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Rudiy27
4 years ago
6

Classify each square root as rational or irrational. √4√9 √12 √17 √20 √25

Mathematics
1 answer:
Sati [7]4 years ago
3 0

Answer:

√4 rational

√9 rational

√12 irrational

√17 irrational

√20 irrational

√25 rational

Step-by-step explanation:

2² = 4

3²=9

√12 = 2√3 ⇒ p²/q² = 3

p and q are prims (irreducible fraction), therefore has maximum common divisor 1, and belong to the Integers.

p>q

p²=3q² ⇒ p is multiple of 3

If p² is divisible for 3 and the MDC (p and q) is 1, p²=3 and q=1. But it is absurd, because 3 is not a perfect square.

the rest is tasted the same way, but it will take too long so I won't put ...

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3 years ago
List five rational numbers between -4/5 and -2/3 . Please tell by step by step explaintion ​
attashe74 [19]

9514 1404 393

Answer:

  -0.67, -0.68, -0.69, -0.70, -0.71

Step-by-step explanation:

There are an infinite number of ways to do this.

Perhaps the simplest is to do it in decimal.

 -4/5 = -0.8

  -2/3 = -0.666... (repeating 6)

Any negative decimal number between these values will do. For example, ...

  -0.67, -0.68, -0.69, -0.70, -0.71

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If you want to choose fractions that are evenly spaced between the given values, you can find their difference, then divide that difference into 6 parts (1 more than the number of numbers you need).

  -2/3 -(-4/5) = 4/5 -2/3 = (12 -10)/(5·3) = 2/15 . . . . length of interval

  1/6 of this difference is ...

     (1/6)(2/15) = 2/90 = 1/45

The interval end point nearest 0 is ...

  -2/3 = -30/45

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<em>Additional comment</em>

The fractions we came up with could be referred to as "5 arithmetic means between -2/3 and -4/5." There is nothing in the problem statement suggesting the values need to be evenly spaced.

When doing this in decimal, you can obtain a new value simply by adding more digits to the decimal fraction:

  -0.68, -0.685, -0.6853, -0.68531, -0.799

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