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katrin [286]
3 years ago
6

The security alarm on a parked car goes off and produces a frequency of 951 hz. the speed of sound is 343 m/s. as you drive towa

rd this parked car, pass it, and drive away, you observe the frequency to change by 99 hz. at what speed are you driving?
Mathematics
1 answer:
AVprozaik [17]3 years ago
7 0
951hz divide by 343m/s = <span>2.77259475
times the answer by 99hz = </span><span>274.48688
to 1 d.p is 274.5m/s</span>
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TRUE/FALSE. the lengths of the altitude of a hypotenuse is the geometric mean of the lengths of the segments of each of the legs
vitfil [10]

In Right Angled Triangle the lengths of the altitude of a hypotenuse is the geometric mean of the lengths of the segments of each of the legs is TRUE

What is a Right angled triangle?

A triangle is said to be right-angled if one of its angles is exactly 90 degrees. The total of the other two angles is 90 degrees. Perpendicular and the triangle's base are the sides that make up the right angle. The longest of the three sides, the third side is known as the hypotenuse.

The right triangle's three sides are interconnected. The Pythagorean Theorem explains this connection. This theorem states that the Hypotenuse2 = Perpendicular2 + Base2.

  • The right angle, or 90°, is always one angle.
  • The hypotenuse is the side with the 90° angle opposite.
  • The longest side is always the hypotenuse.
  • The other two inner angles add up to 90 degrees.

Let assume a right-angled triangle ABC, right-angled at A.

Let AD be the perpendicular drawn from vertex A on hypotenuse BC, intersecting BC at D.

Now, In right-angle triangle ABC,

By using Pythagoras Theorem, we have

AB^2 +AC^2 = BC^2

Now, In right-angle triangle ABD

Using Pythagoras Theorem, we have

AB^2 =AD^2 + BD^2

Now, In right-angle triangle ACD,

AC^2 = AD^2+CD^2

On adding equation (2) and (3), we get

AB^2 +AC^2 = 2AD^2+ BD^2 +CD^2

Now, using equation (1), the above equation can be rewritten as

2AD^2 +CD^2+BD^2 = BC^2

can be further rewritten as

2AD^2 +BD^2 +CD^2 = (CD+BD)^2\\\\BD^2 +CD^2 +2(BD)(CD)=2AD^2 +BD^2 +CD^2\\\\(BD)(CD)=AD^2

AD is geometric mean of BD and CD

Learn more about Right angled triangle from the link below

brainly.com/question/3770177

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8 0
2 years ago
I need help with finding the equation for #20 and # 22 for my brother we get the answer but it’s hard for us to write out how to
Pavel [41]

Answer:

Im not sure about 20 but 22 is 48

Step-by-step explanation:

4×96 =384

384÷8 = 48 orange per classroom

8 0
4 years ago
14 &gt; 5(1 - x) + 2 (x +3)
kupik [55]
14  \geq  5(1 - x) + 2 (x +3) \\ \\ 14 \geq 5-5x+2x+6 \\  \\14 \geq 11-3x\\ \\3x \geq 11-14 \\ \\3x \geq -3 \ \ /:3 \\ \\x \geq -1\\ \\x \in
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4 years ago
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U Make It is having a 20% off your entire purchase sale. Rebecca is buying 6 skeins of yarn. Each skein costs $3.95. The tax on
maxonik [38]

Answer:

The correct answer is option D

Step-by-step explanation:

Number of yarns purchased by Rebecca = 6\\

Cost of one yarn = 3.95\\

Cost of 6 yarn = 6 * 3.95\\

Cost of 6 yarn after discount of 20\\ %

= 6 * 3.95 * 0.8\\

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Nonamiya [84]

Answer:

it is 2 1/10 i took the test from K12

Step-by-step explanation:

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