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# Recent problems solved by 'Alan3354'

Alan3354 answered: 34649 problems
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 Exponential-and-logarithmic-functions/465421: 7-3 1 solutions Answer 318947 by Alan3354(34674)   on 2011-06-28 18:37:29 (Show Source): You can put this solution on YOUR website!7 - 3 = 4
 Geometry_Word_Problems/465384: a glass sphere holds .5 gallons of water. how much water does another sphere hold if its diameter is 4 times as large? a. 24.7 gal b.32 gal c. 8 gal. d. 2 gal1 solutions Answer 318939 by Alan3354(34674)   on 2011-06-28 18:03:26 (Show Source): You can put this solution on YOUR website!If the radius = 4x, the volume is the cube of 4, = 64x --> 32 gallons
 test/465385: how to solve each system by graphing? problems: 1) y= 7x + 4 and y= -x - 4 2) 2x + y = 3 and x - 2y = 4 3) x - 3y = - 9 and x - 3y = 61 solutions Answer 318938 by Alan3354(34674)   on 2011-06-28 18:02:08 (Show Source): You can put this solution on YOUR website!They're straight lines, so you need 2 points for each equation. Pick values for x and find y. Plot the 2 points. Draw a line thru them. The solution of the system is where the lines intersect.
 test/465426: solve a system by elimination? problem: -3 + 6y = -9 5x - 6y = 191 solutions Answer 318937 by Alan3354(34674)   on 2011-06-28 18:01:19 (Show Source): You can put this solution on YOUR website!Add the 2 equations.
 test/465425: how to solve a system by graphing? problem: x - 3y = -9 x - 3y = 61 solutions Answer 318935 by Alan3354(34674)   on 2011-06-28 18:00:45 (Show Source): You can put this solution on YOUR website!They're straight lines, so you need 2 points for each equation. Pick values for x and find y. Plot the 2 points. Draw a line thru them. The solution of the system is where the lines intersect. ----------- If the lines are parallel, there's no intersection --> no solution. ------------ dl the FREE graph software at http://www.padowan.dk Use F6 to enter the equations as they are.
 test/465423: how to solve a system by graphing? problem: 2x + y = 3 x - 2y = 41 solutions Answer 318933 by Alan3354(34674)   on 2011-06-28 17:59:30 (Show Source): You can put this solution on YOUR website!They're straight lines, so you need 2 points for each equation. Pick values for x and find y. Plot the 2 points. Draw a line thru them. The solution of the system is where the lines intersect.
 test/465422: how to solve a system by graphing? problem: y= 7x + 4 y= -x - 41 solutions Answer 318932 by Alan3354(34674)   on 2011-06-28 17:59:15 (Show Source): You can put this solution on YOUR website!They're straight lines, so you need 2 points for each equation. Pick values for x and find y. Plot the 2 points. Draw a line thru them. The solution of the system is where the lines intersect.
 Travel_Word_Problems/465333: The range of a projectile is directly proportional to the square of its velocity. If a motorcyclist can make a jump of 237.2 feet by coming off a ramp at 79mph, find the distance the motorcylist could expect to jump if the speed coming off the ramp were increased to 84mph. Round to the nearist tenth of a foot.1 solutions Answer 318891 by Alan3354(34674)   on 2011-06-28 15:59:39 (Show Source): You can put this solution on YOUR website!The range of a projectile is directly proportional to the square of its velocity. If a motorcyclist can make a jump of 237.2 feet by coming off a ramp at 79mph, find the distance the motorcylist could expect to jump if the speed coming off the ramp were increased to 84mph. Round to the nearist tenth of a foot. -------------- k = 237.2/6241 --------------- d = k*84^2 = 7056k d = 237.2*7056/6241 d =~ 268.2 feet
 Surface-area/465280: How many yards of cement in 12 8" x 48" cylender with a 4"x4"x48" post in nthe middle. How many bags of cement1 solutions Answer 318853 by Alan3354(34674)   on 2011-06-28 14:11:36 (Show Source): You can put this solution on YOUR website!If 8 inches is the diameter of the 8" x 48" cylinders, the volume of each is cubic inches 12V = 4608*pi cu inches =~ 14477 cubic inches. ----------------- The volume of the post is 4*4*48 cu inches = 768 cu inches 12*768 = 9216 cubic inches If you're putting 12 posts in 12 holes, the volume of cement for all 12 is 14477 - 9216 = 5261 cubic inches. 1 cubic yard = 36*36*36 cubic inches = 46656 cu in ---------------- 5261/46656 =~ 0.113 cubic yards
 Travel_Word_Problems/465140: how many km can a car travel in 2 hours if its speed is 40km/h 1 solutions Answer 318766 by Alan3354(34674)   on 2011-06-28 10:09:45 (Show Source): You can put this solution on YOUR website!Hint: In 1 hour, it goes 40 km. In another hour, it goes another 40 km.
