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riadik2000 [5.3K]
3 years ago
6

Which statement is true?

Mathematics
2 answers:
Alex17521 [72]3 years ago
8 0
The answer is D, mechanical waves have to travel through stuff while electromagnetic waves are just excited energy which can exist by itself
Alexus [3.1K]3 years ago
6 0

Answer:

D) Mechanical waves require a medium, but electromagnetic waves do not.

Step-by-step explanation:

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r-ruslan [8.4K]
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5 0
3 years ago
In 1900, there was an Olympic underwater swimming event. The score was calculated by giving one point for each second the swimme
mash [69]
68.4*1= 68.4   60.2*2= 120.4   68.4+120.4=    188.8
4 0
3 years ago
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What is 3a+22.5h*37q? im lost plz help
erik [133]
The answer is 185hq+3a
7 0
3 years ago
Help geometry what I m jlf <br> Picture provided
Zolol [24]

Answer:

\angle\,JLF = 114^o  which agrees with option"B" of the possible answers listed

Step-by-step explanation:

Notice that in order to solve this problem  (find angle JLF) , we need to find the value of the angle defined by JLG and subtract it from 180^o, since they are supplementary angles. So we focus on such, and start by drawing the radii that connects the center of the circle (point "O") to points G and H, in order to observe the central angles that are given to us as 90^o and 138^o. (see attached image)

We put our efforts into solving the right angle triangle denoted with green borders.

Notice as well, that the triangle JOH that is formed with the two radii and the segment that joins point J to point G, is an isosceles triangle, and therefore the two angles opposite to these equal radius sides, must be equal. We see that angle JOH can be calculated by : 360^o-90^o-138^o=132^o

Therefore, the two equal acute angles in the triangle JOH should add to:

180^o-132^o=48^o resulting then in each small acute angle of measure 24^o.

Now referring to the green sided right angle triangle we can find find angle JLG, using: 180^o-24^o-90^o=66^o

Finally, the requested measure of angle JLF is obtained via: 180^o-66^o=114^o

4 0
3 years ago
What is the value of this expression? 4/15+3/5−2/3 Enter your answer in the box as a fraction in simplest form.
forsale [732]

Answer:

\frac{4}{15}  +  \frac{3}{5}  -  \frac{2}{3}

\frac{4 \times 1}{15 \times 1}  +  \frac{3 \times 3}{5 \times 3}  -  \frac{2 \times 5}{3 \times 5}

\frac{4}{15}  +  \frac{9}{15}  -  \frac{10}{15}

\frac{4 + 9 - 10}{15}

\frac{13 - 10}{15}

\frac{3}{15}

\frac{1}{5}

hope it helps you :)

have a great day

7 0
3 years ago
Read 2 more answers
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