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
katrin2010 [14]
3 years ago
12

How can I solve this question???

Mathematics
1 answer:
eduard3 years ago
5 0

Answer:

144°

Step-by-step explanation:

step 1

Find the measure of the central angle of the regular pentagon

Divide 360 degrees by 5 (the number of sides)

360\°/5=72\°

Let

c----> the center of the pentagon

we know that

m∠ECA=72°

m∠ACB=72°

therefore

m∠ECB=m∠ECA+m∠ACB

substitute the values

m∠ECB=72°+72°=144°

The measure of angle ECB is equal to the degrees that the pentagon rotate

You might be interested in
If discriminant is zero, how many solutions do I have?
kap26 [50]
You would have one repeating real solution.
3 0
3 years ago
Please please please please help
satela [25.4K]

Answer:

The answer to your question is option 3) 93,000,000 miles

5 0
2 years ago
The formula that relates the length of a ladder, L, that leans against a wall with distance d from the base of the wall and the
anygoal [31]

Answer:

<u>The correct answer is C. 14.6 feet</u>

Step-by-step explanation:

Information given to solve the case:

Length of the ladder = 15 feet

Distance from the base of the wall = 3.5 feet

Using the Pythagorean theorem for finding the height, because this is a right triangle:

h² = Length of the ladder ² - Distance from the base of the wall ²

h² = 15 ²  - 3.5 ²

h² = 225  - 12.25

h² = 212.75

h = √ 212.75

h = 14.59

<u>h = 14.6 feet (Rounding to one decimal place)</u>

4 0
3 years ago
Read 2 more answers
1y
BabaBlast [244]

I don't have gotten any answer of this question

3 0
3 years ago
Iodine-125 has a half-life of about 60 days. How many milligrams of a 500 mg sample will remain after 300 days?
just olya [345]

60 x 5 = 300 days

So five half-lifes = 300 days

Starting amount = 500mg

<span>Amount after 1st half-life = 250 mg</span>

<span>Amount after 2nd half-life = 125 mg</span>

<span>Amount after 3rd half-life = 62.5 mg</span>

<span>Amount after 4th half-life = 31.25 mg</span>

<span>Amount after 5th half-life = 15.625 mg</span>

<span>Hence after 300 days, the amount of iodine-125 will be 15.625 mg out of 500 mg.</span>

4 0
3 years ago
Read 2 more answers
Other questions:
  • 6x2(3x) simplify this expression
    5·1 answer
  • As an estimation we are told 5 miles is 8 km. <br> Convert 27.4 miles to km.
    10·2 answers
  • The symphonic band is having their annual winter performance the equation 2 a + 5s= 41 represents money collected on the first n
    9·1 answer
  • How wide is a rectangular strip of land with the length 3/4 mile and area 1/2 square mile?
    8·2 answers
  • Give the prime factorization of the number. use exponents when possible <br> 126
    14·1 answer
  • Simplify the problem given.<br><br> 9/6 - x/4 - 2/8
    6·2 answers
  • An Epson inkjet printer ad advertises that the black ink cartridge will provide enough ink for an average of 245 pages. Assume t
    8·1 answer
  • (Trigonometry question)
    6·2 answers
  • What is the end behavior of this function?<br> As X → + then y →<br> As X1-00 then y →
    6·1 answer
  • trans.phobic, homo.phobic, white and thinks you can be rac.ist to white people, also says the r sl.ur what else can you do wrong
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!