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2 years ago

Why is this hard. I'm not a genius. but genius can only solve this problem.

Mathematics

2 answers:

shtirl [24]2 years ago

8 0

Answer:

very easy

Step-by-step explanation:

miss Akunina [59]2 years ago

6 0

Answer:

4 + 4 = 8

+ +

8 - 4 = 6

|| ||

13 8

___________________________

i dont iknow if im right :(

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What is 1 add 1 please help!!!!!!!!!!!!!!!PS first person to get it correct gets brainiest

Nadusha1986 [10]

Answer: 2

Step-by-step explanation:

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3 years ago

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Find the measures of the three angles, in radians, of the triangle with the given vertices: d(1,1,1), e(1,−5,2), and f(−2,2,7).

Oduvanchick [21]

Consider triangle DEF with vertices D(1,1,1), E(1,-5,2) and F(-2,2,7).

1. Find

$\overrightarrow{DE}=(1-1,-5-1,2-1)=(0,-6,1),\\ \\\overrightarrow{DF}=(-2-1,2-1,7-1)=(-3,1,6).$

Then

$\cos \angle D=\dfrac{0\cdot (-3)+(-6)\cdot 1+1\cdot 6}{\sqrt{0^2+(-6)^2+1^2}\cdot \sqrt{(-3)^2+1^2+6^2}}=\dfrac{0}{\sqrt{37} \cdot \sqrt{46} }=0.$

2. Find

$\overrightarrow{ED}=(1-1,1-(-5),1-2)=(0,6,-1),\\ \\\overrightarrow{EF}=(-2-1,2-(-5),7-2)=(-3,7,5).$

Then

$\cos \angle E=\dfrac{0\cdot (-2)+6\cdot 7+(-1)\cdot 5}{\sqrt{0^2+6^2+(-1)^2}\cdot \sqrt{(-3)^2+7^2+5^2}}=\dfrac{37}{\sqrt{37} \cdot \sqrt{83} }=\sqrt{\dfrac{37}{83}}.$

3. Find

$\overrightarrow{FE}=(1-(-2),-5-2,2-7)=(3,-7,-5),\\ \\\overrightarrow{FD}=(1-(-2),1-2,1-7)=(3,-1,-6).$

Then

$\cos \angle F=\dfrac{3\cdot 3+(-7)\cdot (-1)+(-5)\cdot (-6)}{\sqrt{3^2+(-7)^2+(-5)^2}\cdot \sqrt{3^2+(-1)^2+(-6)^2}}=\dfrac{46}{\sqrt{83} \cdot \sqrt{46} }=\sqrt{\dfrac{46}{83}}.$

$\angle E=\arccos0=\dfrac{\pi}{2},\\ \\
\angle D=\arccos\letf(\sqrt{\dfrac{37}{83}}\right)\approx 0.27\pi,\\ \\
\angle F=\arccos\letf(\sqrt{\dfrac{46}{83}}\right)\approx 0.23\pi.$

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3 years ago

What is the value of the following expression 7+18÷(6-3)

EleoNora [17]

First use PEMDAS

Parenthesis
Exponents
Multiplication
Division
Addition
Subtract

(6-3) That is 3, so now make your new equation which would be:
7+(18<span>÷3)
Then divide or use multiplication to find what multiply by 3 to get 18 which is 6x3 then get your new equation,
7+6 and your done! Just add and there you go ^_^</span>

5 0

3 years ago

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Need help with this question asap!!

bija089 [108]

Hello!

Our two angles are corresponding. Therefore they are congruent. This gives us the equation below.

3x+2=5x-10

We subtract 5x from both sides.

-2x+2= -10

We subtract 2 from both sides.

-2x=-12

We divide both sides by -2.

x=6

Therefore, our answer is A) 6.

I hope this helps!

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3 years ago

What is the answer for this problem what is x

kodGreya [7K]

X is 3 so 7(3+4)=49 hope that help

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3 years ago

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