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Vaselesa [24]
3 years ago
14

A recent study showed that teenagers who had night light in their rooms as babies are more likely to suffer from myopia than tee

nagers who had not used night lights. But genetic factors are known to play a role, and near-sighted parents are more likely to install a night light in their children's room.This makes it hard to tell if the night light caused the subsequent myopia. This is an example of
A. double-blinding
B. the placebo effect
C.confounding
D.control
E. an explanatory variable
Mathematics
1 answer:
Reil [10]3 years ago
8 0

Answer:

I think its B. Im like 87% sure its B

Step-by-step explanation:


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Look at the image. thanks :)
gregori [183]

Answer:

B. (8, 4)

Step-by-step explanation:

Hope this helps!

3 0
2 years ago
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Write the following in expanded exponential form a. 30405
lana [24]

Answer:

30000+0+400+0+5

6000000+800000+0+4000+100+50+2

Step-by-step explanation:

hope it's right plz mark me brainlists

7 0
2 years ago
Pqr is similar to xyz what is the perimeter of xyz? A.21cm B.63cm C. 105cm D.126cm
skelet666 [1.2K]

Answer:

option D. 126 cm

Step-by-step explanation:

step 1

Find the scale factor

we know that

If two figures are similar, then the ratio of its corresponding sides is proportional and this ratio is called the scale factor

In this problem

Triangles PQR and XYZ are similar by AA Similarity Theorem

so

\frac{XY}{PQ}=\frac{YZ}{QR}=\frac{XZ}{PR}

Let

z ---> the scale factor

z=\frac{XY}{PQ}

substitute the given values

z=\frac{30}{5}=6

step 2

Find the perimeter of triangle XYZ

we know that

If two figures are similar, then the ratio of its perimeters is equal to the scale factor

Let

z ----> the scale factor

p_1 ----> the perimeter of triangle XYZ

p_2 ---> the perimeter of triangle PQR

so

z=\frac{p_1}{p_2}

The perimeter of triangle PQR is

p_2=5+10+6=21\ cm

we have

z=6\\p_2=21\ cm

substitute

6=\frac{p_1}{21}

p_1=6(21)=126\ cm

therefore

The perimeter of triangle XYZ is 126 cm

5 0
3 years ago
Which are equivalent to Two and three-fourths times eight-ninths? Check all that apply.
stira [4]

Answer: Eleven Fourths xEight Ninths.

Step-by-step explanation: To get the mixed number Eleven Fourths, you have to multiply 4x2 (4 as the denominator and 2 as the whole number) to get 8, and add 3 (numerator) to get 11, and then put 4 over it as the original denominator to get 11/4. Then, just plug back in the numbers: 11/4 x 8/9 (Eleven-Fourths times Eight-Ninths)

5 0
3 years ago
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Factor the expression completely.<br><br> 54 + 45x
kompoz [17]
9(6+5x) hope this helps!
5 0
3 years ago
Read 2 more answers
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