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beks73 [17]
3 years ago
8

Pls help, I don't understand ​

Mathematics
1 answer:
Ne4ueva [31]3 years ago
5 0

1 Yes 2. Yes

Step-by-step explanation:

they are similar because in problem one each side is related by a factor of 3

in problem 2 each side is related by a factor of 2.

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A plate of glass with parallel faces having a refractive index of 1.57 is resting on the surface of water in a tank. A ray of li
frutty [35]

Answer:

27.26^{\circ}

Step-by-step explanation:

We are given that

n_g=1.57

n_w=1.33

Angle of incidence,i=37.5 degree

We have to find the angle of refraction into the water made by ray wit the normal to the surface.

Refractive index of water,n_a=1

By Snell's law

\frac{n_g}{n_a}=\frac{sin i}{sin r}

sin r=\frac{n_a sini}{n_g}=\frac{1\times sin37.5}{1.57}

sin r=0.388

r=sin^{-1}(0.388)=22.83^{\circ}

Again for glass water surface

Using Snell's law

Angle of incidence,i'=22.83 degree

\frac{n_w}{n_g}=\frac{sin i}{sin r}

\frac{1.33}{1.57}=\frac{sin22.83}{sin r'}

sin r'=\frac{1.57sin(22.83)}{1.33}=0.458

r'=sin^{-1}(0.458)=27.26^{\circ}

8 0
3 years ago
Pls pls help me with the problem above
love history [14]

I know angle DAB is 20 since it'a an indicated angle and I'm not sure about any of the other ones sorry.

8 0
4 years ago
50 POINTS!!! HELP ASAP! The table below shows the distribution of students by age in a high school
Damm [24]

Answer: B.

Step-by-step explanation: The probability that a student is 15 years old includes those who are only 15: 450 students. This means that of 1,500 there are 450 students who are 15. The probability is set up as: 450/1,500 or 0.30.

7 0
3 years ago
Write an equation for the nth term of the arithmetic sequence 37, 29, 21, 13, ....
aleksley [76]

Answer:

n= 37 -8n

the first n is the end result, the second in the equation is the __ number, the nth number

Step-by-step explanation:

4 0
3 years ago
Figure 3 shows a sketch of part of the curve C with equation
vampirchik [111]

Answer:

Step-by-step explanation:

because The curve C crosses the x-axis at the origin and at the points A and B =>  the x coordinates of A and B are the solution of the equation:

 x(x + 4)(x - 2) = 0

<=> x = 0

      x = -4

      x = 2

because the x-coordinates of the points A and B aren't 0 and the x-coordinate

of A is a negative value

=>  the x-coordinate of  A is -4

the x-coordinate of B is 2

8 0
3 years ago
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