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 'rfer'

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 , 9150..9179 , 9180..9209 , 9210..9239 , 9240..9269 , 9270..9299 , 9300..9329 , 9330..9359 , 9360..9389 , 9390..9419 , 9420..9449 , 9450..9479 , 9480..9509 , 9510..9539 , 9540..9569 , 9570..9599 , 9600..9629 , 9630..9659 , 9660..9689 , 9690..9719 , 9720..9749 , 9750..9779 , 9780..9809 , 9810..9839 , 9840..9869 , 9870..9899 , 9900..9929 , 9930..9959 , 9960..9989 , 9990..10019 , 10020..10049 , 10050..10079 , 10080..10109 , 10110..10139 , 10140..10169 , 10170..10199 , 10200..10229 , 10230..10259 , 10260..10289 , 10290..10319 , 10320..10349 , 10350..10379 , 10380..10409 , 10410..10439 , 10440..10469 , 10470..10499 , 10500..10529 , 10530..10559 , 10560..10589 , 10590..10619 , 10620..10649 , 10650..10679 , 10680..10709 , 10710..10739 , 10740..10769 , 10770..10799 , 10800..10829 , 10830..10859 , 10860..10889 , 10890..10919 , 10920..10949 , 10950..10979 , 10980..11009 , 11010..11039 , 11040..11069 , 11070..11099 , 11100..11129 , 11130..11159 , 11160..11189 , 11190..11219 , 11220..11249 , 11250..11279 , 11280..11309 , 11310..11339 , 11340..11369 , 11370..11399 , 11400..11429 , 11430..11459 , 11460..11489 , 11490..11519 , 11520..11549 , 11550..11579 , 11580..11609 , 11610..11639 , 11640..11669 , 11670..11699 , 11700..11729 , 11730..11759 , 11760..11789 , 11790..11819 , 11820..11849 , 11850..11879 , 11880..11909 , 11910..11939 , 11940..11969 , 11970..11999 , 12000..12029 , 12030..12059 , 12060..12089 , 12090..12119 , 12120..12149 , 12150..12179 , 12180..12209 , 12210..12239 , 12240..12269 , 12270..12299 , 12300..12329 , 12330..12359 , 12360..12389 , 12390..12419 , 12420..12449 , 12450..12479 , 12480..12509 , 12510..12539 , 12540..12569 , 12570..12599 , 12600..12629 , 12630..12659 , 12660..12689, >>Next

 Polynomials-and-rational-expressions/233301: P dollars is invested at annual interest rate r for 1 year. If the interest is compounded semiannually, then the polynomial P(1+r/2)^2 represents the value of the investment after one year. Rewrite this expression without parentheses. Evaluate the polynomial if P=\$200 and r= 10%.1 solutions Answer 172213 by rfer(12670)   on 2009-10-30 18:08:48 (Show Source): You can put this solution on YOUR website!A=200*1.05^2 A=200*1.1025 A=\$220.50
 expressions/233318: -2x+4=5-3x1 solutions Answer 172212 by rfer(12670)   on 2009-10-30 18:03:56 (Show Source): You can put this solution on YOUR website!-2x+4=5-3x x=1
 Equations/233312: 40-0.2Q=0.2Q1 solutions Answer 172206 by rfer(12670)   on 2009-10-30 17:04:46 (Show Source): You can put this solution on YOUR website!40-0.2q=0.2q 40=0.4q q=100
 Inverses/233247: Solve for t w=a^2/t1 solutions Answer 172174 by rfer(12670)   on 2009-10-30 12:34:37 (Show Source): You can put this solution on YOUR website!t=a^2/w t times w equals a^2 so divide either into a^2
 Linear-equations/232533: point slope form of the line that passes through (4,-1) with the slope of two1 solutions Answer 172172 by rfer(12670)   on 2009-10-30 12:21:35 (Show Source): You can put this solution on YOUR website!y-y1=m(x-x1) y-(-1)=2(x-4) y+1=2x-8 y=2x-9
 Triangles/233201: if a particular right triangle has two equial side, this would be >>> - a 30-60-90 right triangle, b 45 degree right triangel, c 40-50 right triangle, or d 20-70 right triangle. thanks1 solutions Answer 172161 by rfer(12670)   on 2009-10-30 11:50:36 (Show Source): You can put this solution on YOUR website!b) an equilateral triangle
