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3 years ago

15

sunlight can penetrate a certain Lake to the depth of fifteen meters the lake is five and a half times deeper than the depth of

which light can penetrate in meters how deep is the lake

1 answer:

gizmo_the_mogwai [7]3 years ago

4 0

Fifteen times Fifteen point Five equals 82.2 so the answer would be 82.2 Meters

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Which of the following statements cannot be proven to be true?

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2 years ago

Are the equations lxl – 3 = 7 and [x] = 10 equivalent?

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They're not equivalent.

$|x|$ (vertical bars) represents the absolute value of x. How it works is that it turns negative numbers positive but leaves 0 and positive numbers alone (hence it gets a number's distance from 0 on the number line).

$[x]$ (square brackets) usually represents the floor function, which returns the largest integer that is less than or equal to x. (The floor of x can also be written as $\lfloor x \rfloor$ --- it depends on what your textbook/source says).

To solve $|x| - 3 = 7$ , you first transform it into the equivalent equation $|x| = 10$ . Then by definition of absolute value, there are only two solutions for the first equation: x = 10 or x = -10.

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The floor of 10.1 is 10, so $[10.1] = 10$ , thus another solution for the second equation is x = 10.1.

The two equations do not have the same solution set (as x = 10.1 does not solve |x| - 3 = 7 but solves [x] = 10), so they're not equivalent.

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2 years ago

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Step-by-step explanation:

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2 years ago

natka813 [3]

Step-by-step explanation:

1. -4

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I first wrote the answer of 2 , 3 and then 1 .

copy it carefully.

you may get confused

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