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Svet_ta [14]
3 years ago
9

CAN SOMEBODY PLS HELP ME???????? WORTH 30 points

Mathematics
2 answers:
defon3 years ago
7 0

Answer:

I think the answer is 8

Step-by-step explanation:

Anna [14]3 years ago
5 0
10 if your counting the ones inside to.
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Find all solutions to cosx cos3 x-sinx sine3x= 0 on the interval {0,2pi}
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\bf \textit{Sum and Difference Identities}
\\ \quad \\
sin({{ \alpha}} + {{ \beta}})=sin({{ \alpha}})cos({{ \beta}}) + cos({{ \alpha}})sin({{ \beta}})
\\ \quad \\
sin({{ \alpha}} - {{ \beta}})=sin({{ \alpha}})cos({{ \beta}})- cos({{ \alpha}})sin({{ \beta}})
\\ \quad \\
\boxed{cos({{ \alpha}} + {{ \beta}})= cos({{ \alpha}})cos({{ \beta}})- sin({{ \alpha}})sin({{ \beta}})}
\\ \quad \\
cos({{ \alpha}} - {{ \beta}})= cos({{ \alpha}})cos({{ \beta}}) + sin({{ \alpha}})sin({{ \beta}})\\\\
------------------------

\bf cos(x)cos(3x)-sin(x)sin(3x)=0\implies cos(x+3x)=0
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cos(4x)=0\implies cos^{-1}[cos(4x)]=cos^{-1}(0)\implies 4x=cos^{-1}(0)
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4x=
\begin{cases}
\frac{\pi }{2}\\\\
\frac{3\pi }{2}
\end{cases}\implies 
\begin{cases}
4x=\cfrac{\pi }{2}\implies &\measuredangle  x=\cfrac{\pi }{8}\\\\
4x=\cfrac{3\pi }{2}\implies &\measuredangle x=\cfrac{3\pi }{8}
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5 0
3 years ago
A triangle has a perimeter of 77 inches. What are the side lengths of a, b, and c?
Yuki888 [10]

Answer:

I believe this is pathgorean theorem, which I did at the beginning of alegbra last year. It is basically finding the missing side of a triangle. (Trust me some of the easiest stuff you do all year) Below are my notes from last year. I hope it helps! Good Luck!!!

Step-by-step explanation:

Given two sides

If you know two other sides of the right triangle, it's the easiest option; all you need to do is apply the Pythagorean theorem:

a² + b² = c²

if leg a is the missing side, then transform the equation to the form when a is on one side, and take a square root:

a = √(c² - b²)  

if leg b is unknown, then

b = √(c² - a²)  

for hypotenuse c missing, the formula is

c = √(a² + b²)

6 0
3 years ago
Mia has a rectangle shape brownie. She cuts the brownie into 3 equal pieces.Which sentence is true ?
MAXImum [283]

Answer:

The whole brownie is 3/3

Step-by-step explanation:

Hello!

This is a classic fractions exercise.

The whole brownie was cut in three equal pieces. Each piece represents 1/3 of the brownie.

If you add the three pieces together 1/3+1/3+1/3 you get the whole brownie again 3/3 = 1

-Options-

The whole brownie is 1/3.

<em>The whole brownie is 3/3. </em>

The whole brownie is 2/3.

The whole brownie is 3/2.

I hope this helps!

4 0
3 years ago
Which is the value of this expression when a = negative 2 and b = negative 3? (StartFraction 3 a Superscript negative 3 Baseline
natta225 [31]

Answer: The answer is D

729 over 64

4 0
4 years ago
Read 2 more answers
I BEG FOR HELP PLEASE
yanalaym [24]

Answer:

answer is C

Step-by-step explanation:

The y values will only go to ∞ no matter the x values

8 0
3 years ago
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