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
NikAS [45]
3 years ago
12

Answer with explanation will mark brainliest for best response

Mathematics
2 answers:
Elina [12.6K]3 years ago
7 0

Answer:

Angle B = 106.6 degrees

Step-by-step explanation:

b^2= a^2+c^2-2*a*c*cosB

9*9 = 4*4 + 7*7 - 2*7*4*cosB

81= 16+49-56cosB           Subtract 16 and 49 from both sides

16= -56cosB           Divide by -56 on both sides.

cosB= -16/56         Take the arccosine of both sides

B=arccos(-16/56)                    

B= 106.6

Zolol [24]3 years ago
4 0

Answer:

B. 106.6

Step-by-step explanation:

To solve for angle B, we can use the law of cosines.

Recall that the law of cosines states b^2=a^2+c^2-2ab*cos(B)

When this is solved for angle B, we get B=cos^{-1}( \frac{a^2+c^2-b^2}{2ac} )

In this triangle, a=7, b=9, c=4

Now, we can plug these numbers into our equation and then simplify to get B.

B=cos^{-1}( \frac{7^2+4^2-9^2}{2(7)(4)} )\\\\B=cos^{-1}( \frac{49+16-81}{56} )\\\\B=cos^{-1} (\frac{-16}{56} )\\\\B=106.602\\\\B=106.6

You might be interested in
Question 31 only please
Brut [27]

Answer:

this is answer

........☺️☺️☺️☺️☺️☺️☺️

3 0
3 years ago
I need the answer plzz now
Verizon [17]

Answer:

Ea and St

Step-by-step explanation:

6 0
3 years ago
Whats a square + b square I don't know thats why I am asking u dude
murzikaleks [220]

Answer:

.............................

8 0
2 years ago
The ratio of apples to orgens is 1 to 3
-BARSIC- [3]
Because the ratio is 1 to 3. It means that For every one apple there are 3 oranges. So If there are 2 apples, there would n 6 oranges. If there are twelve apples, there would be 36 oranges. To find the number of oranges for the amount of apples, just multiply the number of apples by 3.
8 0
3 years ago
Determine if the sequence below is arithmetic or geometric and determine the common difference / ratio in simplest form. 4, 12,
Sedaia [141]

Answer:

geometric (so it's a 1:3 ratio I believe)

Step-by-step explanation:

you're multiplying by 3 each time

8 0
3 years ago
Other questions:
  • 24x4y/3x-4y-1<br><br> simplest form
    7·2 answers
  • HELP!! PLEASE!!!!! NOW!!! ASAP!!!!!
    7·2 answers
  • Help me on these mathematics questions please?
    7·2 answers
  • Express this number in scientific notation.<br> 78 million
    6·2 answers
  • ASAP HELP NOW If f(x) = 3x – 2 find the value for: f(4)
    13·2 answers
  • Y+4= 2/3 (x+3) written in standard form​
    6·2 answers
  • Rolly's bicycle wheel has a diameter of 75 cm. What is the circumference of the wheel?
    9·1 answer
  • Which of the following expressions is equal to 6^4
    5·2 answers
  • PLEASE HELPPPP :(((((((((((​
    10·2 answers
  • C.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!