 Rate-of-work-word-problems/464962: how long does it take to paint 200 lf of 1 1/2 inch diameter pipe railing? 1 solutions Answer 318678 by Alan3354(34674)   on 2011-06-27 21:59:26 (Show Source): You can put this solution on YOUR website!It depends on how fast you work, and how many are painting.
 Linear-equations/465091: y=3-x 1 solutions Answer 318677 by Alan3354(34674)   on 2011-06-27 21:57:48 (Show Source): You can put this solution on YOUR website!Do you have a question?
 Number-Line/465038: Why is the line x=4 is considered a verticle line? why is x always vertical and y is always horizontal? 1 solutions Answer 318652 by Alan3354(34674)   on 2011-06-27 21:00:35 (Show Source): You can put this solution on YOUR website!x horizontal and y vertical are arbitrary assignments. When we do 3-space graphs (x-y-z) usually z is vertical. ------------- If the orientation of the x-y plane is such that y is vertical, then x=4 is vertical, since it's parallel to the y-axis.
 Human-and-algebraic-language/464994: The sum of 3 consecutive even integers in 6,000. what is the least integer of the three1 solutions Answer 318545 by Alan3354(34674)   on 2011-06-27 16:52:15 (Show Source): You can put this solution on YOUR website!6000/3 = 2000, the middle integer --> 1998, 2000 & 2002
 Exponential-and-logarithmic-functions/464911: solve for x: 2^(2x) + 2^(x+2) - 12 = 0, I believe logarithms are needed.1 solutions Answer 318483 by Alan3354(34674)   on 2011-06-27 13:45:23 (Show Source): You can put this solution on YOUR website!x = 1 ---------- The hard way: Sub y for 2^2 (y+6)*(y-2) = 0 y = 2^x = -6, 2 Ignore the -6 2^x = 2 x = 1
 Radicals/464857: I'm having trouble simplifying this problem and have to write out how it is done. Any help would be great. 16.5sqrt(100)1 solutions Answer 318450 by Alan3354(34674)   on 2011-06-27 10:53:26 (Show Source): You can put this solution on YOUR website!Hint:
 Permutations/464855: How many permutations are there if the letters PNRCSE are taken six at a time?1 solutions Answer 318449 by Alan3354(34674)   on 2011-06-27 10:48:30 (Show Source): You can put this solution on YOUR website!The 1st choice is 1 of 6, then 1/5, 1/4, etc --> 6! = 720
 Word_Problems_With_Coins/464850: Please answer this question, Thanks. Find y if yˆ2-20=380 or in other words: find y if y squared minus 20 equals 380 Thanks(:1 solutions Answer 318446 by Alan3354(34674)   on 2011-06-27 10:41:21 (Show Source): You can put this solution on YOUR website!Find y if yˆ2-20=380 ----------- Add 20 y = 20 y = -20
 Trigonometry-basics/464839: graph two periods of the given cosecant and secant function Y= 3 sec x1 solutions Answer 318443 by Alan3354(34674)   on 2011-06-27 10:26:40 (Show Source): You can put this solution on YOUR website!dl the FREE graph software at http://www.padowan.dk ----------- Click INS, enter 3sec(x)
 Divisibility_and_Prime_Numbers/464719: It is correct that 3721164=12*17^2*29*37. Give the prime factorization of 372116400 (two zeros are underlined in problem). Notice the two extra zeros. I really need help, and would appreciate your help!1 solutions Answer 318377 by Alan3354(34674)   on 2011-06-26 22:13:32 (Show Source): You can put this solution on YOUR website!It is correct that 3721164=12*17^2*29*37. Give the prime factorization of 372116400 (two zeros are underlined in problem). ----------- 3721164=12*17^2*29*37 372116400=12*17^2*29*37*100 372116400=12*17^2*29*37*2*2*5*5
 Rectangles/464692: Factor the polynomial completely. (If it is not factorable using integers, enter NF.) 9n^2+251 solutions Answer 318353 by Alan3354(34674)   on 2011-06-26 20:52:30 (Show Source): You can put this solution on YOUR website!nf
 Matrices-and-determiminant/464638: How to write the determinants D, Dx, and Dy for the system given. but Do not solve. {2x + 5y = 7 {-3x + 4y = 1 1 solutions Answer 318321 by Alan3354(34674)   on 2011-06-26 19:29:44 (Show Source): You can put this solution on YOUR website!duplicate
 Matrices-and-determiminant/464639: Solve the system using Cramer's rule. 4x + y = -11 3x - 5y = -60 I came up with the answer -5,9 but i'm not sure it's right1 solutions Answer 318320 by Alan3354(34674)   on 2011-06-26 19:29:04 (Show Source): You can put this solution on YOUR website!If you sub for x & y, you'll see it's right.
