Use the law of cosines to find the missing third side

Use The Law Of Cosines To Find The Missing Third Side

Answers

Answer 1
a^2=b^2+c^2-2bccosA

a^2=7.4^2+15.8^2-2(7.4)(15.8)cos54°

a^2=304.4-233.84cos54°

a=√(304.4-233.84cos54°) units

a≈12.92 units (to the nearest hundredth of a unit)


Answer 2

The missing third side BC is approximately 16.93 units. To use the Law of Cosines to find the missing third side (BC), we'll use the formula:

[tex]c^2 = a^2 + b^2 - 2ab * cos(C)[/tex]

where:

c is the side opposite angle C (BC in this case)

a and b are the known sides (AC and AB, respectively)

C is the angle opposite side c (angle BAC in this case)

Given values:

Angle BAC (C) = 54 degrees

AC (a) = 7.4

AB (b) = 15.8

Now, we can plug the values into the formula and solve for BC (c):

[tex]BC^2 = 7.4^2 + 15.8^2 - 2 * 7.4 * 15.8 * cos(54)[/tex]

To find cos(54), we can use a calculator:

[tex]cos(54 degrees) \approx 0.5878[/tex]

Now, we can continue the calculation:

[tex]BC^2 = 54.76 + 249.64 - 2 * 7.4 * 15.8 * 0.5878\\BC^2 = 54.76 + 249.64 - 17.44\\BC^2 = 286.96[/tex]

Now, find the square root of both sides to get the value of BC:

[tex]BC = \sqrt{286.96} \\BC \approx 16.93[/tex]

So, the missing third side BC is approximately 16.93 units.

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Related Questions

What's the verbal expression for the algebraic expression 15+r ?

Answers

You have the constant 15 added to the variable r.

So, it would be read as "15 plus r".

What value of x makes the denominator of the function equal zero?y=(7)/(5x-25)A.0.2 B.–0.2 C.5 D.–5

Answers

The denominator is 5x-25, and we wish to know when it is equal to zero so:

5x-25=0  factor out 5

5(x-5)=0

x=5
X would just equal 5
:)

please HJelp QUICKLY

Answers

Along the x axis:
5 - 3 = 2 blocks

Along the y axis:
8 - 1 = 7 blocks

Total:
2 + 7 = 9 blocks

HELP ME PLEASE I NEED AN ANSWER I'LL PICK A BRAINLIEST PERSON!!!

A science test, which is worth 100 points, consists of 24 questions. Each question is worth either 3 points or 5 points. If x is the number of 3-point questions and y is the number of 5-point questions, the system shown represents this situation.

x + y = 24

3x + 5y = 100

What does the solution of this system indicate about the questions on the test?

A.)The test contains 4 three-point questions and 20 five-point questions.
B.)The test contains 10 three-point questions and 14 five-point questions.
C.)The test contains 14 three-point questions and 10 five-point questions.
D.)The test contains 20 three-point questions and 8 five-point questions.

Answers

After you solve it you get B

x + y = 24....multiply by -3
3x + 5y = 100
---------------
-3x - 3y = - 72 (result of multiplying by -3)
3x + 5y = 100
--------------add
2y = 28
y = 28/2
y = 14

x + y = 24
x + 14 = 24
x = 24 - 14
x = 10

solution is (10,14)...and x represents 3 point q's and y represents 5 point q's......so this tells me there are 10 three point q's and 14 five point q's.

HELP NEEDED!!
Calculate the side lengths a and b to two decimal places.
A. a = 16.23 and b = 17.99
B. a = 16.23 and b = 18.83
C. a = 17.99 and b = 16.23
D. a = 4.81 and b = 5.33
E. a = 5.33 and b = 4.81
Will thank rate five stars and give brainlist anser to first person to answer!

Answers

What answer did u get to this problem

Answer:

A. a = 16.23 and b = 17.99

Step-by-step explanation:

The addition of the three angles of the triangle is equal to 180°. So,

C + 64° + 85° = 180°

C =  180° - 64° - 85°

C = 31°

The law of sine states:

sin(A)/a = sin(B)/b = sin(C)/c

where c is the side opposite to angle C

Taking angles A and C, and sides a and c, we get

sin(A)/a = sin(C)/c

sin(64°)/a = sin(31°)/9.3

sin(64°)*9.3/sin(31°) = a

a = 16.23

Taking angles B and C, and sides b and c, we get

sin(B)/b = sin(C)/c

sin(85°)/b = sin(31°)/9.3

sin(85°)*9.3/sin(31°) = b

b = 17.99

The map shows the location of the airport and a warehouse in a city. Though not displayed on the map, there is also a factory 64 miles due north of the warehouse.




