Answer:
<h2>b. (144 + 121)(144 - 121)</h2>
Step-by-step explanation:
Use a² - b² = (a + b)(a - b)
144² - 121² = (144 + 121)(144 - 121)
That is 2(1/7 + 1/2)
= 2( 2/14 + 7/14)
= 2 * 9/14
= 18/14 = 9/7 units ( or 1 2/7 units)
Answer:
associative
combining
commutative
Step-by-step explanation:
1. <em>associative property of addition</em> since the grouping is changed
2. <em>combining like terms</em> since it's the addition of 4 and 6
3. <em>commutative property of addition</em> since it's a change of order
