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1 year ago

7

A light bulb's brightness is reduced when placed behind a screen. The amount of visible light produced by the light bulb decreas

es by 25% with each additional layer that is added to the screen. With no screen, the light bulb produces 750 lumens. The lumen is a unit for measuring the total quantity of visible light emitted by a source.
Select the correct equation that can be used to represent the lumens, L, after x screen layers are added.

A.
L = 750(1.25)x
B.
L = 750(0.75)x
C.
L = 750(0.975)x
D.
L = 750(0.25)x

1 answer:

Rom4ik [11]1 year ago

7 0

Answer:

B

Step-by-step explanation:

L=750(0.25)×

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Combine fractions with the lowest common denominator.

$\bf{\dfrac{5x(-7)}{2}=\dfrac{3}{4}x+14 }$

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↓

<h3>Verification</h3>

Let x=12.

$\bf{\dfrac{5}{2}\times12-7=\dfrac{3}{4}\times12+14 }$
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$\bf{30-7=\dfrac{3\times12}{4}+14 }$
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$\bf{30-7=9+14 }$
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