 Linear_Algebra/464611: If the length plus the width of a rectangle ABCD is 8. What is the length of the diagonal AC?1 solutions Answer 318310 by Alan3354(34674)   on 2011-06-26 18:47:09 (Show Source): You can put this solution on YOUR website!If the length plus the width of a rectangle ABCD is 8. What is the length of the diagonal AC? ---------------- Not enough data. If it's a square, 4 by 4, the diagonal is =~ 5.65685 (the minimum) If it's 1 by 7, the diagonal is =~ 7.0711 If it's 0.1 by 7.9, the diagonal is =~ 7.9006 ------------ There are an infinite # of possibilities.
 Equations/464606: The equation y=-1777x+27,153 can be used to predict the number y of gun deaths in the U.S. x years after 2000,that is,x=0 corresonds to 2000,x=2 corresonds to 2002,x=6 corresonds to 2006, and so on. Predict the number of gun deaths in 2006 and 2009. In wagt year will the number of gun deaths be 9383? The predicted gun deaths in 2006 will be? the predicted gun deaths in 20069 will be? The predicted number of gun deaths will be 9383 in the year?1 solutions Answer 318309 by Alan3354(34674)   on 2011-06-26 18:41:13 (Show Source): You can put this solution on YOUR website!Making up a formula doesn't mean anyone can predict the future. --------------- •Homicide: 11,624 / 39% of All Fatalities •Suicide: 16,750 / 57% of All Fatalities •Unintentional Death (Accidental): 649 / 2% of All Fatalities ------------- A total of 28843 ----------------------- A sad, but interesting, fact is that homocide is the #1 cause of death of pregnant women in the US (not necessarily from guns).
 Travel_Word_Problems/464651: The speed of sound and water is about 1500m/sec. If a receiver on a ship receives an echo from the bottom 3 seconds after it is transmitted then the depth of the ocen is ----- meters? The way I tried to do it was by multiplying 1500 by 3 to get 4500 meters, but I am not sure about that answer and want to get another opinion. Thanks!1 solutions Answer 318308 by Alan3354(34674)   on 2011-06-26 18:34:16 (Show Source): You can put this solution on YOUR website!The speed of sound and water is about 1500m/sec. If a receiver on a ship receives an echo from the bottom 3 seconds after it is transmitted then the depth of the ocen is ----- meters? --------------------------- The speed of sound in water, right? It takes 3 seconds to travel to the bottom, then back to the ship. 1500 m/sec * 3 sec = 4500 meters round trip depth = 4500/2 = 2250 meters. Make sense? 1.5 seconds to the bottom, 1.5 seconds back to the ship
 Linear-equations/464657: 2y-x+2andy=-2x+41 solutions Answer 318307 by Alan3354(34674)   on 2011-06-26 18:30:18 (Show Source): You can put this solution on YOUR website!Is that "and y" or someone named Andy? Do you mean + y ?? Also, what is your question? ----------------- You want us to help you, no charge, but you don't have time to make sense.
 expressions/464660: Need help with two step algebra problems. -2X- 3 over = 117over5 not sure where 2 start thnk you 4 your time1 solutions Answer 318306 by Alan3354(34674)   on 2011-06-26 18:28:36 (Show Source): You can put this solution on YOUR website!It can't be "over ="
 Polynomials-and-rational-expressions/464584: Find all values of k so each trinomial can be factored using integers. x to the second power +kx+10 1 solutions Answer 318305 by Alan3354(34674)   on 2011-06-26 18:10:21 (Show Source): You can put this solution on YOUR website!Find all values of k so each trinomial can be factored using integers. 10 = 1*10 or 2*5 (+ and minus) (x+1)*(x+10) = x^2 + 11x + 10 --> 11 & -11 ---------------- (x+2)*(x+5) = x^2 + 7x + 10 --> 7 & -7
 Matrices-and-determiminant/464642: Solve using Cramer's Rule. x + 3y + 5z = 6 2x - 4y + 6z = 14 9x - 6y + 3z = 3 I came up with (1,-2,1) but Cramers rule confuses me so I don't know if I did it right1 solutions Answer 318299 by Alan3354(34674)   on 2011-06-26 17:05:27 (Show Source): You can put this solution on YOUR website!http://www.analyzemath.com/Calculators/Calculator_syst_eq.html
 Age_Word_Problems/464538: Pat is older than Lee, and Lee is younger than Maria. Is Maria's age greater or Pats age greater? 1 solutions Answer 318276 by Alan3354(34674)   on 2011-06-26 13:34:05 (Show Source): You can put this solution on YOUR website!Pat and Maria are older than Lee. There's no way to determine the difference between Pat's and Maria's ages.