A truck traveled from the warehouse to the airport and then to the factory. What is the total number of miles the truck traveled?

48 miles
56 miles
104 miles
128 miles

Answers

warehouse location (24,-32)

airport location (-24,32)

 distance = sqrt((x2-x1)^2 +(y2-y1)^2)=

Sqrt(24--24)62 +(32--32)^2) =

sqrt(48^2 +64^2) =80

then distance from airport to the factory = -24 to 24 = 48

80+48 = 128 miles total

An arc with a length of 12 cm lies on a circle with a diameter of 9cm

What is the length of the arc in radians?

A. About 1.3 radians
B. About 1.9 radians
C. About 2.2 radians
D. About 2.7 radians

Answers

Circumference is given by:
C=Θ/360πd
C=12 cm
d=9cm
thus;
12=Θ/360*π*9
12=0.0785Θ
Θ=12/0.0785
Θ=152.789
thus the angle in radians will be:
radians=(π/180)*degrees
=π/180*152.789
=2.6667
=2.7 radians
the answer is D]

The equation a=640s gives the relationship between s square miles and acres. Pam owns 7.5 square miles of farmland. How many acres does she own

Answers

640 acres / 1 mi^2 

7.5 mi^2 (640 acres / 1 mi^2) 

= 4,800 acres 

Answer:

4800 acres.

Step-by-step explanation:

We have been given an equation [tex]a=640s[/tex], which gives the relationship between s square miles and acres.

To find the number of acres Pam owns we will substitute [tex]s=7.5[/tex] in our given equation.

[tex]a=640\times 7.5[/tex]

[tex]a=4800[/tex]

Therefore, Pam owns 4800 acres.

Which algebraic expression represents “the difference of fifty-four and seven times a number”?

Answers

Answer:

The difference of fifty-four and seven times a number is written as 54 - 7x.

Step-by-step explanation:

Given: expression “the difference of fifty-four and seven times a number”

We have to write the given algebraic expression represents “the difference of fifty-four and seven times a number”

Consider the given algebraic expression represents “the difference of fifty-four and seven times a number”

Let the number be x

Then, seven times a number is 7x

And the difference of fifty-four and seven times a number is written as 54 - 7x.

Thus, The difference of fifty-four and seven times a number is written as 54 - 7x.

Answer:

a

Step-by-step explanation:

Solve for a:
3/5a = 1/4

Answers

3/5a = 1/4....multiply both sides by 5/3, cancelling out the 3/5 on the left
a = 1/4 * 5/3
a = 5/12
3a/5=1/4  multiply both sides by 5

3a=5/4  divide both sides by 3

a=5/12


1. What shape is the graph?
2. What direction does the graph open?
3. Where is the graph increasing/decreasing?
4. What are the intercepts?
5. Are there any special points?
6. Is there a line of symmetry?

Answers

1. Triangular, 2. Upwards, 3. (- ∞, 3),(3, ∞), 4. (-1, 0) and (-3, 0), and (0, 1),

5.  (-3, -1), 6. symmetry is along the x-axis.

What is a graph?

The set of ordered pairings (x, y) where f(x) = y makes up the graph of a function.

These pairs are Cartesian coordinates of points in two-dimensional space and so constitute a subset of this plane in the general case when f(x) are real values.

Given, A modulus function | x + 2 | - 1.

The shape of the graph is triangular.

The graph opens in the upwards direction positive y-axis.

The graph is decreasing at the interval (- ∞, 3) and it is increasing at an interval (3, ∞).

The x-intercepts of the graph is (-1, 0) and (-3, 0), and The y-intercepts of the graph is (0, 1).

The special point of the graph is (-3, -1) where the graph is increasing from decreasing.

Yes, the line of symmetry is along the x-axis.

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What is the height of an airplane as it descends to an airport runway

Answers

The set of Real numbers consists of following sets:
- Rational numbers,
- Integers,
- Whole numbers.
And : R > I > W
The height of an airplane as it descends to an airport runway is in the whole numbers, rounded to the nearest 100 feet.
Answer: Whole number.

