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# Recent problems solved by 'richwmiller'

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 test/261937: What are all the formulas for every area of a figure? (circles, triangles, and squares)1 solutions Answer 193030 by richwmiller(9135)   on 2010-01-27 18:09:07 (Show Source): You can put this solution on YOUR website!They are probably on the inside covers of your book.
 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=11 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.
 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): You can put this solution on YOUR website!108 pedals mean there are 54 vehicles t+b=54 3t+2b=126 t=36 b=18
 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) = g1 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 one problem per submission limit four submissions daily and no similar problems There are more rules. Suggestions Make sure you copy the problem correctly Do NOT put the problem in your own words 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
 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 proofs1 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.
 Linear-systems/261889: y=1/2x=3 and y=-3/4x-21 solutions Answer 192999 by richwmiller(9135)   on 2010-01-27 17:07:35 (Show Source): You can put this solution on YOUR website!I suspect you mean y=1/2x-3 and y=-3/4x-2 x = 2y+6 and 3x+4y+8 = 0 x = 4/5, y = -13/5
 Graphs/261892: solve for x and y 2x-y=-1 y=2x1 solutions Answer 192996 by richwmiller(9135)   on 2010-01-27 17:01:38 (Show Source): You can put this solution on YOUR website!they are parallel. so they do not cross and therefore have no solution 2x-y=-1 y=2x substitute 2x-2x=-1 0=-1 that can't be therefore there is no solution
 Numbers_Word_Problems/261902: Write an equation and solve to find three consecutive integers whose sum is 33.1 solutions Answer 192992 by richwmiller(9135)   on 2010-01-27 16:57:44 (Show Source): You can put this solution on YOUR website!The simple way is 33/3 =11 the middle one is 11 n+n+1+n+2=33 3n+3=33 3n=30 n=10 next two are 11 and 12
 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 long1 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
 Quadratic_Equations/261896: x-y=1 x+y=3 i need a pare of quardents1 solutions Answer 192985 by richwmiller(9135)   on 2010-01-27 16:49:44 (Show Source): You can put this solution on YOUR website!I give up. What is "a pare of quardents"? To solve this system of equations just add the two equations. 2x=4 x=2 2+y=3 y=1
 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
 Graphs/261890: Write the linear inequality described. Then graph the inequality: y is not negative.1 solutions Answer 192973 by richwmiller(9135)   on 2010-01-27 16:26:26 (Show Source): You can put this solution on YOUR website!y>=0 everything from y=o up including y=0
 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.
 Graphs/261884: Write the linear inequality described. Then graph the inequality: x is positive.1 solutions Answer 192965 by richwmiller(9135)   on 2010-01-27 16:14:05 (Show Source): You can put this solution on YOUR website!x>0 the graph will include everything to the right of x=0
 Polynomials-and-rational-expressions/261848: Factor.Check by multiplying 4.2x^4+5.4x^3-2.4x^2+3x type the greatest monomial factor and polynomial factor with coefficients. 1 solutions Answer 192964 by richwmiller(9135)   on 2010-01-27 16:12:20 (Show Source): You can put this solution on YOUR website!4.2x*(x+1.81669)*(x^2-0.530972x+0.393181)
 Linear-systems/261879: how to solve using substitution y=2x-3 and y=-x-31 solutions Answer 192960 by richwmiller(9135)   on 2010-01-27 16:07:52 (Show Source): You can put this solution on YOUR website!take -x-3 and substitute it for the y of the first equation to get -x-3=2x-3 add x to both sides -3=3x-3 add 3 to both sides 0=3x x=0 y=-3 (0,-3)
 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? Thanks1 solutions Answer 192957 by richwmiller(9135)   on 2010-01-27 16:04:09 (Show Source): You can put this solution on YOUR website!1.25x=39000 31200 is right 29250 is 75% of 39000 .75*39000=29250
 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!
 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.
 Inequalities/261874: What do you need to remember to do when you multiply or divide an inequality by a negative number?1 solutions Answer 192943 by richwmiller(9135)   on 2010-01-27 15:47:32 (Show Source): You can put this solution on YOUR website!I believe whoever does that must buy the next round of coffee and donuts. either that or change the signs of inequality from < to > and from > to <
 Polynomials-and-rational-expressions/261853: 9x to the third power plus one 1 solutions Answer 192939 by richwmiller(9135)   on 2010-01-27 15:39:58 (Show Source): You can put this solution on YOUR website!I am not sure if you are saying which is 9*9*9+1 or which is 9*9*9*9
 Proportions/261867: write a proportion to find the answer to 25% of what number is 30 1 solutions Answer 192934 by richwmiller(9135)   on 2010-01-27 15:35:20 (Show Source): You can put this solution on YOUR website!x/4=30 x=120 25% of 120 is 30
 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): You can put this solution on YOUR website!9/24*x+18/24(200-x)=200*14/24 x=88.89 g of 9 karat gold
 Linear-systems/261759: x+9y=79 -7x+9y=231 solutions Answer 192885 by richwmiller(9135)   on 2010-01-27 11:38:50 (Show Source): You can put this solution on YOUR website!subtract second equation from first 8x=56 x=7 7+9y=79 9y=72 y=8 (7,8)
 Coordinate-system/261769: find the slope of the line, if possible (if the line is undefined, enter undefined) the graph of x=131 solutions Answer 192881 by richwmiller(9135)   on 2010-01-27 11:36:23 (Show Source): You can put this solution on YOUR website!I answered this in your other problem . x=13 is a vertical line with undefined slope y=13 would be a horizontal line with 0 slope
 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
 Coordinate-system/261764: find the slope of the line, if possible. (if the slope is undefined, enter undefined) the graph of y=161 solutions Answer 192872 by richwmiller(9135)   on 2010-01-27 11:25:39 (Show Source): You can put this solution on YOUR website!an undefined slope would be an equation something like x=16 which is a vertical line. y=16 is a horizontal line with slope of 0
 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): You can put this solution on YOUR website!28/63=4*7/9*7=4/9 400/9= percentage 9 goes into 400 how many times? over 40 44.4%
 decimal-numbers/261762: how do you wrote four hundredths in a decimal form?1 solutions Answer 192868 by richwmiller(9135)   on 2010-01-27 11:19:29 (Show Source): You can put this solution on YOUR website!4/100=.04 4/10=.40 4=4.0 Do you see a pattern?
 Linear-systems/261757: -3x + y = 4 solve for x1 solutions Answer 192867 by richwmiller(9135)   on 2010-01-27 11:17:47 (Show Source): You can put this solution on YOUR website!-3x=4-y x=(4-y)/-3 x=-(4-y)/3
 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): You can put this solution on YOUR website!To a mechanic, rotation of tires means something else. 100*3.14*25 remember 2r=d