(.15)(10-x)+.45x=(.30)(10)?
回答 (6)
2009-03-05 3:39 pm
✔ 最佳答案
First distribute the (.15)1.5 - .15x + .45x = (.30) (10)
Then add the two like terms on the left
1.5 + .30 x = (.30) (10)
Then multiply the terms on the right
1.5 + .30 x = 3
Subtract 1.5 from both sides
.30 x = 1.5
multiply each side by 10 (move decimal one to the right)
3 x = 15
Solve
x = 5
Best to you.
2009-03-05 3:49 pm
(.15)(10-x)+.45x=(.30)(10)
1.5-0.15x+0.45x=3
1.5+0.3x=3
0.3x=3-1.5
0.3x=1.5
x=5 answer//
checking
0.15(10-5)+.45(5)=(.30)(10)
0.15(5)+0.75=3
0.75+2.25=3
3=3 correct!
1.5-0.15x+0.45x=3
1.5+0.3x=3
0.3x=3-1.5
0.3x=1.5
x=5 answer//
checking
0.15(10-5)+.45(5)=(.30)(10)
0.15(5)+0.75=3
0.75+2.25=3
3=3 correct!
2009-03-05 3:46 pm
(0.15)(10 - x) + 0.45x = (0.3)(10)
0.15*10 - 0.15*x + 0.45x = 3
1.5 - 0.15x + 0.45x = 3
-0.15x + 0.45x = 3 - 1.5
0.3x = 1.5
x = 1.5/0.3
x = 5
0.15*10 - 0.15*x + 0.45x = 3
1.5 - 0.15x + 0.45x = 3
-0.15x + 0.45x = 3 - 1.5
0.3x = 1.5
x = 1.5/0.3
x = 5
2009-03-05 3:39 pm
First multiply everthing out:
1.5 - 0.15x + 0.45x = 3.0
Then combine like terms:
1.5 + 0.3x = 3.0
Try to get x by itself by subtracting 1.5 from both sides:
0.3x = 1.5
Keep trying to get x alone by dividing both sides by 0.3:
x = 5
There's your answer!
1.5 - 0.15x + 0.45x = 3.0
Then combine like terms:
1.5 + 0.3x = 3.0
Try to get x by itself by subtracting 1.5 from both sides:
0.3x = 1.5
Keep trying to get x alone by dividing both sides by 0.3:
x = 5
There's your answer!
參考: Algebra class
2009-03-05 3:37 pm
First, let's simplify the equation:
0.15(10 - x) + 0.45x = 0.30(10)
We can simplofy the right side:
0.15(10 - x) + 0.45x = 3
Now multiply the 0.15 through the parenthesis:
1.5 - 0.15x + 0.45x = 3
Now combine like terms and solve:
1.5 + 0.3x = 3
0.3x = 1.5
x = 5
0.15(10 - x) + 0.45x = 0.30(10)
We can simplofy the right side:
0.15(10 - x) + 0.45x = 3
Now multiply the 0.15 through the parenthesis:
1.5 - 0.15x + 0.45x = 3
Now combine like terms and solve:
1.5 + 0.3x = 3
0.3x = 1.5
x = 5
2009-03-05 3:37 pm
(.15)(10-x)+.45x=(.30)(10)
1.5 - 0.15x + .45x = 3.0
personally, I hate decimals, multiply everything through by 100
150 - 15x + 45x = 300
150 + 30 x = 300
30x = 150
x = 5
1.5 - 0.15x + .45x = 3.0
personally, I hate decimals, multiply everything through by 100
150 - 15x + 45x = 300
150 + 30 x = 300
30x = 150
x = 5
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