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# Recent problems solved by 'Alan3354'

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 Numbers_Word_Problems/501013: what equation has the number 1,4,5,6 and equals 24 1 solutions Answer 338380 by Alan3354(31517)   on 2011-09-20 11:37:02 (Show Source): You can put this solution on YOUR website!What does "has the number..." mean?
 Trigonometry-basics/501011: solve 6+|-13|1 solutions Answer 338379 by Alan3354(31517)   on 2011-09-20 11:31:48 (Show Source): You can put this solution on YOUR website!solve 6+|-13| Solve for what? There's no variable. -------------- It can be simplified some = 6 + 13 = 19
 Square-cubic-other-roots/501010: How do you simplify square root of 6 times square root of 14?1 solutions Answer 338378 by Alan3354(31517)   on 2011-09-20 11:30:21 (Show Source): You can put this solution on YOUR website!How do you simplify square root of 6 times square root of 14? -------- = =
 Travel_Word_Problems/500987: A car is driven 360 miles in 8 hours? What is the rate in miles per hour?1 solutions Answer 338376 by Alan3354(31517)   on 2011-09-20 11:24:01 (Show Source): You can put this solution on YOUR website!d = r*t r = d/t
 Numeric_Fractions/500794: yolanda spends 8 2/3 hours per month playing soccer approxinately how many hours does she play soccer in a year 1 solutions Answer 338296 by Alan3354(31517)   on 2011-09-19 23:25:27 (Show Source): You can put this solution on YOUR website!8 2/3 times 12
 Triangles/500829: how do i find the area of a triangle whose sides are 12 meters long? 1 solutions Answer 338295 by Alan3354(31517)   on 2011-09-19 23:23:22 (Show Source): You can put this solution on YOUR website!Find the height. Then area = b*h/2
 Expressions-with-variables/500818: a neg r over 4 = 1 over 7 I know I have to get 5 by itself do I divide it by 4/1 and do the same on the other side and does the negative follow the 4/1 making the answer r = -4/7 1 solutions Answer 338290 by Alan3354(31517)   on 2011-09-19 22:48:14 (Show Source): You can put this solution on YOUR website!-r/4 = 1/7 Multiply by 4 -r = 4/7 r = -4/7
 Probability-and-statistics/500816: Boating If the equilibrium point is y=0, then y=-5cos(πt/6) model a buoy bobbing up and down in the water. 1 solutions Answer 338289 by Alan3354(31517)   on 2011-09-19 22:46:10 (Show Source): You can put this solution on YOUR website!Ok. Do you have a question?
 Numeric_Fractions/500784: what is the least common denomintor of 3/4 4/5 2/3 ? 1 solutions Answer 338288 by Alan3354(31517)   on 2011-09-19 22:40:06 (Show Source): You can put this solution on YOUR website!4*5*3 = 60
 Numeric_Fractions/500815: At full production, a car rolls of the assembly line every 2/3 hour. At this rate, how long does it take to produce 30 cars? 30/1 / 2/3 broke it down to 10/1 x 2/1 =20? Is this correct?1 solutions Answer 338286 by Alan3354(31517)   on 2011-09-19 22:38:52 (Show Source): You can put this solution on YOUR website!At full production, a car rolls of the assembly line every 2/3 hour. At this rate, how long does it take to produce 30 cars? 30/1 / 2/3 broke it down to 10/1 x 2/1 =20? Is this correct? ------------------ 20 hours is correct. ---------- Typically, cars roll off assembly lines about one per minute, not 40 minutes.
 Problems-with-consecutive-odd-even-integers/500808: if the sum of three consecutive odd integers is 69, what is the third of the three odd integers?1 solutions Answer 338285 by Alan3354(31517)   on 2011-09-19 22:37:01 (Show Source): You can put this solution on YOUR website!69/3 = 23 --> 21, 23 & 25
 Trigonometry-basics/500807: A pully of radius 7cm rotates 15 times in 128 sec. Find the angular velocity of the pulley.1 solutions Answer 338284 by Alan3354(31517)   on 2011-09-19 22:34:03 (Show Source): You can put this solution on YOUR website!15 revs = 5400 degrees 5400 degs/128 sec = 42.1875 deg/sec ------------ 15 rev = 30pi radians 30pi/128 = 0.234375pi radians/sec -------- The size of the pulley is not relevant.
