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4 years ago

Explain the Error

Mathematics

1 answer:

Dvinal [7]4 years ago

8 0

1+1+1+1=4
2+2+2+2=16
3+3+3+3=?

I won against: Marilyn Wright-Brown

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Use the Law of Cosines to determine the indicated side x. (Assume b = 25 and c = 50. Round your answer to one decimal place.)

Rainbow [258]

The law of cosines can be written as:

$p^2=a^2+b^2-2\text{abCosP}$

Where

p, a, and b are the sides

P is the angle opposite of side p

Now,

x is what we want to find and other two sides given are 25 and 50 (let them be a and b)

Angle opposite to side unknown is 39 degrees, this is Angle P

Substituting, we get:

$\begin{gathered} p^2=a^2+b^2-2\text{abCosP} \\ x^2=25^2+50^2-2(25)(50)\text{Cos}39 \\ x^2=3125-2500Cos39 \\ x^2=3125-1942.86 \\ x=\sqrt[]{3125-1942.86} \\ x=34.38 \end{gathered}$

3 0

1 year ago

Help with this assignment

Irina-Kira [14]

Answer:

i think the answer is 21

hope it will help you

6 0

4 years ago

5x - y = -2<br> - 5x + y = 2<br> Solving systems of linear equations

mihalych1998 [28]

Hope it helps !! Thnxs

7 0

3 years ago

Four sisters contributed equally to buy a present for their father. They received a 10% discount on the original price of the gi

german

Answer:

54 dollars

Step-by-step explanation:

This is the price AFTER the discount

Let x be the price before the discount

-------------------------------------------------------

Price after discount = (price before discount) - (10% of price before discount)

54 = (x) - (10% of x)

54 = x - 0.10x

54 = 0.90x

0.90x = 54

0.90x/0.90 = 54/0.90 Divide both sides by 0.90 to isolate x.

x = 60

So the price before the discount was $60.

6 0

3 years ago

Please help due today

Alex17521 [72]

Answer:

x = 8

ABD = 46 degrees

DBC = 44 degrees

Step-by-step explanation:

Complementary Angles: two angles who’s sum together is 90 degrees

2x + 30 + 3x + 20 = 90

5x + 50 = 90

5x (+ 50 - 50) = 90 - 50

5x = 40

5x/5 = 40/5

x = 8

2(8) + 30

16 + 30

3(8) + 20

24 + 20

ABD = 46

DBC = 44

This is what I did in the photo

6 0

3 years ago