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
gayaneshka [121]
3 years ago
10

HELP!! TRIG LAW OF COSINES

Mathematics
1 answer:
vivado [14]3 years ago
4 0

Answer:

C ≈ 95.7°

Step-by-step explanation:

Law of cosines:

c² = a² + b² − 2ab cos C

where a, b, and c are the sides of the triangle, and C is the angle opposite of side c.

9² = 5² + 7² − 2(5)(7) cos C

81 = 25 + 49 − 70 cos C

81 = 25 + 49 − 70 cos C

7 = -70 cos C

-1/10 = cos C

C ≈ 95.7°

You might be interested in
Which pair represents equivalent ratios?
TEA [102]

Answer:

D

Step-by-step explanation:

We can test each pair making each ratio into its simplest form.

For A 2/3 is already in its simplest form and 9/15=3/5. they are not equivalent.

For B, 5/8 is already in its simplest form and 15/21=5/7. they are not equivalent.

For C, 3/12=1/4, and 6/18=1/3. They are not equivalent.

For D, 4/10=2/5, and 12/30=2/5. They are equivalent.

5 0
1 year ago
Read 2 more answers
Write the number 3.7 as a mixed number let x
puteri [66]
3.7/1 = 3.7

multiply it through to make it a whole number.
x 10

37
_
10

then see how mant times 10 goes into it.
3 times. so 3 is your whole number. 7/10 remains.
that is your fraction.

4 0
2 years ago
A sum of money doubles itself in 16 2 years at certain rate of simple interest. How long will it take to double itself at the sa
Viefleur [7K]

Answer:

r=40% or .4

Step-by-step explanation:

32=16(1+r)^2

6 0
3 years ago
Mario says that the expression 4+3n² has four terms: 4, 3, n, and 2. Is he correct? explain.
stich3 [128]

Mario says that the expression 4+3n^2 has four terms: 4, 3, n, and 2. Mario is incorrect

<em><u>Solution:</u></em>

Given that the expression is:

4+3n^2

Given that, Mario says that the above expression has four terms

But Mraio is incorrect

Because the given expression has two terms only

4 is one of the term

3n^2 is another term

So there are totally 2 terms only

A term can be a signed number, a variable, or a constant multiplied by a variable or variables

Here 3 is a constant multiplied by n^2

So, 3n^2 is one term

Each term in an algebraic expression is separated by a + sign or - sign

Thus there are two terms in mario expression

8 0
2 years ago
In preparation for the Maths festival you are asked to work out how much water the drinks area will need for the event. The aren
Tresset [83]
Total liters of water needed = number of attendee x water                            consumption/attendee wherenumber of attendee = 7000 attendeewater consumption/attendee = 0.5litre of water/attendeetotal = 7000 x 0.5 litre        = 3500 litrescomputing the water requirement per 200 litre containerwater requirement in the event = 3500 litres/200 litre /container                                                  = 17.5 containersThe water requirement in the event at the arena of 7000 attendees is 17.5 containers. 
3 0
3 years ago
Other questions:
  • What is the equation of the line in slope-intercept form?
    7·1 answer
  • Sarah predicts that 15 percent of all the birds she spots while bird watching will be robins. At the end of the day, she records
    12·1 answer
  • This isn't an important question, so if you have other questions to answer move on.
    6·1 answer
  • Which statement best describes the association between variable X and variable Y?
    8·2 answers
  • (19+2x)–(5x–11)=25 HELP
    8·2 answers
  • Lana is planting a garden that is going to have an area of 432 square feet. She wants the length of the garden to be 3 times the
    14·1 answer
  • Quadrilateral ABCD is inscribed. The measure of ZA = 67º. What is the measure of ZC?
    11·1 answer
  • 3. A rectangular prism has dimensions of 1/2 , 2, and 7/2 in.
    6·1 answer
  • Find the length of the missing side. the triangle is not drawn to scale. 6, 8, 90
    12·2 answers
  • Help me please<br><br> Solve the inequality s:<br><br> 5s+2&gt;7
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!