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Eddi Din [679]
3 years ago
13

How to find x with cosine law?

Mathematics
1 answer:
Kryger [21]3 years ago
5 0

Answer:


Step-by-step explanation:

How can you remember the formula?


Well, it helps to know it's the Pythagoras Theorem with something extra so it works for all triangles:


Pythagoras Theorem:

(only for Right-Angled Triangles) a2 + b2 = c2

Law of Cosines:

(for all triangles) a2 + b2 − 2ab cos(C) = c2

So, to remember it:


think "abc": a2 + b2 = c2,

then a 2nd "abc": 2ab cos(C),

and put them together: a2 + b2 − 2ab cos(C) = c2


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14. A salad recipe that serves 10 people requires 1 1/2 cups of celery. To serve 5 people, the amount
Dimas [21]

Answer:

3/4 cups

Step-by-step explanation:

10 people = 1 1/2 cups

Changing to a mixed number

10 people = 3/2 cups

Divide by 2

10/2 people = 3/2*1/2

5 people = 3/4 cups

5 0
3 years ago
Needing Answers! Thanks!
kari74 [83]

Answer:

1: 4 1/2 hrs. | 2: 16 | 3: yes

Step-by-step explanation:

1: 1.5 x 3 = 4.5 = 4 1/2

2: 24 ÷ 3 = 8 24 - 8 = 16

3: 16 x 5.5 = 88

hope this helps :)

5 0
3 years ago
Read 2 more answers
Solve by using the quadratic form<br> 5r^2-8r+20=0
nevsk [136]

Answer:

Step-by-step explanation:

3 0
3 years ago
75 girls at a summer camp were asked to complete a survey about their favorite outdoor activity. 27 girls chose swimming and 32
Oduvanchick [21]

ANSWER

Find out the expression gives the percent of survey participants who chose swimming.

To proof

As given

75 girls at a summer camp were asked to complete a survey about their favorite outdoor activity.

27 girls chose swimming

32 girls chose hiking.

FORMULA

Percentage = \frac{Part\times100}{whole}

total girls  = 75

girls chose swimming = 27

put in the formula

= \frac{27\times100}{75}

= 36%

36% of survey participants who chose swimming

Hence proved

3 0
3 years ago
Read 2 more answers
The question is: "Without actually graphing, describe how the graph of y = ( -2^(x+17) ) - 4.3 is related to the graph of y = 2^
Leokris [45]

Answer:

The function has been flipped due to the negative in front.

The function has been shifted 17 units to the left.

The function has been shifted 4.3 units down.

Step-by-step explanation:

When functions are transformed there are a few simple rules:


  • Adding/subtracting inside the parenthesis to the input shifts the function left(+) and right(-).
  • Adding/subtracting outside the parenthesis to the output shifts the function up(+) and down(-).
  • Multiplying the function by a number less than 1 compresses it towards the x-axis.
  • Multiplying the function by a number greater than 1 stretches it away from the x-axis.
  • Multiplying by a negative flips the graph.

The graph of (-2^{x+17}) -4.3 compares to 2^x in the following ways:

The function has been flipped due to the negative in front.

The function has been shifted 17 units to the left.

The function has been shifted 4.3 units down.

4 0
4 years ago
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