Monday

March 2, 2015

March 2, 2015

Posted by **Mary Ann** on Tuesday, October 8, 2013 at 5:45am.

This statement is sometimes true. For example, 17 – 5 = 12, but 15 – 20 = –5.

post five other statements about the addition and subtraction of positive and negative integers, and ask whether each is always true, sometimes true, or never true.

- Algebra -
**Jai**, Tuesday, October 8, 2013 at 6:08amIf only two numbers are involved,

Let A and B be real, non-zero numbers.

1) (+)A + (+)B = (+) ?

This is always true.

2) (-)A + (-)B = (-) ?

This is always true.

3) (+)A - (-)B = (+) ?

This is always true.

4) (-)A - (+)B = (-) ?

This is always true.

5) (-)A - (-)B = (+) ?

This is not always true. For instance,

-5 - (-3) = -2, but -3 - (-5) = +2.

Hope this helps~ :3

**Answer this Question**

**Related Questions**

math - Which statement is true? A.The sum of two positive integers is sometimes ...

Math - When you add a positive integer and a negative integer, you sometimes get...

MATH - Find the only positive integer whose cube is the sum of the cubes of ...

7th grade math - Which of these statements is true when you add a positive, ...

Algebra II - In an induction proof of the statement 4+7+10+...+(3n-1)=n(3n+5)/2 ...

Math 7 Help! - 1. negative integer is less than positive integer somtimes, ...

Algebra - True or False. The fifth root of a positive integer is sometimes ...

DISCRETE MATHS - We need to show that 4 divides 1-n2 whenever n is an odd ...

Algebra - Tell whether the each statement is sometimes, always or never true 1) ...

Math - Paulo withdraws the same amount from his bank account each week to pay ...