, the approximate mean score for all of the students on the quiz = 85.7

Thus , the correct answer is option A. 85.7.

7 0
3 years ago
Other questions:
  • Seth traveled 1 mile in 57.1 seconds. About how fast does Seth travel in miles per hour
    5·1 answer
  • What is 3.56 in its simplest form
    11·1 answer
  • Write - 1/14, 7/9,-4/5 in order from bet<br> to<br> greatest
    7·1 answer
  • What is the solution to the system of equations 6x+2y=6 7x+3y=5
    10·1 answer
  • HELP ASAP IT'S AN EMERGENCY​
    5·1 answer
  • Which is the quotient of 11/12 divide 5/7 <br> a.55/84 <br> b.16/19 <br> c.77/84 <br> d.1 17/60?
    14·1 answer
  • Please help!!!!!!!!!
    13·1 answer
  • I’d really appreciate some help :)
    8·1 answer
  • 8) How many terms of the arithmetic sequence (2, 4, 6, 8, ...} will give a sum of 600?
    13·1 answer
  • Find the equation of the normal to the curve y=x^2-2x^2-4x+1 at thepoint (-1,2)​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!