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
ryzh [129]
3 years ago
12

What is the area of triangle ABC?

Mathematics
1 answer:
Stella [2.4K]3 years ago
7 0

9514 1404 393

Answer:

  C.  36√3 square units

Step-by-step explanation:

Your knowledge of special triangles tells you that height CD is ...

  CD = 6√3

so the area is ...

  A = 1/2bh

  A = 1/2(12)(6√3) = 36√3 . . . . square units

_____

<em>Additional comment</em>

The 30°-60°-90° right triangle that is half an equilateral triangle has a short side equal to half the length of the long side. The Pythagorean theorem tells you that the middle-length side is √(2²-1²) = √3 times the shortest side. That is, the side length ratios in this "special" triangle are ...

  1 : √3 : 2

This means the length DB is 12/2 = 6, and the length CD is 6√3.

You might be interested in
You conduct a simulation regarding which team spectators at a football game support. Your null hypothesis is that there are equa
Llana [10]

Answer:

As the <em>p</em>-value is too small the null hypothesis will be rejected concluding that there is a higher proportion of people supporting the home team.

Step-by-step explanation:

The hypothesis to determine which team spectators at a football game support is:

<em>H₀</em>: There are equal proportions of people supporting the home team and the visiting team, i.e. <em>p</em>₁ = <em>p</em>₂.

<em>Hₐ</em>: There is a higher proportion of people supporting the home team than the visiting team, i.e. <em>p</em>₁ > <em>p</em>₂.

A <em>z</em>-test for difference between proportions can be used to perform the test.

The test statistic is:

z=\frac{\hat p_{1}-\hat p_{2}}{\sqrt{P(1-P)\frac{1}{n_{1}}+\frac{1}{n_{2}}}}}

Th decision rule is:

If the <em>p</em>-value of the test is less than the significance level <em>α </em>then the null hypothesis will be rejected and vice-versa.

The commonly used significance levels are 0.01, 0.05 and 0.10.

The <em>p</em>-value of the test is computed as, <em>p</em> = 0.002.

The <em>p</em>-value of the test is less than all the significance level.

Thus, the null hypothesis will be rejected at any of the three significance level.

Conclusion:

As the <em>p</em>-value is too small the null hypothesis will be rejected concluding that there is a higher proportion of people supporting the home team.

7 0
4 years ago
Simplify the expression x^5 •x^7
Alik [6]

Answer:

{x}^{12}

Step-by-step explanation:

x^5 •x^7 =  {x}^{5 + 7}  =  {x}^{12}  \\

5 0
3 years ago
Read 2 more answers
original price 189 sale 55% off discount what is the sale price what is it sale tax 4.2% what is the total
aliina [53]

Answer:


Step-by-step explanation:


3 0
3 years ago
Evaluate the expression 4x^3 for each value of x<br> 1 2, and 1/2<br> help me, plz
almond37 [142]

Answer:

67

Step-by-step explanation:

4 0
3 years ago
Screen-printing a batch of shirts requires 2 minutes per shirt in addition to 4 minutes of initial set-up time. If it takes 80 m
Lelu [443]

38 is the correct answer because 80-4=76 then divide that by 76/2 give you 38

7 0
3 years ago
Other questions:
  • Insert the parentheses in expression 2 so that it has a value of 19.
    7·1 answer
  • Show a number line 2/3 3/3
    13·1 answer
  • If you have 100 footballs 30 soccer balls 16 softballs 300 tennis balls in a room full of 5 guys how many balls do you have?
    12·1 answer
  • The radius of a circle is 63 centimeters. what is the circumference of the circle?
    14·1 answer
  • A football team has a net yardage of -33 yards on a series of plays. The team needs a net yardage of 10
    11·1 answer
  • What is the value of k?<br>​
    10·1 answer
  • 18 increased by twice a number​
    8·2 answers
  • Write an equation of the line that passes through point (-8, – 5) and has the slope m= - 1/4 <br>y=
    11·1 answer
  • A gift box in the shape of a
    8·2 answers
  • Estimate the value of √15 to the nearest tenth.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!