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Gnom [1K]
3 years ago
7

WILL GIVE BRAINLIEST!!!! Write the following as an EXPRESSION: How much water do I need to add to l liters of pure alcohol to ob

tain a solution of 45% alcohol?
Mathematics
1 answer:
nydimaria [60]3 years ago
5 0

Answer:

If you add 690 ml of water you will obtain 1.690 liter of 70% alcohol. Of course if you halve the amounts, e.g. 0.5 liter 75% alcohol and 345 ml of water, you will also obtain 45% alcohol solution.

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Volume of composite figures
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<u>✍️</u><u>Answer:</u>

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✮✮✮✮✮✮✮✮✮

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3 years ago
What is fraction of 7/20
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What do you mean? the decimal is .35 and u can't simplify it anymore
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3 years ago
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According to ​Lambert's law​, the intensity of light from a single source on a flat surface at point P is given by Upper L equal
malfutka [58]

Answer:

(a) L = k*(1 - sin^{2}(\theta))        

(b) L reaches its maximum value when θ = 0 because cos²(0) = 1

Step-by-step explanation:

Lambert's Law is given by:

L = k*cos^{2}(\theta)   (1)

(a) We can rewrite the above equation in terms of sine function using the following trigonometric identity:

cos^{2}(\theta) + sin^{2}(\theta) = 1

cos^{2}(\theta) = 1 - sin^{2}(\theta)  (2)

By entering equation (2) into equation (1) we have the equation in terms of the sine function:

L = k*(1 - sin^{2}(\theta))        

(b) When θ = 0, we have:

L = k*cos^{2}(\theta) = k*cos^{2}(0) = k  

We know that cos(θ) is a trigonometric function, between 1 and -1 and reaches its maximun values at nπ, when n = 0,1,2,3...

Hence, L reaches its maximum value when θ = 0 because cos²(0) = 1.

I hope it helps you!

5 0
3 years ago
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What is the area of the figure? I give brainliest and thanks! :)
Alex17521 [72]

Answer:

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7 0
3 years ago
2 = 1/2(7x - 4)<br> I need help finding the answer to this equation!!
zlopas [31]

Answer:

2 =  \frac{1}{2} (7x - 4)

________________________________

2 \times 2 = 7x - 4

________________________________

4  + 4 = 7x

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8 = 7x

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x =   \frac{8}{7}

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x =  1 \frac{1}{7}

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hope it helped you:)

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3 years ago
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