Final answer:

The height of an airplane during its descent to an airport runway is influenced by factors like approach angle, stall speed, and descent rate.

Explanation:

The height of an airplane as it descends to an airport runway is determined by various factors such as approach angle, stall speed, and glide slope.

During descent, the pilot manages corrections for side-winds, updrafts, and downdrafts to aim for a specific touchdown point on the runway.

Typically, the descent rate of an aircraft during landing is about 500 feet per minute, translating to approximately 8 mph.

The ideal width of a certain conveyor belt for a manufacturing plant is 50 in. an actual conveyor belt can vary from the ideal by 7/32 in. find the acceptable widths for this conveyor belt. CHECK ALL THAT APPLY
a) x>=49 24/32
b)x<=50 7/32
c)49 25/32<=x<=50 7/32
d)x+7/32<=50
e)absolute value of x-50 <=7/32

Answers

50 + 7/32 = 50 7/32
50 - 7/32 = 49 25/32

answers are :
c.) 49 25/32 < = x < = 50 7/32
e.) |x - 50| < = 7/32
     

Help me with this plz

Answers

For the inequality, you have to get the x by itself. So add 2 to both sides. Then the inequality will be 3x>3. Then divide by 3 on both sides to get x>1. The only graph that has a circle on 1 is the first one. Hope this helps! ;)

Add.

(8x-2)+(3x+10)

(Simplify answer)

Answers

8x-2+3x+10  combine like terms

(8x+3x)+(-2+10)

11x+8  There is no whole common factors so this is already simplified.
To simplify expressions, distribute if needed and combine like terms if needed.

Like terms are terms that have the same variable(s) (or lack thereof) and are to the same exponent. If a exponent is not shown, an exponent to 1 is implied.

In the expression 8x - 2 + 3x + 10 what terms can be combined? The terms -2 and 10 can be combined as they both have no variable and are to the same power.

8x - 2 + 3x + 10
8x + 3x + 8

Likewise with the terms 8x and 3x can be combined. Because they both have the variable and are to the same power.

8x + 3x + 8
11x + 8

So, 11x + 8 is the answer.

Add each pair of monomials and match it to the correct sum.

Tiles
-15u3 + 5u3
10u3 + (-5u3)
10u3 + 5u3
5u3 + (-10u3)

Answers

-10u^3
5u^3
15u^3
-5u^3

Answer:

-10u^3

5u^3

15u^3

-5u^3

Step-by-step explanation:

Given tiles

-15u^3+5u^3

10u^3+(-5u^3)

10u^3+5u^3

5u^3+(-10u^3)

Monomial : that type of polynomial in which only one term .

Adding of polynomial : when we add two polynomial  then the coefficient of    like terms will be added and sum of unlike terms remain . There is no change in the power of like terms and unlike terms.-15u^3+5u^3

coefficient of like terms means  same viable with same power  -15 and 5 .

Therefore, coefficient of these two terms added and no change in power of u^3

-15u^3+5u^3=-10u^3Similarly, 10u^3+(-5u^3)=5u^310u^3+5u^3=15u^35u^3+(-10u^3)=-5u^3

Coins are marked with the letters A-G. What is the probability of selecting a coin with a vowel on it?
a. 28.6%
b. 16.7%
c. 33.8%
d. 18.9%

Answers

A B C D E F G.

Out of these, 2/7 letters are vowels.

2 / 7 ≈ 0.286 
0.286 * 100 = 28.6%

Therefore the correct answer is A.
A is the correct answer. 
you take A and E which is 2 and you divide it by 7 because A-G is 7. 

The probability that an event will occur is fraction 2 over 3 . Which of these best describes the likehood of the event occurring?


Likely
Certain
Unlikely
Impossible

NEED HELP

Answers

Likely best describes the likelihood of the probability 2/3.  It is not completely certain, nor is it unlikely, and it definitely cannot be impossible.

Answer:

Likely is the answer

Step-by-step explanation:

If you know the probability line you will know how to get the answer

Which property is illustrated below?

1 + 7 = 7 + 1

identity property of addition
commutative property of addition
associative property of addition
distributive property

Answers

The answer should be commutative property.

a+b = b+a
1 + 7 = 7 + 1
Is an example of the commutative property of addition.
When the ORDER change it is commutative property.

