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
Over [174]
2 years ago
9

1) How many triangles will be formed by 13 matchsticks?

Mathematics
1 answer:
krek1111 [17]2 years ago
3 0
1) 4 and one extra

2) 21
You might be interested in
Use the linear combination method to solve the system of equations. Explain each step of your solution. 2x-3y=13 4x-y=-9
Tems11 [23]

2x -3y = 13

4x -y = -9

Multiply the second equation by -3 to make the coefficient of Y opposite the first equation.

4x -y = -9 x -3 = -12x + 3y = 27

Now add this to the first equation:

2x -12x = -10x

-3y +3y = 0

13 +27 = 40

Now you have :

-10x = 40

Divide each side by -10:

x = 40 / -10

x = -4

Now you have a value for x, replace that into the first equation and solve for y:

2(-4) - 3y = 13

-8 - 3y = 13

Add 8 to both sides:

-3y = 21

Divide both sides by -3:

y = 21/-3

y = -7

Now you have X = -4 and y = -7

(-4,-7)

3 0
3 years ago
[Accessibility Mode
Hatshy [7]

Answer:

91 Adults

Step-by-step explanation:

Because there are 26 children, you divide it by 2 to get 13. Multiply 13 by 7 for your answer, 91

6 0
2 years ago
A guy wire runs from the top of a cell tower to a metal stake in the ground. Marques places a 11-foot tall pole to support the g
astra-53 [7]

The Pythagorean theorem computed shows that the length of the guy wire, to the nearest foot, is 207 ft.

<h3>How to solve the length?</h3>

Here, we have two similar right triangles, ΔABE and ΔCDE.

CD = 11 ft

DE = 2 ft

BD = 35 ft

First, find AB:

AB/11 = (35 + 2)/2

AB/11 = 37/2

Cross multiply

AB = (37 × 11)/2

AB = 203.5 ft

Then, apply Pythagorean Theorem to find AE:

AE = √(AB² + BE²)

AE = √(203.5² + 37²)

AE = 207 ft

Therefore, the length of the guy wire is 207 ft.

Learn more about Pythagorean theorem on:

brainly.com/question/654982

5 0
2 years ago
Descriptive statistics ___________, while inferential statistics ______________. are measures of central tendency; are measures
Leviafan [203]

Answer:

Descriptive statistics <u>describe data from surveys and case studies,</u> while inferential statistics <u>determine if data can be generalized to other populations</u>.

Step-by-step explanation:

Let's look at the definition of each type of Statistics

Descriptive Statistics, as the name says, describes, properties or characteristics (that can be gathered through surveys and case studies), using mathematical methods for tendency and dispersion.

Inferential statistics, as the name states, infers, if samples from a larger data set have behaviors that can be then extrapolated to the larger group.

8 0
3 years ago
A life insurance company is offering Anna a $100,000 life insurance policy for
Fynjy0 [20]
Excellent 43.0000
Answer 8747744748848833773737374758
6 0
3 years ago
Other questions:
  • What is 10097×34565632
    12·2 answers
  • What is the term and definition for coordinate plane​
    9·1 answer
  • #3
    11·1 answer
  • , list the first five terms of each sequence, and identify them as arithmetic or geometric.
    8·1 answer
  • QF Q2.) Solve the triangle.
    14·2 answers
  • Any1 know the answers for this?
    9·1 answer
  • What property is illustrated in the equation 15•1=15
    15·2 answers
  • Help me please tomorrow there is my exam​
    9·1 answer
  • Any two points in space lie on one and only one _____.
    13·1 answer
  • 8x = 72 Is this nine?? ​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!