15 + (1/2)n = -20 subtract 15 from both sides
(1/2) N = -35 multiply both sides by 2
N = -70
9 is correct
6/2 (1 + 2) =
3 (3) = 9
For 1 to be correct we must have
6/ [2(1 +2)] =
6/ [2(3)]=
6/[6] = 1
This shows that the placement of parentheses and/or brackets IS important !!!
Thanks, Guest....we could also see this by cross-product equality [if cross products of two fractions are equal, the fractions themselves are equal ]
5/4 = 35/28 because
28 * 5 = 35 *4
140 = 140
[9 x 14] / 3 = [9/3] * 14 = 3 * 14 = 42 bags
3i
Nope...it's irrational....and irrational numbers never terminate
I assume this might be:
[1/5]([5/2]x-10)=4(x+3) simplify
(1/2)x - 2 = 4x + 12 multiply both sides by 2
x - 4 = 8x = 24 subtract x from both sides....subtract 24 to both sides
-28 = 7x divide both sides by 7
-287 = x = -4
You are correct.....!!!!
8904^7 = 4,437,067,742,200,136,849,827,037,184 [ about 4.437 octillion ]
Look here : http://www.purplemath.com/modules/lcm_gcf.htm
The info you want is about half-way down the page where they talk about the Least Common Multiple [also known as the Common Denominator ]
Hope this helps....write back if you get stuck....!!!!