 Expressions-with-variables/500726: I can not figure out this problem. x-5 over x+4 equals x-4 over x+6 solve for x. x-5 x-4 --- = ---- x+4 x+6 solve for x I have been working on this problem for hours. These are fractions, I tried to display them the best way I could. Can you please help me?1 solutions Answer 338257 by Alan3354(31517)   on 2011-09-19 21:27:06 (Show Source): You can put this solution on YOUR website!x-5 over x+4 equals x-4 over x+6 solve for x. -------- Cross multiply (x-5)*(x+6) = (x+4)*(x-4) x-30 = -16 x = 14
 Geometry_Word_Problems/500738: Find the sum of the measures of the exterior angles, one at each vertex, of a convex octagon. 1 solutions Answer 338254 by Alan3354(31517)   on 2011-09-19 21:24:28 (Show Source): You can put this solution on YOUR website!The sum of exterior angles of ALL polygons is 360 degrees.
 Problems-with-consecutive-odd-even-integers/500740: the sum of 4 consecutive odd integers is 432. What are the numbers?1 solutions Answer 338253 by Alan3354(31517)   on 2011-09-19 21:23:08 (Show Source): You can put this solution on YOUR website!432/4 = 108, the center --> 105, 107, 109 & 111
 Travel_Word_Problems/500747: If a plane is traveling at 550mph how far would it get in a 1 and 45 mintues? 1 solutions Answer 338252 by Alan3354(31517)   on 2011-09-19 21:22:15 (Show Source): You can put this solution on YOUR website!d = r*t distance = rate * time
 real-numbers/500607: find the remaining zeros of f. Degree 6; zeros: -7, 5, 7 - 5i, -5 + i1 solutions Answer 338198 by Alan3354(31517)   on 2011-09-19 19:31:18 (Show Source): You can put this solution on YOUR website!+5i and -5-i
 test/500561: why did erenst attract so little attention1 solutions Answer 338180 by Alan3354(31517)   on 2011-09-19 18:40:54 (Show Source): You can put this solution on YOUR website!I didn't notice that.
 Linear-equations/500569: find x x/20 where x is 3/5 i dont understand why the answer is 12 could u please explain1 solutions Answer 338179 by Alan3354(31517)   on 2011-09-19 18:40:19 (Show Source): You can put this solution on YOUR website!You say x is 3/5 ??
 Exponents/500572: How do i find the solution to my problem, when there is two numbers with variables ?1 solutions Answer 338178 by Alan3354(31517)   on 2011-09-19 18:38:52 (Show Source): You can put this solution on YOUR website!Depends on the problem.
 Numbers_Word_Problems/500571: what are two even consecutive intergers that add to a sum of 45?1 solutions Answer 338177 by Alan3354(31517)   on 2011-09-19 18:38:26 (Show Source): You can put this solution on YOUR website!2 even numbers don't add to an odd number. PS It's integers.
 Problems-with-consecutive-odd-even-integers/500425: how do i solve this problem find two consecutive odd integers whose sum is 1561 solutions Answer 338139 by Alan3354(31517)   on 2011-09-19 15:43:21 (Show Source): You can put this solution on YOUR website!n + n+2 = 156 -------------- Or, 156/2 = 78, the middle, or average of the 2 numbers.
 Travel_Word_Problems/500402: What is the average velocity in km/h? Answer in units of km/h1 solutions Answer 338136 by Alan3354(31517)   on 2011-09-19 14:39:04 (Show Source): You can put this solution on YOUR website!It's the distance divided by the time. d = r*t r = d/t Any units.
 Geometry_Word_Problems/500295: lol ur a tutor~!!~@!@#@ haha ^^ jk X[)!!!!Q!#@#\$#@\$^ %&Y& ^%& %\$%^@#E#%^%&Y%&Y^U^**omfg wtf kssdl;fjjklhsdfahhhhhhhhhhhhhhhh! zom l0lllllllll1 solutions Answer 338126 by Alan3354(31517)   on 2011-09-19 13:31:16 (Show Source): You can put this solution on YOUR website!That's the most clever thing I've seen in awhile. You must be very intelligent.
