Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On

 Tutoring Home For Students Tools for Tutors Our Tutors Register Recently Solved
 By Tutor
| By Problem Number |

Tutor:

# Recent problems solved by 'richard1234'

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 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689 , 3690..3719 , 3720..3749 , 3750..3779 , 3780..3809 , 3810..3839 , 3840..3869 , 3870..3899 , 3900..3929 , 3930..3959 , 3960..3989 , 3990..4019 , 4020..4049 , 4050..4079 , 4080..4109 , 4110..4139 , 4140..4169 , 4170..4199 , 4200..4229 , 4230..4259 , 4260..4289 , 4290..4319 , 4320..4349 , 4350..4379 , 4380..4409 , 4410..4439 , 4440..4469 , 4470..4499 , 4500..4529 , 4530..4559 , 4560..4589 , 4590..4619 , 4620..4649 , 4650..4679 , 4680..4709 , 4710..4739 , 4740..4769 , 4770..4799 , 4800..4829 , 4830..4859 , 4860..4889 , 4890..4919 , 4920..4949 , 4950..4979 , 4980..5009 , 5010..5039 , 5040..5069 , 5070..5099 , 5100..5129 , 5130..5159 , 5160..5189 , 5190..5219 , 5220..5249 , 5250..5279 , 5280..5309 , 5310..5339 , 5340..5369 , 5370..5399, >>Next

