SOLUTION: Well. I need help with distributive property and ratonal numbers. we were given problems at school and I dont understand how to do those problems. Example: 0.5(12x+80)And we cann

Algebra ->  Distributive-associative-commutative-properties -> SOLUTION: Well. I need help with distributive property and ratonal numbers. we were given problems at school and I dont understand how to do those problems. Example: 0.5(12x+80)And we cann      Log On


   



Question 343865: Well. I need help with distributive property and ratonal numbers. we were given problems at school and I dont understand how to do those problems. Example:
0.5(12x+80)And we cannot use a calculator on the test. so please help asap!! and i also need help on finding the sum or difference of fractions Example:
1/3 - 2/9 I just need you to please help me go through the problem step by step. & then give me the answer. thank you!! email me! secretrockstar35@aol.com

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Bring the multiplier inside the parentheses and multiply everything inside by it.
0.5%2812x%2B80%29=%280.5%2812x%29%2B0.5%2880%29%29=%286x%2B40%29
It's that simple.
2%28x%2By%2Bz%2B13%29=%282x%2B2y%2B2z%2B26%29
OK?
.
.
.
Fractions, to add or subtract you need a common denominator.
Quickest way is to multiply the two denominators you have together.
1%2F3-2%2F9
You can use a common denominator or 3%2A9=27
%281%2F3%29%289%2F9%29=9%2F27
%282%2F9%29%283%2F3%29=6%2F27
So then
1%2F3-2%2F9=9%2F27-6%2F27
1%2F3-2%2F9=%289-6%29%2F27
1%2F3-2%2F9=3%2F27
1%2F3-2%2F9=1%2F9
If you don't use the lowest common denominator (LCD), you will have to simplify your final answer. In your case 9 was the LCD.
Another example,
3%2F8%2B1%2F5=%283%2F8%29%285%2F5%29%2B%281%2F5%29%288%2F8%29
3%2F8%2B1%2F5=15%2F40%2B8%2F40
3%2F8%2B1%2F5=23%2F40
In that case, 40 was the LCD.
OK?