 Travel_Word_Problems/500351: I need to know the formula to get this answer. Mike drove uphill to his school and it took 3 hours. He returned downhill only going 5mph faster and made it in two hours. What is the average rate of speed?1 solutions Answer 338125 by Alan3354(31517)   on 2011-09-19 13:28:09 (Show Source): You can put this solution on YOUR website!I need to know the formula to get this answer. d = r*t is the formula -------------- Mike drove uphill to his school and it took 3 hours. He returned downhill only going 5mph faster and made it in two hours. What is the average rate of speed? -------------- d = r*t d = r*3 d = (r+5)*2 3r = 2(r+5) r1 = 10 mi/hr uphill r2 = 15 mi/hr downhill ------------- Here's a formula: avg speed = 2*r1*r2/(r1 + r2) = 2*10*15/25 = 300/25 = 12 mi/hr -------------- Notice that the distance is irrelevant, but they have to be equal for the formula to apply. -------------- A different method, without the formula: d = 10*3 = 30 miles round trip = 60 miles Total time = 3 hr + 2 hr = 5 hours Avg speed = 60/5 = 12 mi/hr same answer ----------------------------
 Miscellaneous_Word_Problems/500355: How many pounds of 80-cent nuts and how many pounds of 50-cent nuts must a dealer use to produce a mixture of 90-pounds to sell at 75-cents per pound?1 solutions Answer 338124 by Alan3354(31517)   on 2011-09-19 13:18:26 (Show Source): You can put this solution on YOUR website!Do it like this one: ---------- how many liters of a 70% acid solution must be mixed with a 15% acid solution to get 385L of a 60% acid solution? ------------------- s = amount of 70% f = amount of 15% ------- s + f = 385 (total solution) 0.7s + 0.15f = 0.6*385 (total acid) ------- f = 385 - s Sub for f in 2nd equation 0.7s + 0.15(385-s) = 231 70s + 5775 - 15s = 23100 55s = 17325 s = 315 liters of 70% ------------ f = 70
 Rectangles/500357: a chemist has one solution that is 30% pure salt and another is 60% pure salt. How many ouc=nces of each solution must he use to produce 60 ounces of a solution that is 50% pure salt?1 solutions Answer 338123 by Alan3354(31517)   on 2011-09-19 13:17:54 (Show Source): You can put this solution on YOUR website!Do it like this: ------------ how many liters of a 70% acid solution must be mixed with a 15% acid solution to get 385L of a 60% acid solution? ------------------- s = amount of 70% f = amount of 15% ------- s + f = 385 (total solution) 0.7s + 0.15f = 0.6*385 (total acid) ------- f = 385 - s Sub for f in 2nd equation 0.7s + 0.15(385-s) = 231 70s + 5775 - 15s = 23100 55s = 17325 s = 315 liters of 70% ------------ f = 70
Complex_Numbers/500366: what to solve x^2+8x-4=0 by using the quadratic formula

1 solutions

Answer 338122 by Alan3354(31517)   on 2011-09-19 13:16:09 (Show Source):
You can put this solution on YOUR website!
what to solve x^2+8x-4=0 by using the quadratic formula
Solve for x, I suppose.
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 Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) 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=80 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 0.47213595499958, -8.47213595499958. Here's your graph:

 Volume/500371: If the height of the pyramid is 4 cm, what is the volume of the pyramid?1 solutions Answer 338121 by Alan3354(31517)   on 2011-09-19 13:14:46 (Show Source): You can put this solution on YOUR website!It's 4*base area/3 Still
 Volume/500370: If the height of the pyramid is 4 cm, what is the volume of the pyramid?1 solutions Answer 338120 by Alan3354(31517)   on 2011-09-19 13:14:23 (Show Source): You can put this solution on YOUR website!It's 4*base area/3
 Average/500285: If I have 17 questions, and miss five, what is the average? 1 solutions Answer 338098 by Alan3354(31517)   on 2011-09-19 10:15:47 (Show Source): You can put this solution on YOUR website!Missing 5 of 17 gives a score of 12/17 =~ 70.6% Not sure what you mean by "average."