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
Jayden and Caden share a reward of 140 in a ratio of 2: 5. What fraction of the total reward does Jaden get?
zysi [14]
Jaden gets 40, Caden gets 100
5 0
3 years ago
Read 2 more answers
HELP ASAP<br> What is the solution to the system of equations?<br> y = x + 3<br><br> y = -x-1
ASHA 777 [7]

Answer:

(A) Is right

Step-by-step explanation:

y = x + 3 \\ y =  - x - 1 \\ substitute \: y =  - x - 1 \: in \: above \: eq \\ weget \\  - x - 1 =  x + 3 \\ 2x =  - 4\\ x =  - 2 \\  \\

put X= -2. in y = X+3

to get y 's value

Y = -2+3

= 1

therefore, your solution is ( -2,1)

5 0
3 years ago
Eddie is finding how many 1-cm cubes will fit into a rectangular prism
Zarrin [17]
I believe that the correct newer would actually be the last option. By this Eddie person finding the length of the cube, the small cube, as also the cube which is the bigger one, if we were just to find the length and just add them all up, we would then find how many would then fit.
3 0
3 years ago
Can someone plz help Me?
belka [17]

Answer:

i am pretty sure its C

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
PLEASE ANSWER QUICK One year, the population of a city was 164,000. Several years later it was 182,040. Find the percent increas
Katena32 [7]

Answer:

There was an 11% increase.

Step-by-step explanation:

The formula to find a percent increase is this: (original amount - new amount / original amount) * 100

If you fill in the formula, you get this:

(164,000 - 182,040 / 164,000) * 100

Solve:

(-18,040 / 164,000) * 100 ---> If the number being divided is negative, find the absolute value.

(18,040 / 164,000) * 100 =

0.11 * 100

11%

5 0
3 years ago
Other questions:
  • Beginning with January, Connie kept track of the number of books she read each month for six months. By March, she had read a to
    12·2 answers
  • -3x + y + 8 - 5y + 7x
    11·2 answers
  • What is this one..?
    7·1 answer
  • Which of the binomal below is a factor of this trinomal x^2+7x+44
    12·1 answer
  • Your percent grade varies directly with the number of correct answers. You got a
    13·2 answers
  • What are the first five common multiples of 9 and 10?
    5·1 answer
  • Draw the line that is parallel to y = 2x + 5 and passes
    10·2 answers
  • Which graph shows an odd function?
    14·2 answers
  • Alvin’s first step in solving the given system of equations is to multiply the first equation by 2 and the second equation by –3
    13·2 answers
  • The Chen family drove 345.6 miles on their vacation. They drove the same amount each day of the the 3 days. How many miles did t
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!