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2 years ago

Which of the following is a key element in the proof of the law of cosines?

2 answers:

4 0

The best and most correct answer among the choices provided by the question is the fourth choice "d=square root of (x^2+x^1)+(y^2-y^1)^2"
The law of cosines for calculating one side of a triangle when the angle opposite and the other two sides are known. Can be used in conjunction with the law of sines to find all sides and angles. 

I hope my answer has come to your help. God bless and have a nice day ahead!

Vikentia [17]2 years ago

4 0

The correct answer is:

D) d=√((x+x¹)+(y²-y¹)² )

Explanation:

The distance formula is a key component to the proof of the law of cosines.

First we define sin θ = y/b and cos θ = x/b, using the standard law of cosines diagram.

We then use the distance formula, replacing the second y coordinate with 0 and the second x coordinate with a.

We then substitute our values for sin θ and cos θ, square them and simplify.

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In a certain county, the number of Charter Schools is eleven less than twice the number of Alternative Schools. There are 35 Cha

vitfil [10]

Id have to say 2a-11=35

5 0

3 years ago

Finding the roots (zeros)

GenaCL600 [577]

Answer:

1.5 + 1.3228756555323i

1.5 - 1.3228756555323i

Step-by-step explanation:

y = ax^2 + bx + c

a = 1, b = -3, c = 4

Using the quadractic formula:

$\frac{-b±\sqrt{b^2-4ac} }{2a} \\\\= \frac{3±\sqrt{9-4(1)(4)}}{2(1)}\\\\= \frac{3±2.64i}{2}\\\\= 1.5 ± 1.32$

Note: Kindly ignore the A in the above solution ^

Hence, there is no real solution. It has complex roots.

Feel free to mark this as brainliest! :D

4 0

2 years ago

What is 2 5/8 x 2/5

elena-14-01-66 [18.8K]

Answer:1 1/20

Step-by-step explanation:

2 5/8 x 2/5

(8x2+5)/8 x 2/5

21/8 x 2/5

(21 x 2) ➗ (8 x 5)

42 ➗ 40

42/40=21/20=1 1/20

4 0

2 years ago

Len and Faye live 54 miles apart. At the same time, they start biking toward each other on the same road. Len's constant rate is

Aloiza [94]

Answer:

Step-by-step explanation:

Len and Faye live 54 miles apart. At the same time, they start biking toward each other on the same road. Len's constant rate is 7 mph and Faye's is 11 mph. How many hours will it take them to meet? [Remember: D = (r)(t)]

Answer – 3 hours

D = (r)(t), Where

‘D’ is the distance covered

‘r’ is the approach rate

‘t’ is the total time spent

Distance covered, ‘D’ = miles

Approach rate, “r” = mph + mph 7+11

r = 18

t is unknown

Solving for t,

D = (r)(t)

54 = 18t

t = 54/18

t = 3 hours

5 0

3 years ago

Read 2 more answers

An unknown number w is 30 more than an unknown number p. The number w is also p less than 5. The equations to find p and w are s

puteri [66]

The given equations are

$w = p+30 \\ w = -p+5$

TO solve for p and w, we can use elimination method. And the first step is to eliminate p by adding both equations .

So out of the given options, correct option is the first option .

7 0

3 years ago

Read 2 more answers