 test/488495: Prove or disprove the product of a rational and an irrational is irrational1 solutions Answer 333446 by richard1234(5390)   on 2011-08-30 21:41:52 (Show Source): You can put this solution on YOUR website!Product of a rational and irrational is always irrational. Assume that on the contrary that a is rational, b is irrational, and their product c is rational. Then The LHS is irrational, while the RHS is a ratio of two rationals (also rational), hence contradiction.
 expressions/488760: Please help me with this Algebra problem. Perform the indicated opperation and, simplify if possible. Thank you. 1/11 + (- 5/6)1 solutions Answer 333441 by richard1234(5390)   on 2011-08-30 21:30:16 (Show Source): You can put this solution on YOUR website!1/11 + (-5/6) = 1/11 - 5/6. Rewrite with LCD, or 66. 1/11 - 5/6 = 6/66 - 55/66 = -49/66
 expressions/488703: Evaluate n-5 where n=81 solutions Answer 333440 by richard1234(5390)   on 2011-08-30 21:27:11 (Show Source): You can put this solution on YOUR website!n-5 = 8-5 = 3
 Coordinate-system/488736: How do i answer the question asking me : What's the point 2 units to the left of point L? I Have Tried & Asked My Mom For Help1 solutions Answer 333437 by richard1234(5390)   on 2011-08-30 21:21:55 (Show Source): You can put this solution on YOUR website!L-2
 absolute-value/488693: Respected Sir , Please help me to simplify this question. For the observations 5,3,6,3,5,10,7,2, there are ____ modes. Thank you 1 solutions Answer 333431 by richard1234(5390)   on 2011-08-30 20:36:59 (Show Source): You can put this solution on YOUR website!3 and 5 occur the most often, and occur the same # of times. There are two modes.
 test/488289: Prove the sum of two rational numbers is rational, using real analysis1 solutions Answer 333389 by richard1234(5390)   on 2011-08-30 17:13:30 (Show Source): You can put this solution on YOUR website!Real analysis would assert that the rational numbers form an ordered field, and that the axiom of closure is satisfied (e.g. the sum of two rational numbers is another rational number in the set). It is also very easy to prove this without any sort of analysis. Just let a/b and c/d be your two rational numbers, and , also a rational number.
 Polynomials-and-rational-expressions/488476: Essay: Show all work. A school designer wants to create a whiteboard with the optimal dimensions to enhance learning. It is determined that if one side of the whiteboard is x + 5y inches, the other side should be x^2+3xy-4y^2 inches. Write an algebraic expression for the area of such a whiteboard, simplify it, and include correct units with your solution. 1 solutions Answer 333388 by richard1234(5390)   on 2011-08-30 17:07:44 (Show Source): You can put this solution on YOUR website! (in^2)
 Distributive-associative-commutative-properties/488400: if 4+3=7 then 7=4+3 what is this property1 solutions Answer 333387 by richard1234(5390)   on 2011-08-30 17:04:18 (Show Source): You can put this solution on YOUR website!symmetric property
 Numbers_Word_Problems/488458: help me find the 2 digit numbers , my number is a 10 digit number greater than 8 and zero is not a number. what is it?1 solutions Answer 333386 by richard1234(5390)   on 2011-08-30 17:01:21 (Show Source): You can put this solution on YOUR website!I thought all ten-digit numbers are greater than 8. And zero is a number. Repost your question so that it makes sense.
 Probability-and-statistics/488401: can someone please help me? essay show all work. a simple dartboard has three areas, the main board has a radious of 9in, there is a circle with a radious of 6 in, and the bullseye has a radious of 2 in, what is the probability of a random dart landing inside the bullseye? round to the nearest thousandth.1 solutions Answer 333385 by richard1234(5390)   on 2011-08-30 16:57:06 (Show Source): You can put this solution on YOUR website!Assuming the probability of landing somewhere is equal, the probability is simply
 Travel_Word_Problems/488233: Your average speed is 18mph, your distance traveled is 1.1 miles. What is your top speed expressed in mph?1 solutions Answer 333327 by richard1234(5390)   on 2011-08-30 09:41:03 (Show Source): You can put this solution on YOUR website!You cannot find your maximum instantaneous speed given that. All you have is your average speed, 18 mph.
 Triangles/488251: How do you know if three numbers make a right triangle?1 solutions Answer 333326 by richard1234(5390)   on 2011-08-30 09:39:32 (Show Source): You can put this solution on YOUR website!If and only if the sum of the squares of the lower two numbers equals the square of the larger number.
 Divisibility_and_Prime_Numbers/487626: if x is a prime number greater than 5,then what is the remainder when X is divided by 6?1 solutions Answer 333298 by richard1234(5390)   on 2011-08-30 01:20:57 (Show Source): You can put this solution on YOUR website!Either 1 or 5. Try primes such as 7 and 11.
 Geometric_formulas/487724: If you made a model of the Earth that was 10cm in radius, how high would Mt. everest rise above sea level?1 solutions Answer 333297 by richard1234(5390)   on 2011-08-30 01:18:47 (Show Source): You can put this solution on YOUR website!Set up a proportion. First, convert km to cm (this should be easy), then solve the proportion for h. Your units should be feet, in which you can convert to some other unit.
 test/487739: In substitution is your final answer a point?1 solutions Answer 333296 by richard1234(5390)   on 2011-08-30 01:16:07 (Show Source): You can put this solution on YOUR website!I have to make the intuitive guess that you are referring to solving a system of linear equations by substitution. If this is so, the answer is yes (most of the time), because a system of two linear equations of two variables will usually have one ordered pair as a solution. Graphically, all this is saying that two lines on the same plane meet at a point. The exceptions are when the lines are parallel (no solutions), or the lines are the same (infinitely many solutions).
 Sequences-and-series/487743: Respected Sir , Please help me to solve this question, I will be very grateful for your help If the AM and HM for two numbers are 5 and 3.2 respectively then the GM will be As the answer given is : 4.00 Please help me to simplify this !!! 1 solutions Answer 333295 by richard1234(5390)   on 2011-08-30 01:13:59 (Show Source): You can put this solution on YOUR website!Let a and b be two numbers with , and The second equation becomes , replace a+b with 10 to get The geometric mean of a and b is , or .
 Problems-with-consecutive-odd-even-integers/487901: true or false if false make a counter-example if the opposite of a number is positive,then one-half of the number is positive 1 solutions Answer 333294 by richard1234(5390)   on 2011-08-30 01:10:05 (Show Source): You can put this solution on YOUR website!False, and always false. For example, the opposite of -8 is 8 (positive) but one-half of -8 is -4 (not positive).
 Equations/487673: Please help me solve this equation 1 solutions Answer 333293 by richard1234(5390)   on 2011-08-30 01:09:10 (Show Source): You can put this solution on YOUR website!That is not an equation; there is no = sign. It is only an expression. You can distribute the negative to get -m - 2n, but that's about it.
 Angles/488022: An angle is three more than twice its compliment. what is the angle?1 solutions Answer 333292 by richard1234(5390)   on 2011-08-30 01:07:59 (Show Source): You can put this solution on YOUR website!Let the angle be x. Then, x = 3 + 2(90-x) (converting into an equation) x = 3 + 180 - 2x 3x = 183 --> x = 61 (degrees) Also, it's spelled "complement." "Compliment" means to praise someone.
 Probability-and-statistics/487927: 3. A technique used to arrive at the regression equation by minimizing the sum of the squares of the vertical differences between the actual Y values and the predicted Y values is known as the ______________.1 solutions Answer 333291 by richard1234(5390)   on 2011-08-30 01:05:31 (Show Source): You can put this solution on YOUR website!Usually called "least squares regression" or "least squares."
 Complex_Numbers/488110: (-4+6i)(-3+7i)1 solutions Answer 333290 by richard1234(5390)   on 2011-08-30 01:01:15 (Show Source): You can put this solution on YOUR website!The other tutor is referring to it as FOIL (instead of foil) because FOIL is an acronym for "first, outer, inner, last," an order in which you can multiply two binomials. For example, (-4+6i)(-3+7i) = (-4)(-3) + (-4)(7i) + (6i)(-3) + (6i)(7i) = 12 - 28i - 18i - 42 = -30 - 46i The textbook writers must have come up with FOIL pretty recently. I don't remember learning that acronym in my algebra class...and I'm a senior in HS so it's only been 5 or so years since I learned algebra.
 Travel_Word_Problems/487956: suppose you take a trip that covers 320km and takes 2 hours 1 solutions Answer 333289 by richard1234(5390)   on 2011-08-30 00:58:01 (Show Source): You can put this solution on YOUR website!I have supposed that information. What next?