The first term of a geometric series is a/b^2, and the common ratio is b/a^2. Find the next five terms of the geometric sequence.

Answers

Here it is in order (2nd to 6th):
1/ab, 1/a^3, b/a^5, b^2/a^7, b^3/a^9

Hope this helps!

Answer:

the next five terms are:

[tex]\frac{1}{ab} , \frac{1}{a^{3} } ,\frac{b}{a^{5} } ,\frac{b^{2} }{a^{7} } ,\frac{b^{3} }{a^{9} }[/tex]

Step-by-step explanation:

A geometric serie is a succession of terms on which every terms is the result of the last term multiply to a common ratio. for example, a geometric serie with inicial terms equal to 2 and the common ratio is 3, the four first numbers of the serie is given by

2, 6, 18, 54

Where every term is calculate as:

first term = 2

second term = first term x common ratio = 2 * 3 = 6

third term = second term x common ratio = 6 * 3 = 18

fourth term = third term x common ratio= 8 * 3 = 54

Then, with this exercise we have the same situation, the first term is [tex]\frac{a}{b^{2} }[/tex] and the common ratio is [tex]\frac{b}{a^{2} }[/tex], so we get:

first term = [tex]\frac{a}{b^{2} }[/tex]

second term = first term * common ratio = [tex]\frac{a}{b^{2} } *\frac{b}{a^{2} } = \frac{1}{ab}[/tex]

third term = second term * common ratio = [tex]\frac{1}{ab} *\frac{b}{a^{2} } =\frac{1}{a^{3} }[/tex]

fourth term = third term * common ratio = [tex]\frac{1}{a^{3} } *\frac{b}{a^{2} } = \frac{b}{a^{5} }[/tex]

fifth term = fourth term * common ratio= [tex]\frac{b}{a^{5} } *\frac{b}{a^{2} } = \frac{b^{2} }{a^{7} }[/tex]

sixth term = fifth term * common ratio= [tex]\frac{b^{2} }{a^{7} } *\frac{b}{a^{2} } = \frac{b^{3} }{a^{9} }[/tex]

so, the next five terms are:

[tex]\frac{1}{ab} , \frac{1}{a^{3} } ,\frac{b}{a^{5} } ,\frac{b^{2} }{a^{7} } ,\frac{b^{3} }{a^{9} }[/tex]

A recipe calls for 9 tablespoons of milk for every 21 cups of flour. If the chef puts in 168 cups of flour how many tablespoons of milk must the chef add

Answers

There are 8 sets of 21 cups in 168 cups so 9 times 8 is 72
The chef must add 72 cups of milk

In March Tom had -£165 in his bank account. In April he had -£156.

In which month did he have the least amount of money in his account?

Answers

It would be March because he had - 165 which is less than -156.

Answer:

March.

Step-by-step explanation:

We have been given that in March Tom had -£165 in his bank account. In April he had -£156.

We know that the a biggest negative number has least value as biggest negative numbers lie on the extreme left on the number line.

Since -£165 is more negative than -£156, so -£165 is the least amount.

Therefore, Tom had least amount of money in his account in March.

Find the value of the expression (4x−12)+(12xy−10)(4x-12)+(12xy-10) for x=4 and y=6

Answers

Answer:

398 ( did it on college bridge)

Step-by-step explanation:

The required value of the expression is 412 which is determined by substituting for x = 4 and y = 6.

What is the algebraic expression?

Unknown variables, numbers, and arithmetic operators make up an algebraic expression. It contains no equality or inequality symbols.

The expression is given in the question as:

(4x−12)+(12xy−10)(4x-12)+(12xy-10)

To find the value of the expression for a given value of x and y, we can substitute the values of x and y into the expression and evaluate it.

(4x−12)+(12xy−10)(4x-12)+(12xy-10)

Substituting x=4 and y=6 into the expression, we get:

(4(4)−12)+(12(4)(6)−10)(4(4)−12)+(12(4)(6)−10)

This simplifies to:

(16−12)+(12(24)−10)(16−12)+(12(24)−10)

This further simplifies to:

4+(12(24)−10)(4)+(12(24)−10)

4+(12(24)−10)(4)+(12(24)−10)

4+288+120 = 412

Therefore, the value of the expression for x = 4 and y = 6 is 412.

