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Recent problems solved by 'Taxie'

Taxie answered: 4 problems

Equations/505468: How would I work out the two step equations 13=8-5d?
I added 8 to both sides and then divided both sides by 5 but, that is wrong.
It's what my teacher told me to do.
Do I have to act like 5d is -5d?
Is the equation adding 8 to 5d?
1 solutions

Answer 339898 by Taxie(4) on 2011-09-27 17:37:34 (Show Source):

You can put this solution on YOUR website!
1. Subtract 8 from both sides. You get 13 - 8 = 8 -5d -8. or: 5 = -5d
2. Now divide both sides by - 5. You get. -1 = d
Done.

Rate-of-work-word-problems/505410: I really need help with this and need this word problem translated into an algebraic equation with only one variable. Then it needs to be simplified.
Question:
The area of a rectangle is 72 square inches. If the length is 40 inches greater than four times the width, what are the dimensions of the rectangle?
1 solutions

Answer 339890 by Taxie(4) on 2011-09-27 16:57:24 (Show Source):

You can put this solution on YOUR website!
call the width w. The length is then 4w+40
The area of the rectangle is then. 72 = 4w + 40
Simplify dividing the equation by 4 to get. 18 = w + 10
The solution is w = 8
(sorry I misread 4 for 40 in th previous post)
Ciao

Distributive-associative-commutative-properties/505412: i have worked this problem 5 times and come back to 0 each time, but the teacher marks it wrong..Please help me understand what I am doing wrong.Thank you very much.'
40/5(3-1)-4 Original Problem and below is my work / = divide
40/5x2-4
40/10=4
4-4=0
1 solutions

Answer 339887 by Taxie(4) on 2011-09-27 16:50:49 (Show Source):

You can put this solution on YOUR website!
40/5=8
So. 40/5x2 = 8x2=16, else your teacher would have written 40/(5x2)
Therefore your final result is 16-4=12
Ciao!
explanation: always do operations in parentheses first, starting by the innermost in case you have nestling pairs of parentheses. However, do not put parentheses where there aren't any.
You solved this exercise wrongly because you solved it as if it were written:
40/(5(3-1)) - 4. that is you put in a non-existing parenthesis.
Ciao from Italy

Travel_Word_Problems/505427: (At 10:00 A.M., a car leaves a house at a rate of 60 mi/h. At the same time, another car leaves the same house at a rate of 50 mi/h in the opposite direction. At what time will the cars be 330 miles apart?)<<< How do you do this kind of algebra questions. Please help me, I don't get this and my teacher is going over it so fast! Please.
1 solutions

Answer 339883 by Taxie(4) on 2011-09-27 16:34:33 (Show Source):

You can put this solution on YOUR website!
the two cars will be 330 mi apart after 3 hours, because they will move 50+60=110 miles each hour awy from each other, and 330/110 = 3

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Recent problems solved by 'Taxie'