Posted by Mary Ann on Tuesday, October 8, 2013 at 5:45am.
A positive integer minus a positive integer is always positive.
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 6:08am
If only two numbers are involved,
Let A and B be real, nonzero 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  Tell whether the difference between the two integers is always, 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, ...
 Math  is this statement always, sometimes, or never true: the absolute value of...
 Math  Tell whether the sum between the two integers is always, sometimes, or ...
 Algebra II  In an induction proof of the statement 4+7+10+...+(3n1)=n(3n+5)/2 ...
 DISCRETE MATHS  We need to show that 4 divides 1n2 whenever n is an odd ...
 math  If n is a positive integer, n! is the product of the first n positive ...
More Related Questions