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natita [175]
2 years ago
14

During the early 20th century, in what way was the radio better than the phonograph in encouraging the concept of crosspollinati

on?
Select one:
a. Phonographs were mostly owned by the wealthy
b. There were not enough records available
c. Phonographs were inferior in sound quality
Mathematics
1 answer:
ololo11 [35]2 years ago
6 0

C. Phonograph were inferior in sound quality.

Step-by-step explanation:

Researches have shown that plants respond to the sounds of their pollinator.

Some plants begin to produce a greater amount of nectar and some begin to vibrate to attract the attention of the pollinators towards them.

Greater the intensity of the sound of the pollinator, the faster the reaction will be.

Phonographs have a sound of lower intensity when compared to the intensity of sound produced by the radio.

Thus the radio was better than the phonograph in encouraging the concept of cross-pollination.

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the sum of three times a number and 2 less than 4 times the same number is 15. which of the following equations could be used to
Ulleksa [173]
To solve for a number x,

3x+4x-2=15
7x-2=15
7x=17
x=2 3/7
or x=~2.43

was one of your answer choices either of the first two equations?
4 0
2 years ago
What is an adaptation?<br><br> I put math but its science
Verdich [7]

Answer:

A change in a species that helps it survive

Step-by-step explanation:

i took life science in 7th grade, and another word for this is a mutation (kinda... pls dont make me go there...)

6 0
3 years ago
Read 2 more answers
If 1/a, 1/b, 1/c are in Arithmetic Progress, show that 2ac/a+c.​
Iteru [2.4K]
  1. 1/b-1/a = 1/c-1/b [ since they are in arithmetic progress]
  2. 1/b+1/b = 1/c+1/a
  3. 2/b = (a+c)/ac
  4. 2ac = b(a+c)
  5. 2ac/(a+c) =b

6 0
3 years ago
Evaluate the following expression.<br><br> (-3)-2
natta225 [31]
-5 is your answer :))))


4 0
3 years ago
Find the missing length. The triangles are similar.
hodyreva [135]

Answer:

182

Step-by-step explanation:

First, we can say that ∠ACB and ∠BCF are opposite angles because they are not next to each other and are formed by intersecting lines. Therefore, ∠ACB = ∠BCF

Next, angles correspond with the side opposite of it. This means that, for example, ∠ACB corresponds with line AB and ∠BCF corresponds with line BF. Because ∠ACB and ∠BCF are equal and the triangles are similar, we can say that their corresponding sides have a ratio with each other. Similarly, ∠CAB corresponds to CB, ∠ABC corresponds to AC, ∠CWV corresponds to CV, and ∠CVW corresponds to CB.

Because the triangle CVW is isosceles, we can say that the angles whose corresponding sides are equal are equal as well, so ∠CAB = ∠ABC and ∠CVW = ∠CVW. Next, because ∠ACB and ∠BCF are equal and correspond to each other, and the other two angles in each triangle are equal to each other, we can say that the other two angles must be equal. Another way of putting this is like this:

Say that x = ∠CAB. Then,

∠CAB + ∠ABC + ∠ACB = 180

x + x + ∠ACB = 180

2x + ∠ACB = 180

subtract ∠ACB from both sides

180 - ∠ACB = 2x

Similarly, if y = ∠CWV,

180 - ∠WCV = 2y. Therefore, 2y=2x and y=x, so ∠CAB = ∠ABC = ∠CWV = ∠CVW.

Given this, we can say that sides CV and CW correspond with BC and AC. This means that the ratio between, for example, CV and BC is equal to the ratio between CW and AC. Therefore,

CV/BC = CW/AC

84/182 = 84/?

Filling in the blank, 84/182 is equal to 84/182, so ? = 182

8 0
3 years ago
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