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AysviL [449]
2 years ago
10

What is the period of y = 8 cos (5pie x + 3pie/2)-9 Give an exact value. Units

Mathematics
2 answers:
bekas [8.4K]2 years ago
7 0

Answer:

\textsf{Period}=\dfrac{2}{5}

Step-by-step explanation:

<u>Standard form of a cosine function:</u>

f(x) = A cos(B(x + C)) + D

  • A = amplitude (height from the mid-line to the peak)
  • 2π/B = period (horizontal distance between consecutive peaks)
  • C = phase shift (horizontal shift - positive is to the left)
  • D = vertical shift

Given function:

      y= 8 \cos \left(5 \pi x+\dfrac{3 \pi}{2}\right)-9

\implies y= 8 \cos \left(5 \pi \left(x+\dfrac{3}{10}\right)\right)-9

Comparing with the standard form:

\implies \textsf{B}=5 \pi

\implies \textsf{Period}=\dfrac{2 \pi}{\sf B}=\dfrac{2 \pi}{5 \pi}=\dfrac{2}{5}

zzz [600]2 years ago
3 0

\\ \rm\Rrightarrow y=Acos(Bx+C)+D

  • This is the general formula and the period is 2π/B

Now our given function

\\ \rm\Rrightarrow y=8cos\left(5\pi x+\dfrac{3\pi}{2}\right)-9

On comparing we get

  • A=8
  • B=5π
  • C=3π/2
  • D=-9

Period:-

\\ \rm\Rrightarrow \dfrac{2\pi}{B}

\\ \rm\Rrightarrow \dfrac{2\pi}{5\pi}

\\ \rm\Rrightarrow \dfrac{2}{5}

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Can someone plz help me on this thank you and please stop giving me links
Brilliant_brown [7]

Answer: 900π

Step-by-step explanation: To calculate the area of a circle, we do πr^2, where r is the radius. The radius is 30, so the answer is 900π.

Hope this helps!

4 0
2 years ago
What is the answers to these questions
Vsevolod [243]

Answer:

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3 0
3 years ago
Given ab/bc = fe/ed find ac
zubka84 [21]
Well, you can cancel out the b and e, so a/c = f/d.

Then you cancel out a on the left side of the equation by multiplying both sides by 1/a which then gives you c = f/ad.

Hope this helps!
6 0
3 years ago
Solve each of the following quadratic equations<br><br> 3x=0.5x^2<br><br><br> 0=5x^2-2x+6
UNO [17]

<u>Question 1</u>

<u />3x=0.5x^{2}\\\\6x=x^{2} \\ \\ x^{2}-6x=0 \\ \\ x(x-6)=0 \\ \\ \boxed{x=0, 6}

<u>Question 2</u>

<u />0=5x^{2}-2x+6 \\ \\ x=\frac{2 \pm \sqrt{(-2)^{2}-4(5)(6)}}{2} \\ \\ x=\frac{2 \pm \sqrt{-116}}{10} \\ \\ x=\frac{2 \pm 2i\sqrt{29}}{10} \\ \\ \boxed{x=\frac{1 \pm i\sqrt{29}}{5}}

6 0
2 years ago
Find the diameter of the circle with the given circumference use 3.14 C=18
algol [13]
The formula for the circumference of a circle is pi * r * 2

First we solve for r (the radius)
pi*r*2 = C
pi*r*2 = 18

Divide 18 by 2
pi*r = 9

Then divide 9 by 3.14
pi= 9/3.14 which is 2.866

The diameter is 2 times length of the radius so multiply 2.866 by 2
The diameter is about 5.732
(And you can round of course)

Hope that helped
3 0
3 years ago
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