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Gnesinka [82]
3 years ago
12

1) What is the value of the expression 3 4 + 15.45 - 19.75 + 7.87?

Mathematics
1 answer:
Delvig [45]3 years ago
6 0

Answer:

37.57

Step-by-step explanation:

34 + 15.45 - 19.75 + 7.87

34 + 15.45 = 49.45

49.45 - 19.75 + 7.87

49.45 + 7.87 = 57.32

57.32 - 19.75 = 37.57

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The index of refraction of quartz is anisotropic. Suppose that visible light is passing from one grain to another of different c
Anestetic [448]

Answer:

The reflectivity at the boundary of the two grains is 2.9×{10}^{-3}

Step-by-step explanation:

Given :

Refractive index of one grains (n_{1}) = 1.553

Refractive index of second grains (n_{2}) = 1.544

According to the fresnel equation,

∴ general equation of refraction ( reflectivity ) r = \frac{ n_{1} cos\alpha _{i}  - n_{2}cos_{t} }{ n_{1} cos\alpha _{i}  + n_{2}cos_{t} }

where cos\alpha _{i} = incident angle, cos\alpha _{t} = transmitted angle

but for normal incidence \alpha = 0°

so our equation become,

⇒   r =  \frac{n_{1} - n_{2} }{n_{1} + n_{2}}

     r = \frac{1.553 - 1.544}{1.553 + 1.544}

     r = \frac{0.009}{3.097}

     r = 2.9×10^{-3}

Therefor reflectivity at the boundary is given by r = 2.9×10^{-3}.

3 0
3 years ago
4) Ari can swim 2 laps per minute. Which equation represents the number of laps,
olya-2409 [2.1K]
It’s a, n=2m. ||||||||||||||||||||
5 0
3 years ago
I don't get why math exists
Goryan [66]

Answer:

easy thr slope is 8 type it

8 0
3 years ago
Read 2 more answers
What is the solution to the equation? 3x - 5 =7x -9
Alecsey [184]

Answer:

x=1

Step-by-step explanation:

3x - 5 =7x -9

Subtract 3x from each side

3x - 5-3x =7x-3x -9

-5 = 4x-9

Add 9 to each side

-5+9 = 4x-9+9

4 = 4x

Divide each side by 4

4/4 = 4x/4

1=x

5 0
3 years ago
Read 2 more answers
Ash Lee bought a new Brunswick boat for $17,000. He made a $2,500 down payment on it. The bank's loan was for 60 months. Finance
alekssr [168]

Answer:  $323.33

<u>Step-by-step explanation:</u>

($17,000 + $4,900 - $2,500) ÷ 60 months = $323.33 per month

    ↓                ↓              ↓

 price        finance      down payment

4 0
3 years ago
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