Wednesday

September 17, 2014

September 17, 2014

Posted by **christy** on Friday, January 20, 2012 at 3:27pm.

a) 3.215 (there is a line drawn over the 15)

b.) square root 10

c) 0.143639854024

d)4.312

can you please explain what i need to look at to tell which is which?

- math -
**Steve**, Friday, January 20, 2012 at 10:36pmany number whose decimal expression terminates or ends in a repeating group of digits is rational. Otherwise, probably not.

(a) 3.21515151515...

3 + 2/10 + 15/990 is rational

To find out what .0151515... is, let it be x

x = .015151515...

10x = .151515

1000x = 15.15151515...

subtract 10x from 1000x:

990x = 15

x = 15/990

(b)the square root of any number which is not a perfect square is irrational

(c) If that's exact, it terminates and is rational

(d) same

**Answer this Question**

**Related Questions**

7th grade math Ms.Sue please - 1. Which of these numbers can be classified as ...

Math ~CHECK MY ANSWER~ - 1) Which of these is a rational number? a. Pi b. Square...

Math ~CHECK MY ANSWERS~ - 1) Which of these is a rational number? a. Pi b. ...

math - 1. Rosa, Roberto, Andrea, and Inno find an estimate for the square root ...

Math - 1. If a number is not a rational number, then it is _____. (1 point) an ...

Algebra 1 - Tell whether each number in the list is a real number, a rational ...

alegbra 1 - Tell whether each number in the list is a real number, a rational ...

Math.. 3rd time posting /: HELP PLEASE! - Tell whether each number is a real ...

Math, ( Help please?)! - Tell whether each number is a real number, rational ...

Math homework - Tell whether each number is a real number, rational number, ...