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Equations/261931: I am trying to help my son with his homework and am stuck!
We need to find the solution for this problem:
2/c^2-2c + 1/2-c=1
1 solutions
Answer 193028 by richwmiller(9135)   on 2010-01-27 18:07:27 (Show Source):
You can put this solution on YOUR website!
Please verify that is what it should be.
It is possible but unlikely that is the true equation
It is unusual to have c^2 in the denominator and it is also unusual to have -2c and -c in the same equation.
This equation will involve c^3 and have one real solution and two imaginary (complex) solutions.
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Miscellaneous_Word_Problems/261919: The owner of a bicycle shop report his inventory of bicycles and tricycles in an unusual way. He said he counted 126 wheels and 108 pedals. How many bikes and how many trikes did he have?
How would I setup and equation to solve this word problem.
1 solutions
Answer 193022 by richwmiller(9135) on 2010-01-27 17:59:21 (Show Source):
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Linear_Algebra/261910: Not sure if this is the right place. I have 2 questions:
1) bx - cx = -c How do I solve these? Thanks a lot!!!
2) 2/5 (x + 1) = g
1 solutions
Answer 193012 by richwmiller(9135) on 2010-01-27 17:35:30 (Show Source):
You can put this solution on YOUR website!1)
Can't be solved because there are three variables and only one equation.
We could solve for one of the variable in terms of another but you didn't ask for
that.
2)
Similar problem here two variables and only one equation.
Reminder of website rules
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no similar problems
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Include all known info including any answers
Tell us what you have tried and where you are stuck
Don't try to BS.
We know many of you are just trying to get us to do your homework
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Geometry_proofs/261883: The Question says:
Given: segment AB is parallel to segment DC;
segment BC is parallel to segment AE
Prove: BC/EA = BD/EB
I dont understand how to do proofs
1 solutions
Answer 193006 by richwmiller(9135) on 2010-01-27 17:21:45 (Show Source):
You can put this solution on YOUR website!You are going to have a fun time in Geometry if you don't know how to do proofs.
BTW one of the reasons for teaching geometry is to develop your ability to think logically. You have to learn how to think to do proofs.
Start with what you know and move on to what you didn't know step by step.
If you can't follow what I am saying there is not much point in explaining the problem.
I assume you are in the second semester of geometry now. It is a bit late to say you don't get proofs.
You have to bring together everything you should have learned about parallel lines and proportions.
I suspect there was a drawing that you neglected to mention.
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Length-and-distance/261899: how do i do this and what is the answer? how many 3/4 foot pieces of string can be cut from a piece of string 4 1/2 feet long
1 solutions
Answer 192990 by richwmiller(9135) on 2010-01-27 16:55:40 (Show Source):
You can put this solution on YOUR website!remember that dividing by a fraction is the same as multiplying by its reciprocal
lets convert 4 1/2 to an improper fraction.9/2
9/2*4/3=3*2=6
We also could have used decimals.
4.5/.75
2*.75=1.5
6*.75=4.5
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Linear-equations/261893: Write an equation in standard form using only integers for the line described.
A line parallel to 5x-7y=35 (6,1)
(the correct answer is 5x-7y=23)
1 solutions
Answer 192977 by richwmiller(9135) on 2010-01-27 16:37:45 (Show Source):
You can put this solution on YOUR website!5x-7y=23 is only one of many possible answers.
5x-7y=35
-7y=-5x+35
y=-5x/-7-5
y=5x/7-5
slope is 5/7
y=mx+b
1=5/7*6+b
1=30/7+b
1-30/7=b
-23/7=b
y=5x/7=23/7
We must use integers not fractions
7y=5x-23
23=5x-7y
5x-7y=23
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Circles/261886: A light in a parking lot illuminates a circular area 15 meters across. What is the area of the parking lot covered by the light?
A=pie * r^
A=3.14(7.5)
A=23.55 sq. meters
Is this right?
1 solutions
Answer 192970 by richwmiller(9135) on 2010-01-27 16:22:16 (Show Source):
You can put this solution on YOUR website!You are making the same mistakes as last time plus one new one!
^ doesn't mean square
^2 is squared
^3 is cubed
^4 is to the fourth power
3.14 *7.5*7.5
This time you forgot to square the 7.5
which you should have written 3.14*7.5^2
and once again it is pi not pie!
so no it is not right!
3.14 *7.5*7.5
not 3.14 *7.5
You did learn to square the meters this time.
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percentage/261832: A car dealer sells a SUV for $39,000, which represents a 25% markup over the dealers cost. What was the cost of the SUV to the dealer? I am getting an answer of $29,250, but the correct answer is $31,200. How do you solve?
Thanks
1 solutions
Answer 192957 by richwmiller(9135) on 2010-01-27 16:04:09 (Show Source):
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Miscellaneous_Word_Problems/261833: Nghiep gave his mother half of his weekly earnings, and then spent half of what was left on a new shirt. He then had $32. What were his weekly earnings?
1 solutions
Answer 192951 by richwmiller(9135) on 2010-01-27 15:56:48 (Show Source):
You can put this solution on YOUR website!He doesn't make enough to bother making an equation, I know.
4*32=128. He can't afford a shirt that costs $32 on his salary. No wonder his mother takes half. He doesn't know how to shop!
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Linear-equations/261850: Find the denominators on the left side of 2x+7y=14.
1 solutions
Answer 192947 by richwmiller(9135) on 2010-01-27 15:52:24 (Show Source):
You can put this solution on YOUR website!I looked and sent out the bloodhounds and called Sherlock Holmes but there are no denominators on the left side. There aren't any anywhere to be seen. I remember. I gave then the day off. They will be back to work at 5:30 am. Bright eyed and bushy tailed.
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Mixture_Word_Problems/261860: Please help solve: a karat equals 1/24 part of gold in an alloy. (for example 9 karat gold in 9/24 gold) How many grams of a 9 karat gold must be mixed with 18 karat gold to get 200 g of 14 karat gold?
1 solutions
Answer 192933 by richwmiller(9135) on 2010-01-27 15:32:05 (Show Source):
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Surface-area/261767: Find the area of each circle. Round to the nearest tenth.
There is a drawing of a circle with a diameter of 21 ft. I divided the diameter in half to get a radius of 10.5. I then used the formula:A= pie r^.
A= pie r^
A= 3.14 (10.5)
A= 346.2ft
Did I do this right?
1 solutions
Answer 192876 by richwmiller(9135) on 2010-01-27 11:33:40 (Show Source):
You can put this solution on YOUR website!Find the area of each circle. Round to the nearest tenth.
There is a drawing of a circle with a diameter of 21 ft. I divided the diameter in half to get a radius of 10.5. I then used the formula:A= pie r^.
A= pie r^
A= 3.14 (10.5)
A= 346.2ft
Did I do this right?
Almost.
pi*r^2
not apple pie
and 3.14*10.5^2 not 3.14*10.5
also 3.14*10.5^2=346.2 ft^2 not feet
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percentage/261761: Ms Hernandez had to inverview a total of 63 households. In his assignment. He has already finished 28. What percentage of the housholds in his assignments has he finished? (Round your answer to the neares tenth of a percent).
4.4%, 22.5%, 44.4%, 2.5%
Thanks for your help....
1 solutions
Answer 192871 by richwmiller(9135) on 2010-01-27 11:23:19 (Show Source):
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Circles/261758: If the tires on a car each have a diameter of 25 inches, how far will the car travel in 100 rotations of its tires?
1 solutions
Answer 192866 by richwmiller(9135) on 2010-01-27 11:15:55 (Show Source):
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