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How to simplify 10P6/10P4

Answers

[tex] nPk=\dfrac{n!}{(n-k)!}\\\\
\dfrac{ 10P6}{10P4}=\dfrac{\dfrac{10!}{4!}}{\dfrac{10!}{6!}}=\dfrac{10!}{4!}\cdot\dfrac{6!}{10!}=5\cdot6=30 [/tex]

If the probability of an event is 2/7, what must be the probability of its complement?

Answers

Answer:

[tex]\frac{5}{7}[/tex]

Step-by-step explanation:

Let

x------->the probability of its complement

we know that

The Complement Rule states that the sum of the probabilities of an event and its complement must equal [tex]1[/tex]

so

in this problem

[tex]\frac{2}{7}+x=1[/tex]

solve for x

Adds [tex]-\frac{2}{7}[/tex] both sides

[tex]x=1-\frac{2}{7}[/tex]

[tex]x=\frac{5}{7}[/tex]

The probability of its complement is 5/7

What is the complement of a probability event?

The complement of a probability event is the event that contains all of the universal elements of the event but is not found in the provided event.

From the given information:

The provided event (x) = 2/7

The complement of an event is mathematically calculated as:

P(C') = 1 - (x)

P(C') = 1 - 2/7

P(C') = 5/7

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When writing an equation in exponential form , how can you tell by the number in parentheses if it's exponential growth or exponential decay?

Answers

One example of a growth is saving rate, let's say that the increase is 4% per annum

The multiplier is 100%+4%=104% = 1.04

The growth formula is
y = A₀(1.04)ˣ
Where A₀ is the initial value

One example of a decay is a decrease of 12% per annum

The multiplier is 100% - 12% = 78% = 0.78

The equation for the decay is 
y = A₀(0.75)ˣ

The difference between these two equations is that for the growth, we have a multiplier that is bigger than 1, whereas, for the decay, we have a multiplier that is less than 1. 


At the school carnival, Jade has a games booth with a spinner. The banner at her booth reads "40% chance of winning!" What is the chance that a player may not win?
A.20%
B.30%
C.50%
D.60%

Answers

D.60%

60% + 40% = 100%


Hope this helps: )

Answer:

60%

Step-by-step explanation:

Since the entire percentage is 100 than  40 plus 60 is a hundred

Jimmy set his score for his math test. After the math teacher returnee his paper to him, he realized that if he increased his target by 10%, he would need 1 more mark to reach his actual score. If he increased his target by 15%, this target would exceed his actual test marks by 3. What is his actual test score.

Answers

When ever you have percentages, it should be helpful to bear in mind you can express them as multipliers. In this case, it will be helpful.
So, if we let:
a = test score
b = target score
then, using the information given:
a = 1.1b + 1
a = 1.15b - 3
and we get simultaneous equations.
'1.1' and '1.15' are the multipliers that I got using the percentages. Multiplying a value by 1.1 is the equivalent of increasing the value by 10%. If you multiplied it by 0.1 (which is the same as dividing by 10), you would get just 10% of the value.
Back to the simultaneous equations, we can just solve them now:
There are a number of ways to do this but I will use my preferred method:
Rearrange to express in terms of b:
a = 1.1b + 1
then b = (a - 1)/1.1
a = 1.15b - 3
then b = (a + 3)/1.15
Since they are both equal to b, they are of the same value so we can set them equal to each other and solve for a:
(a - 1)/1.1 = (a + 3)/1.15
1.15 * (a - 1) = 1.1 * (a + 3)
1.15a - 1.15 = 1.1a + 3.3
0.05a = 4.45
a = 89

A Girl Scout camp served half of their granola with breakfast. After dinner they put the remaining 6250 g of granola on top of their yogurt dessert.
How many kilograms of granola did the Girl Scout camp start with ?
1 kilogram = 1000 grams

Answers

Well 6,250×2=12,500grams
1000 grams =1kg
So 12,500÷1,000=12.5kg
So your answer is 12.5 kg

About 145 out of 300 students prefer walking instead of riding the bus to school. About what percent of the students prefer walking?

Answers

145 / 300 = 0.483333...

0.483333... * 300 = 145.

Therefore it is 145%.
The answer is 145%
Hope this helps
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