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Anastasy [175]
3 years ago
13

Father is four times as old as Mary. Five years ago he was seven times as old. How old is the father now?

Mathematics
1 answer:
melamori03 [73]3 years ago
7 0

Answer:

If Father is four times older than Mary, that would be 4 times 10-- which equals 40. Five years ago, Mary must have been 5 years old. So, multiply 7 and 5 and you'll get 35! Father would have been 35 years old.

I hope this helps!

Step-by-step explanation:

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Answer:

48 girls

Step-by-step explanation:

Boys: Girls

7       :8

We need to get to 42 boys so we will multiply by 6

7*6 = 42

Boys: Girls

7*6   :8*6

42        48

There were 48 girls

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At what angle above the horizontal is the sun if sunlight reflected from the surface of a calm lake is completely polarized? Not
love history [14]

Answer:

θ = 36.94°

Step-by-step explanation:

Brewster's law for polarization states that; tan(θ_p) = n2/n1

Where ;

θ_p is the polarizing angle

n1 is the index of refraction of first material

n2 is the index of refraction of second material

Now, our first material here is air while second material is water.

Index of refraction of water = 1.33 while index of refraction of air is 1

Thus,

tan(θ_p) = n2/n1 = 1.33/1

tan(θ_p) = 1.33

(θ_p) = tan^(-1)1.33

(θ_p) = 53.06°

Now, polarizing angle is the angle of incidence for which all the reflected light is polarized and it's above the vertical. Thus to get the angle to the horizontal, it will be;

θ = 90° - (θ_p) = 90° - 53.06° = 36.94°

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Read 2 more answers
Accidentally chose that but please help will give brainliest PLEASE​
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Answer:

The first chart

Step-by-step explanation:

when its set up as y = [5x] is 5 times x equals y, so going through each question, -2 x 5 = -10, -1 x 5 = -5, 0 x 5 = 0, 1 x 5 = 5, and 2 x 5 = 10

5 0
3 years ago
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