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
Tanya [424]
3 years ago
12

What is the value of x?

Mathematics
2 answers:
lorasvet [3.4K]3 years ago
6 0

Answer:

x=9

Step-by-step explanation:

We can use similar triangles and ratios.  Put the small triangle side over the large triangle side.

9cm            3x -20

----------   = ----------------    We need to add the sides to get to the larger triangle

72+9 cm   3x-20 + 56


We can cross multiply to solve

9 * (3x-20+56) = (72+9) * (3x-20)

Simplify

9*(3x+36) = 81*(3x-20)

Distribute

27x +324 = 243x -1620

Subtract 27x from each side

27x-27x +324 = 243x-27x -1620

324 = 216x-1620

Add 1620 to each side

324+1620 = 216x

1944 = 216x

Divide each side by 216

1944/216 = 216x/216

9=x

Art [367]3 years ago
6 0

Answer:

im not great at math but i think x=9

Step-by-step explanation:

9/72=0.125

72*0.125=9

so 56*0.125=7

therefore 3x-20=7

solve for x

3x - 20 = 7  

3x = 7 + 20  

3x = 27 (divide both sides by 3 to get x)  

3x/3 = 27/3  

x = 9  

......

.......

or you can try

56/72=0.77777777777

72*0.77777777777=56

so 9*0.77777777777=7

therfore 3x-20=7

solve for x

3x - 20 = 7  

3x = 7 + 20  

3x = 27 (divide both sides by 3 to get x)  

3x/3 = 27/3  

x = 9  

You might be interested in
Looking for a math tutor please message me. I'm in algebra 2<br>11th grade.
RideAnS [48]
I ma taking algebra 2 also so i can help any time
6 0
2 years ago
Number 6 part a &amp; b<br> Number 7<br> Please &amp; thank you
miv72 [106K]

Answer:

6- Part A: 750a+1200r=1000000

    Part B: 1065a+876r=1000000

Solution of the system: a\approx521.739\;\;\;\;b\approx507.246

Step-by-step explanation:

<u>Part A:</u>

In words, the equation is formed like this:

Total kg of Arabica + Total kg of Robusta = Total kg of coffee

Now, the total of each yield is calculated by the product of kg/hectare and number of hectares. Thus, the equation is:

750a+1200r=1000000

<u>Part B:</u>

In words:

Arabica's worth + Robusta's worth  = plantation worth

Each yield's worth is given by the product of the price per kg and the corresponding production. So, the equation is:

1.42(750a)+0.73(1200r)=1000000\\1065a+876r=1000000

3 0
3 years ago
How much acetic acid is in a 5 liter container that is marked 80% acetic acid. How much is water
Vinvika [58]

Answer:

1 liter of water

Step-by-step explanation:

If 80 % is acid that's means 4 liters of the 5 is acid. (0.8 * 5)

The remaining amount is 1

8 0
3 years ago
Read 2 more answers
LaTanya leaves her house at 12:30pm and bikes at 12 mi/h to marta’s House she stays at marta’s House for 90mij both girls walk b
babymother [125]

Answer:

2.9 mi

Step-by-step explanation:

The time difference t between 12.30pm and 3.30pm is 3h.

Let the distance to Marat's house be s.

The equation to calculate velocity v is given by:

v = distance / time.

Now you can write an equation for the time difference t and use the two velocities and the 90 min(= 1.5h) she stays:

3 = s/12 + 1.5 + s/2.3

Solve this equation for s:

(1/12 + 10/23)* s = 1.5

s = 2.9

7 0
3 years ago
Can some please answer these for me!!? ​
aivan3 [116]

Answer:

- Right Angle Triangle – A Right triangle is a triangle in which one angle is a right angle (that is, a 90-degree angle). The relation between the sides and angles of a right triangle is the basis for trigonometry (opposite, hypotenuse, adjacent).

- Obtuse Triangle – An obtuse triangle is a triangle with one obtuse angle (greater than 90°) and two acute angles.

- Acute Triangle – An acute triangle is a triangle with three acute angles (less than 90°).  

12 - Right Angle Triangle

13 - Obtuse Triangle

14 - Acute Triangle

15 - Acute Triangle

16 - Right Angle Triangle

17 - Obtuse Triangle

3 0
2 years ago
Other questions:
  • Which linear equation has no solution? 23(9x+6)=6x+4
    6·1 answer
  • -2- 5/4x =13 can someone pls help me!!!
    13·1 answer
  • Kind of struggling, can anyone help?
    12·1 answer
  • What’s the area of the triangle shown below
    6·2 answers
  • What does more than mean in math add or subtract
    12·1 answer
  • WILL GIVE BRAINLIST!!!!!!!<br><br>FACTOR THIS COMPLETELY <br><br> 4x^2 − 25
    6·1 answer
  • Two neighbors in a rural area want to know the dsitance between their homes in miles what should the mneighbors us as a conversi
    5·1 answer
  • Which equation shows that 5 is a factor of 45?
    9·1 answer
  • An unknown number x is at most 20. Which graph best represents all the values of x?
    10·1 answer
  • PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU B
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!