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Recent problems solved by 'rwm'
rwm answered: 913 problems
Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929, >>NextEquations/462062: A motorboat leaves Galveston, TX. One-half hour after the boat leaves, a second boat leaves Galveston following the first boat. The first boat is traveling at 25 mph, while the second boat travels at 35 mph. How long will it take the second boat to over take the first boat?
1 solutions
Answer 316794 by rwm(914)   on 2011-06-17 14:33:36 (Show Source):
You can put this solution on YOUR website!basically the first boat got ahead by 12.5 miles
the second boat gains on the first boat at 10 mph.
how long will it take the second boat to go 12.5 miles gaining at 10 mph
r*t=d
25*(t+1/2)=35t
25t+12.5=35t
12.5=10t
1.25=t
1 hour 15 minutes
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Linear-equations/461913: the value v of a shopkeepers inventory software program, in hundreds of dollars is given by:
v=(-3/4)t+6
where t is the number of years since the shopkeeper first bought the program.
Graph the equation and use the graph the estimate what the program is worth 4 years after it was first purchased.
Tell me where to graph the numbers and i can do it on my own graph
1 solutions
Answer 316752 by rwm(914) on 2011-06-17 08:50:10 (Show Source):
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Travel_Word_Problems/461914: At 2:00 p.m. Jason & Sharon drive (without stops) in the same direction @ 60 miles/hour and 56 miles/hour, respectively, to visit Gertrude in Baton Rouge. @ 2:45 p.m. Jason passes Sharon. How many miles is the gap between Jason and Sharon?
1 solutions
Answer 316751 by rwm(914) on 2011-06-17 08:44:39 (Show Source):
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Mixture_Word_Problems/461979: A chemist wants to mix some pure acid with some water to produce 16 L of a solution that is 30% acid. How much pure acid and how much water should be mixed?
1 solutions
Answer 316750 by rwm(914) on 2011-06-17 08:31:06 (Show Source):
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Travel_Word_Problems/461917: Zipporah and Joshua ride their bikes in opposite directions: Zipporah @ 28 miles/hour and Joshua @ 24 miles/hour. In 15 miles, How many miles will they be apart?
1 solutions
Answer 316749 by rwm(914) on 2011-06-17 08:21:35 (Show Source):
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Money_Word_Problems/461945: $19187 is invested, part at 9% and the rest at 8%. If the interest earned from the amount invested at 9% exceeds the interest earned from the amount invested at 8% by $417.15, how much is invested at each rate?
1 solutions
Answer 316746 by rwm(914) on 2011-06-17 07:50:39 (Show Source):
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Quadratic_Equations/461813: 1. 2x^2+5x-3=0
1 solutions
Answer 316622 by rwm(914) on 2011-06-16 16:39:24 (Show Source):
You can put this solution on YOUR website!One problem ata time.
Really? Yes, you are not the only one who wants urgent help.
2x^2+5x-3=0
you want factors of -6 that add up to 5
6 and -1
2x^2+6x-1x-3=0
2x*(x+3)-1*(x+3)=0
(2x-1)*(x+3)=0
x=1/2
x=-3
| Solved by pluggable solver: SOLVE quadratic equation with variable |
Quadratic equation  (in our case  ) has the following solutons:
For these solutions to exist, the discriminant  should not be a negative number.
First, we need to compute the discriminant :  .
Discriminant d=49 is greater than zero. That means that there are two solutions:  .
Quadratic expression  can be factored:
Again, the answer is: 0.5, -3.
Here's your graph:
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Linear-systems/461823: solve by elimination
4x+5y=5
8x+10y=10
Am i suppose to put this into y=mx+b form ?
1 solutions
Answer 316621 by rwm(914) on 2011-06-16 16:32:20 (Show Source):
You can put this solution on YOUR website!no multiply the first by 2 and you will see that it is the same as the second.
They are the same line.
So there are infinite solutions to this .
All x's and y's match.
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Geometry_Word_Problems/461819: if two angles of a triangle are equal ant the measure of the thrd angle is 4 degress less than twice of eache of the other angels what is the measure of the largest angle?
1 solutions
Answer 316619 by rwm(914) on 2011-06-16 16:27:37 (Show Source):
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Quadratic_Equations/461800: Hi
I hate to bother you all again but this morning I asked help in this problem and no one has answered me, please someone help me.
