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
KIM [24]
3 years ago
11

Can it figure how to do this cosine out

Mathematics
1 answer:
Gnesinka [82]3 years ago
3 0

Answer:

  BC= 14.6

Step-by-step explanation:

The law of cosines tells you ...

  BC² = AB² +AC² -2·AB·AC·cos(A)

  BC² = 9² +12² -2·9·12·cos(87°) ≈ 213.695

  BC ≈√213.695 ≈ 14.6

The length of BC is about 14.6 units.

You might be interested in
What is the missing<br> symbol (?) to make<br> this true?<br> 54 + 24 ? 23 – 30 = 32
Aloiza [94]

The division ➗ ÷ sign will make the expression correct if you correct the question!

5 0
3 years ago
Jordan surveyed her friends about whether or not they had a minivan and whether or not they lived in a two-story house. She repo
Anarel [89]

Its D It is least likely that one of her friends does not have a minivan and does not live in a two story house.

5 0
3 years ago
Read 2 more answers
Triangle ABC
Virty [35]

Answer:

15 cm

Step-by-step explanation:

Similar triangles are triangles which have the same shape but not the same size. This means their angle measures are equal but their side lengths are not instead they are proportional. To solve, we will set up a proportion and solve.

A proportion is two equal ratios set equal to each other. We form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). Out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

\frac{BC}{EF} =\frac{AC}{DF}.

\frac{18}{x}=\frac{12}{10}

To solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

\frac{18}{x}=\frac{12}{10}\\ 18*10 = x*12 \\ 180 = 12x \\ 15 = x

5 0
3 years ago
What value should be added to the expression to create a perfect square? x^2 - 20x
boyakko [2]
To complete the square:
we take the coefficient ox "x" (which in this problem is -20)
we divide it by 2
square that number
then add it to both sides of the equation

-20 / 2 = -10
-10^2 = 100
then we add 100 to both sides of the equation:
x^2 -20x
x^2 -20x +100 = 100
******************************************************
To get the roots of the equation, we take the square root of both sides:
(x -10) * (x-10) = 10
(x-10) = square root (10)
x-10 = <span> <span> <span> 3.1622776602 </span> </span> </span>
x1 = <span> <span> <span> 13.1622776602 </span>
and don't forget that square root of 10 also equals  </span></span><span><span><span> -3.1622776602 </span> </span> </span>
x2 = 10 -<span> <span> <span> 3.1622776602
x2 = </span></span></span> <span> <span> <span> 6.8377223398 </span> </span> </span>


4 0
3 years ago
Please help! Basic math.
zlopas [31]

Answer:

A' = 2,-2

B' = 2,-4

C' = 5,-4

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • A multiple choice question has four answers. If you guess, what is the probability of guess the correct answer
    14·2 answers
  • Frank bought 70 CDs at $16 each. How much did he pay in total?
    13·1 answer
  • Write out the sample space for the given experiment. Use the following letters to indicate each choice: W for white, Y for yello
    13·1 answer
  • Find the value of x ​
    7·2 answers
  • A bucket of candy contains 24 Jolly Ranchers, 18 Hershey Kisses, 12 packs of Smarties, and some Starburst. The probability of re
    9·1 answer
  • Please help ive been stuck!!
    14·1 answer
  • What is the correct order to represent 92,232
    12·1 answer
  • Help it’s not 1,134 will give brainly
    9·2 answers
  • 0.175 as a percentage
    6·2 answers
  • What is the value of y
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!