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Elenna [48]
3 years ago
6

IS ANYONE GOOD IN LAW OF COSINES..If so ill give brainlest​

Mathematics
1 answer:
marysya [2.9K]3 years ago
6 0

Answer:

X=70.5^o

Step-by-step explanation:

we know that

The formula of the law of cosines is equal to

c^2=a^2+b^2-2(a)(b)cos(C)

where

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

In this context

The formula to calculate the measure of angle X is equal to

YZ^2=XZ^2+XY^2-2(XZ)(XY)cos(X)

substitute the given values

22^2=20^2+18^2-2(20)(18)cos(X)

solve for cos(X)

484=400+324-(720)cos(X)

484=724-(720)cos(X)

(720)cos(X)=724-484

(720)cos(X)=240

cos(X)=240/720

X=cos^{-1}(240/720)=70.5^o

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Which is NOT an improper fraction that is equal to 8 ????
Ilia_Sergeevich [38]

Answer:

There are many improper fraction equal to eight, they include: 8/1, 16/2, 24/3, 32/4, 40/5, 48/6, 56/7, 64/8, 72/9 etc.When a multiple of eight is divided by the other factor with with when multiplied to eight gives the multiple, the result will be eight

8 0
2 years ago
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Alondra says that (12 + 31) × 5 is equivalent to 12 + 31 × 5 because of the associative property. Determine if Alondra is correc
MAXImum [283]

Answer:

No

Step-by-step explanation:

(12 + 31) × 5 = 215

12 + 31 × 5 = 167

order of operations are the rules that state the sequence in which the multiple operations in an expression should be solved.

Order of Operations :

1. Parentheses

2. Exponents

3. Multiplication and Division

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7 0
2 years ago
Greidella<br>Merthemen<br>Class ac<br>Convert the following<br>e, 2750g to<br>kg​
avanturin [10]

Answer:

there is a problem in question is hafe only

8 0
2 years ago
Please help. I need a step by step explanation. Extra points will be given as well as brainiest!!!
Shalnov [3]

Answer:

V =113.04

Step-by-step explanation:

A sphere has a surface area of 113.04

SA = 4 pi r^2

113.04 = 4 pi r^2

Let pi 3.14

113.04 = 4 *(3.14) r^2

113.04 = 12.56 r^2

Divide each side by 12.56

113.04/12.56 = r^2

9 = r^2

Take the square root of each side

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V = 4/3 pi r^3

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3 years ago
Determine if the triangles, ΔUVW and ΔBAC, are similar. If so, identify the similarity criterion.
alexandr402 [8]

Answer:

B). SAS similarity.

Step-by-step explanation:

In Δ WVU & ΔCAB,

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&

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∵ ΔWVU ≅  ΔCAB   (by SAS similarity)

7 0
2 years ago
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