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 'richwmiller'

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 , 5400..5429 , 5430..5459 , 5460..5489 , 5490..5519 , 5520..5549 , 5550..5579 , 5580..5609 , 5610..5639 , 5640..5669 , 5670..5699 , 5700..5729 , 5730..5759 , 5760..5789 , 5790..5819 , 5820..5849 , 5850..5879 , 5880..5909 , 5910..5939 , 5940..5969 , 5970..5999 , 6000..6029 , 6030..6059 , 6060..6089 , 6090..6119 , 6120..6149 , 6150..6179 , 6180..6209 , 6210..6239 , 6240..6269 , 6270..6299 , 6300..6329 , 6330..6359 , 6360..6389 , 6390..6419 , 6420..6449 , 6450..6479 , 6480..6509 , 6510..6539 , 6540..6569 , 6570..6599 , 6600..6629 , 6630..6659 , 6660..6689 , 6690..6719 , 6720..6749 , 6750..6779 , 6780..6809 , 6810..6839 , 6840..6869 , 6870..6899 , 6900..6929 , 6930..6959 , 6960..6989 , 6990..7019 , 7020..7049 , 7050..7079 , 7080..7109 , 7110..7139 , 7140..7169 , 7170..7199 , 7200..7229 , 7230..7259 , 7260..7289 , 7290..7319 , 7320..7349 , 7350..7379 , 7380..7409 , 7410..7439 , 7440..7469 , 7470..7499 , 7500..7529 , 7530..7559 , 7560..7589 , 7590..7619 , 7620..7649 , 7650..7679 , 7680..7709 , 7710..7739 , 7740..7769 , 7770..7799 , 7800..7829 , 7830..7859 , 7860..7889 , 7890..7919 , 7920..7949 , 7950..7979 , 7980..8009 , 8010..8039 , 8040..8069 , 8070..8099 , 8100..8129 , 8130..8159 , 8160..8189 , 8190..8219 , 8220..8249 , 8250..8279 , 8280..8309 , 8310..8339 , 8340..8369 , 8370..8399 , 8400..8429 , 8430..8459 , 8460..8489 , 8490..8519 , 8520..8549 , 8550..8579 , 8580..8609 , 8610..8639 , 8640..8669 , 8670..8699 , 8700..8729 , 8730..8759 , 8760..8789 , 8790..8819 , 8820..8849 , 8850..8879 , 8880..8909 , 8910..8939 , 8940..8969 , 8970..8999 , 9000..9029 , 9030..9059 , 9060..9089 , 9090..9119 , 9120..9149, >>Next

 Problems-with-consecutive-odd-even-integers/296231: my first digit is odd. my second digit is even and less than my first digit. the product of my two digits is 18, what am i ?1 solutions Answer 213501 by richwmiller(9143)   on 2010-04-25 10:09:11 (Show Source): You can put this solution on YOUR website!Factors of 18 1*18 2*9 3*6 odd a > even b The number must be 92.
 Quadratic_Equations/296223: Find the quadratic equation If r1+r2 = 0 , r1*r2 = 61 solutions Answer 213500 by richwmiller(9143)   on 2010-04-25 10:02:19 (Show Source): You can put this solution on YOUR website!for clarity let r1=r and s=r2 r+s=0 r*s=6 (r-i*sqrt(6))*(r+i*sqrt(6))*(s-i*sqrt(6))*(s+i*sqrt(6))=0 (r^2+6)*(s^2+6)=0 r^2s^2+6r^2+6s^2+36=0
 Quadratic_Equations/296229: Express the quadratic function in standard form, find its vertex and its x- and y- intercepts and sketch its graph. 1 solutions Answer 213499 by richwmiller(9143)   on 2010-04-25 09:51:43 (Show Source): You can put this solution on YOUR website!A similar problem was submitted a few minutes earlier.