1 solutions
Answer 316611 by rwm(914) on 2011-06-16 15:32:42 (Show Source):
You can put this solution on YOUR website!Do not submit the same problem in more than one category nor twice in 24 hours.
you are not the only one here.
I saw your problem but bypassed it because it isn't clear what are the numerators and denominators.
We are not mind readers.
Use plenty of parentheses or graphics to clarify.
If you wish to send me the problem with clarifications, I will take a look.
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Linear_Equations_And_Systems_Word_Problems/461796: Please help with this problem.
Ricks Pain Store sells a special shade of paint (Rick's Blush) which can be made from red paint and white paint. The amount of red paint should be three times the amount of white paint. How much of each kind of paint is needed to make 264 gallons of Ricky's Blush?
I have no idea to where to begin. When I read the problem I wrote this down....
R= red paint
W= white paint
3R + W = 264
1 solutions
Answer 316605 by rwm(914) on 2011-06-16 15:21:36 (Show Source):
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Evaluation_Word_Problems/461775: Please answer this question, It says to just solve the problem:
4 over 5x equals 4 over x plus 8
or in other words: __4__ = __4__
5x x+8
Thanks!!
1 solutions
Answer 316593 by rwm(914) on 2011-06-16 14:55:42 (Show Source):
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Linear_Equations_And_Systems_Word_Problems/461736: Jenny has 8 books overdue at the library. She remembers that she checked out 3 math books 2 weeks before she checked out 5 children's books. The daily fine per book is $0.15. If her total fine was $9.90, how long was each book overdue?
1 solutions
Answer 316592 by rwm(914) on 2011-06-16 14:50:55 (Show Source):
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Linear_Equations_And_Systems_Word_Problems/461741: "Jenny has 8 books overdue at the library. She remembers that she checked out 3 math books two weeks before she checked out 5 children's books. The daily fine per book is $0.15. If her total fine was $9.90, how long was each book overdue?
1 solutions
Answer 316587 by rwm(914) on 2011-06-16 14:35:43 (Show Source):
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Graphs/461756: Hello,
I'm having difficulties setting up this word problem:
Sam bought 50 stamps at 14 and 22 cents each. He paid the postal clerk
$10.04. How many 22-cent stamps did he buy?
I tried to set the problem up like this:
x+y=50 letting the x=14 and y=22
y=x-50
14x + 22y = 50
14x + 22(50-x)=50
14x + 1100 -22x = 50
-8x = -1050
-8x/-8 = -1050/8
x= 131.25
Not sure where I went wrong. I appreciate any help. Thank you.
1 solutions
Answer 316585 by rwm(914) on 2011-06-16 14:30:24 (Show Source):
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Probability-and-statistics/461728: I just need someone to tell me if I did these correctly before I submit my homework.
7. Of the 100 people who were given a new sleeping aid, 30 experienced a light headache, 18 experienced a reduced appetite, and 60 experienced neither side-effect. How many people experienced both a light headache and a reduced appetite?
60-48= 12?
8. A quiz consists of 6 multiple-choice questions, each has three possible answers. In how many different ways can the quiz be answered if one answer is chosen for each question?
3^6?
9. A code consists of two letters chosen from the English alphabet, followed by 4 digits. If the first letter must be a K or an M, the second letter can be any one of the 26 letters, how many different codes are possible?
I dont know how to even set this one up...
10. In how many ways can two math books and three English books be arranged in a row if the two math books must be placed next to each other?
2^3?
1 solutions
Answer 316576 by rwm(914) on 2011-06-16 13:13:39 (Show Source):
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Numeric_Fractions/461732: How would you sketch the fraction 12/8?
In the problem we are asked to visually show through a drawing how the fractions 2/3 and 12/8 are equal. Please Help!
I would greatly appreciate it!!! Some of the problems show a context that we could use for our drawings. For example one had Popsicle sticks, marbles, and for this problem we have to make one of our own. I already sketched 2/3 using flowers as the context.
1 solutions
Answer 316575 by rwm(914) on 2011-06-16 13:08:32 (Show Source):
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Inequalities/461731: Factor each problem completely. Remember to place the Greastest Common Factor, if its other than 1, outside parentheses first.
2x^2 + 40x + 200
1 solutions
Answer 316573 by rwm(914) on 2011-06-16 13:04:33 (Show Source):
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