Hurry please What is the rule for the reflection?

Mathematics

2 answers:

vazorg [7]2 years ago

7 0

The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi.

Crank2 years ago

4 0

Answer:

When you reflect a point across the line y = x, the x-coordinate and y-coordinate change places. If you reflect over the line y = -x, the x-coordinate and y-coordinate change places and are negated (the signs are changed). the line y = x is the point (y, x). the line y = -x is the point (-y, -x).

Step-by-step explanation:

Hope you understand

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Calculate the mean given the frequency table

DaniilM [7]

Answer:

~15.55 is the mean.

Step-by-step explanation:

The class of frequency is given as 0-9, 10-19 and 20-29.

First of all, let us taken middle value of class:

$\dfrac{0+9}{2} = 4.5$

$\dfrac{10+9}{2} = 14.5$

$\dfrac{20+9}{2} = 24.5$

Formula for mean:

$\text{Mean = } \dfrac{\sum (m \times f)}{\sum f}$

where f is the frequency

and m is the mean value calculated in above step (4.5, 14.5 and 24.5)

The frequencies are given as:

4.5 - 24

14.5 - 20

24.5 - 32

Putting the values in above formula:

$Mean = \dfrac{4.5\times 24+14.5\times 20 +24.5\times 32}{24+20+32}\\\Rightarrow \dfrac{108+290+784}{76}\\\Rightarrow \dfrac{1182}{76} \\\Rightarrow 15.55$