 Quadratic_Equations/296230: Express the quadratic function in standard form,1 solutions Answer 213498 by richwmiller(9143)   on 2010-04-25 09:44:13 (Show Source): You can put this solution on YOUR website!Same problem submitted 14 seconds earlier
 Percentage-and-ratio-word-problems/296214: A basket contains some apples. Alice takes 1/2 of the apples and then places 15 of the apples back in the basket. Barry then takes 1/2 of the remaining apples and places 10 back in the basket.They find that each of them has the same number of apples. How many apples are left in the basket? (A) 10 (B) 20 (C) 30 (D) 50 (E) Not enough information1 solutions Answer 213497 by richwmiller(9143)   on 2010-04-25 09:23:21 (Show Source): You can put this solution on YOUR website!(x/2-15)=(x/2+15)/2-10 b =(x/2+15)/2-10 a=x/2-15 k=x-a-b We only need the first equation to solve for x the number of apples in the beginning b= barry's apples at end a= alice's apples at end k equals number of apples left in basket at end x= 50 apples in the beginning a takes 25 and puts 15 back a=10 basket has 40 now b takes 20 and returns 10 b=10 basket has 30 now Barry and Alice each have 10 30 left in the basket
 Equations/296139: A lumber yard can convert logs into either lumber or plywood. In a given day, the mill turns out twice as many units of plywood as lumber. It makes a profit of \$20 on a unit of lumber and \$45 on a unit of plywood. How many of each unit must be produced and sold in order to make a profit of \$11440?1 solutions Answer 213454 by richwmiller(9143)   on 2010-04-24 22:11:46 (Show Source): You can put this solution on YOUR website!Same problem different numbers http://www.algebra.com/algebra/homework/Linear-equations/Linear-equations.faq.question.182987.html
 Polynomials-and-rational-expressions/296074: Trying to factor: x^2-xy-x+y1 solutions Answer 213450 by richwmiller(9143)   on 2010-04-24 21:54:22 (Show Source): You can put this solution on YOUR website!No need to rearrange. x*(x-y)-1*(x-y) (x-1)*(x-y)
 Functions/296105: I was given this problem to solve: f(x) = 12/7 Evaluate for f(6). I cannot see how this is a function, since there is only one variable on the left side of the equation. The answer I submitted was that there was no real solution and I was graded as wrong. Can you tell me how to solve this problem? 1 solutions Answer 213447 by richwmiller(9143)   on 2010-04-24 21:44:08 (Show Source): You can put this solution on YOUR website!No matter what x is f(x)=12/7 So f(6) is still 12/7 It is a function. y can have many x's (think zeroes or roots) but x can have only one y. So x=12/7 is not a function.
 Mixture_Word_Problems/296083: how much of an 80% nitric acid solution must be added to a 125gram solution of 10% nitric acid to produce a 50% nitric acid solution?1 solutions Answer 213442 by richwmiller(9143)   on 2010-04-24 21:31:27 (Show Source): You can put this solution on YOUR website!.8x+125*.1=(125+x)*.5 166 2/3=x
 Linear-equations/296120: Decide whether the pair of lines is paralle, perpendicular, or neither. 4x+3y=10 4x+3y=51 solutions Answer 213439 by richwmiller(9143)   on 2010-04-24 21:19:52 (Show Source): You can put this solution on YOUR website!both have slope -4/3 parallel
 Expressions-with-variables/296007: A semicircular window of a radius 14 inches is o be laminated with a sunblock coating that costs \$.70 per square inch to apply. What is the total cost of coating the window to the nearest cent? Please show your work. Thanks.1 solutions Answer 213395 by richwmiller(9143)   on 2010-04-24 18:23:06 (Show Source): You can put this solution on YOUR website!area=pi*r^2 We want half of that. then multiply by.70
 Probability-and-statistics/296065: Completely Lost with an exercise in my statistics textbook. 1 solutions Answer 213393 by richwmiller(9143)   on 2010-04-24 18:19:07 (Show Source): You can put this solution on YOUR website!Submitted 4 times in less than a minute.
 Probability-and-statistics/296064: Completely Lost with an exercise in my statistics textbook.1 solutions Answer 213392 by richwmiller(9143)   on 2010-04-24 18:18:08 (Show Source): You can put this solution on YOUR website!Submitted 4 times in less than a minute.
 Probability-and-statistics/296063: Completely Lost with an exercise in my statistics textbook. 1 solutions Answer 213391 by richwmiller(9143)   on 2010-04-24 18:17:08 (Show Source): You can put this solution on YOUR website!Submitted 4 times in less than a minute.
 Probability-and-statistics/296062: Completely Lost with an exercise in my statistics textbook. 1 solutions Answer 213390 by richwmiller(9143)   on 2010-04-24 18:16:04 (Show Source): You can put this solution on YOUR website!Submitted 4 times in less than a minute.
