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maw [93]
3 years ago
7

Someone help me please!

Mathematics
1 answer:
Dvinal [7]3 years ago
4 0

Answer:

The radius is 25 cm

A

Step-by-step explanation:

Area =\pi* r^2

Area = 625 * \pi

625 \pi = \pi * r^2                     The \pis cancel out

r^2 = 625                              Take the square roots of both sides              

sqrt(r^2) = sqrt(625)

r = 25

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cupoosta [38]

Answer:

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4 0
3 years ago
What is the frequency heard by a person driving at 15 m/s toward a blowing factory whistle (800. Hz) if the speed of sound is 34
bija089 [108]

Answer:

Answer:

835.29 Hz

Explanation:

When moving towards the source of sound, frequency will be given by

f*=f(vd+v)/v

Where f is the freqiency of the source, vd is the driving speed, v is the speed of sound in air, f* is the inkown frequency when moving forward.

Substituting 800 Hz for f, 340 m/s for v and 15 m/s for vd then

f*=800(15+340)/340=835.29411764704 Hz

Rounded off, the frequency is approximately 835.29 Hz

ı hope ıts true

Step-by-step explanation:

5 0
3 years ago
Evalute <img src="https://tex.z-dn.net/?f=%20sin%5E2%28%5Cfrac%7B%5Cpi%7D%7B12%7D%29%20" id="TexFormula1" title=" sin^2(\frac{\p
leonid [27]
Use the double angle identity:


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Then \cos\dfrac\pi6=\dfrac{\sqrt3}2, so you get


\sin^2\dfrac\pi{12}=\dfrac{2-\sqrt3}4
3 0
3 years ago
The product of 2x-3 and x+4 can be expressed asA) 2x^2+5x-12B) 3x+1C) 2x^2+x-12D) 2x^2-12
DanielleElmas [232]

The given product is

(2x-3)(x+4)

We have to use the distributive property

2x\cdot x+2x\cdot4-3\cdot x-3\cdot4=2x^2+8x-3x-12

Then, we reduce like terms

2x^2+5x-12<h2>Hence, the answer is A.</h2>
5 0
1 year ago
While on a business trip to Summerfield, Vera treated her co-workers to a meal that cost
Studentka2010 [4]

Answer:

  $15.21

Step-by-step explanation:

The tax and tip percentages are both being figured on the original bill amount, so they can be added. The tax and tip together come to ...

  11.75% +15% = 26.75%

This is added to the original bill amount, so the final total will be ...

  $12 + $12×0.2675 = $12×1.2675 = $15.21

Vera's meal cost $15.21.

6 0
3 years ago
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