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In-s [12.5K]
3 years ago
9

My brother is 5 years older than I am. My sister is 3 years younger than I am.

Mathematics
2 answers:
grin007 [14]3 years ago
7 0

Answer:

8 years older then your younger sister

erica [24]3 years ago
3 0

Step-by-step explanation:

5 plus 3 equals 8 so the brother was 8 when the sister was m years old

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Which expression is equivalent to m² - 13m - 30?​
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3 0
3 years ago
Are the equations lxl – 3 = 7 and [x] = 10 equivalent?
zvonat [6]

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.

[x] = 10 has infinitely many solutions. For example, the floor of 10 is 10, so [10] = 10, thus a solution for the second equation is x = 10

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.

5 0
2 years ago
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