 logarithm/296058: Could you please help me set this problem up. I have searched my algebra book and found nothing and this isn't something we went over in class. Given information; Richter scale converts seismographic readings into numbers...according to this function: M(x)= log(x/x*) , Where x*=10^-3 Question; What is the magnitude of an earthquake whose seismographic reading is 6.5 mm at a distance of 100 kilometers from its epicenter? Round answer to nearest tenth. I have no idea how to set the above problem up. Where and what do I plug in to even try and answer it? Could you also check my work on another problems? Q: Write as a sum and/or differnece of a logarithms. Express powers as factors. A: I wasn't sure if I'm supposed to brake up the and with a plus sign like: (The 13 doesn't sit on the sqrt it sits outside of it.) If you could shed some light on these problems I would greatly appreciate it. Thank you in advance. 1 solutions Answer 213389 by richwmiller(9143)   on 2010-04-24 18:13:41 (Show Source): You can put this solution on YOUR website!check this http://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.269839.html
 Quadratic_Equations/296022: I need help with finding any x-intercepts and the y-intercepts. If no x-intercepts exist, state this. g(x)=2x^2+3x-1 This is what I have so far let y=2x^2+3x-1 for y-intercept, let x=0 for x-intercept lrt y=0 2x^2+3x-1=0 x=(-3+sqrt17)/41 solutions Answer 213387 by richwmiller(9143)   on 2010-04-24 18:01:41 (Show Source): You can put this solution on YOUR website!square roots always come in plus and minus pairs. don't forget x=(-3-sqrt17)/4 and what happened to for y-intercept, let x=0 y=2x^2+3x-1 let x=0
 Human-and-algebraic-language/296014: i need to find the answer of these equations by either substitution or elimination: 0.2x+0.4y=1.7 and 8.3x-6.3y=-4.31 solutions Answer 213381 by richwmiller(9143)   on 2010-04-24 17:41:53 (Show Source): You can put this solution on YOUR website!Two solutions for the price of one . http://www.algebra.com/algebra/homework/coordinate/Linear_Equations_And_Systems_Word_Problems.faq.question.230903.html
 Radicals/296057: Honestly I do not know where to begin with this question I am really stuck, Since 1988 basic yacht dimensions for the America’s cup competition have satisfied the inequality L+1.25√S-9.8^3√D≤16.296 NOTE- after the 9.8 the cubed is above the square root not the 8 Where L is the boat’s length in meters (m), S is the sail area in square meters, and D is the displacement in cubic meters. A team of naval architects is planning to build a boat with a displacement of 21.44 cubic meters (m^3), a sail area of 320.13 square meters (m^2) and a length of 21.22 m. Does this boat satisfy the inequality? If the length and displacement of this boat cannot be changed, then how many square meters of sail area must be removed so that the boat satisfies the inequality?1 solutions Answer 213379 by richwmiller(9143)   on 2010-04-24 17:35:42 (Show Source): You can put this solution on YOUR website!Do you mean ? That is not cubed but the opposite cube root.
 expressions/296055: (-1/5)^{3} - how do I figure this one out?1 solutions Answer 213377 by richwmiller(9143)   on 2010-04-24 17:32:10 (Show Source): You can put this solution on YOUR website!multiply (-1/5)*(-1/5)*(-1/5) Will the final product be minus or plus?
 Inequalities/296029: i need to know how to solve the equation two-thirds = 2 - 5x-3 over x-11 solutions Answer 213376 by richwmiller(9143)   on 2010-04-24 17:29:07 (Show Source): You can put this solution on YOUR website!2/3=2-5x-3/(x-1) But what is over x-1? 2-5x-3? x=-1/17 5x-3? x=5/11 -3? x = 1/30 (19+i sqrt(419)) and x = 1/30 (19-i sqrt(419))
 Surface-area/296045: From a 17-inch-by-12-inch piece of cardboard, 2.5-inch-square corners are cut out, as shown in the figure above, and the resulting flaps are folded up to form an open box. What is the volume of the box? What is the surface area of the box?1 solutions Answer 213375 by richwmiller(9143)   on 2010-04-24 17:20:06 (Show Source): You can put this solution on YOUR website!Where is the figure above or the description?
 expressions/296047: 19/22 + (-1/2) Im confused on how to get to the solution1 solutions Answer 213374 by richwmiller(9143)   on 2010-04-24 17:18:22 (Show Source): You can put this solution on YOUR website!Two things to do: First plus a minus is minus 19/22-1/2 Now convert 1/2 to x/22 1/2=11/22 19/22-11/22 8/22 4/11 All done. BTW 4/11 is not a solution. It is a simplification. Equations have solutions. This is not an equation. Nothing is equal to anything in the original 19/22+(-1/2)
 Polynomials-and-rational-expressions/296051: please solve: t^2+8t-201 solutions Answer 213373 by richwmiller(9143)   on 2010-04-24 17:13:32 (Show Source): You can put this solution on YOUR website!what are factors of -20 that add up to +8 10 and -2 (t+10)*(t-2)