 Angles/233236: The Measure Of A Angle Is 18 Less Than Twice Its Complement. Find The Measure Of The Angle.1 solutions Answer 172159 by rfer(12670)   on 2009-10-30 11:46:57 (Show Source): You can put this solution on YOUR website!x+2x-18=90 3x=108 x=36 2x-18=54
 Equations/233073: the perimeter of a pool table is 30ft. the table is twice as long as it is wide.what is the length of the pool table.1 solutions Answer 172110 by rfer(12670)   on 2009-10-29 23:06:37 (Show Source): You can put this solution on YOUR website!P=2w+2L 30=2w+2(2w) 30=6 w=5ft L=10ft
 Equations/233075: victoria weight 5/7 as much as mario. victoria weights 125bl.how much does mario weight?1 solutions Answer 172109 by rfer(12670)   on 2009-10-29 23:03:06 (Show Source): You can put this solution on YOUR website!5/7=125/x cross multiply 5x=875 x=175 lbs mario
 percentage/233077: what percent of 88.6 is 70?1 solutions Answer 172108 by rfer(12670)   on 2009-10-29 22:58:46 (Show Source): You can put this solution on YOUR website!70/88.6=.79=79%
 Polynomials-and-rational-expressions/233088: Solve. -(x+8)=3(2x-4)1 solutions Answer 172107 by rfer(12670)   on 2009-10-29 22:52:35 (Show Source): You can put this solution on YOUR website!-(x-8)=3(2x-4) -x+8=6x-12 -7x=-20 x=20/7=2 6/7
 Linear-equations/233026: what is the slope and y intercept of this equation 5x-2y=10 y=-5?? slope= -5/-2 ????1 solutions Answer 172071 by rfer(12670)   on 2009-10-29 19:40:00 (Show Source): You can put this solution on YOUR website!5x-2y=10 -2y=-5x+10 y=5/2x-10 y=mx+b m=slope=5/2 b=-10 (0,-10) remember when multiplying or dividing by to negative numbers the results is positive.
 Inequalities/232967: 5x+24=2x+151 solutions Answer 172054 by rfer(12670)   on 2009-10-29 18:29:52 (Show Source): You can put this solution on YOUR website!5x+24=2x+15 3x=-9 x=-3
 Functions/232981: A photographer charges a sitting fee of\$15 plus \$3 for each pose. Write a function to describe the situation.1 solutions Answer 172053 by rfer(12670)   on 2009-10-29 18:27:13 (Show Source): You can put this solution on YOUR website!15+3x=
 Signed-numbers/232911: can you help me solve this -14 -231 solutions Answer 172048 by rfer(12670)   on 2009-10-29 17:55:04 (Show Source): You can put this solution on YOUR website!-14-23=-37
 Proportions/232920: find the value of x. 6x-2 over 7 = 5x+7 over 81 solutions Answer 172046 by rfer(12670)   on 2009-10-29 17:53:14 (Show Source): You can put this solution on YOUR website!6x-2/7=5x+7/8 8*(6x-2)=7*(5x+7) 48x-16=35x+49 13x=65 x=5
 Miscellaneous_Word_Problems/232916: For every 1 hour parked or part of, there is a 1.00 charge for parking or any part of an hour. There is a \$5.00 daily Maximum 1. Customer arrives at 9:15 am Total time parked hrs mins Customer departs at 11:30 am Total parking charge 1 solutions Answer 172044 by rfer(12670)   on 2009-10-29 17:45:53 (Show Source): You can put this solution on YOUR website!2.25 hrs * \$1 per hr=\$2.25
 Polynomials-and-rational-expressions/232917: 12(2x+1)=9(2x-5)+271 solutions Answer 172043 by rfer(12670)   on 2009-10-29 17:42:48 (Show Source): You can put this solution on YOUR website!12(2x+1)=9(2x-5)+27 24x+12=18x-45+27 combine like terms 6x=30 x=5
 Linear-equations/232949: can you help me figure out this linear equation and help me graph it. y=-2/3x+51 solutions Answer 172040 by rfer(12670)   on 2009-10-29 17:38:18 (Show Source): You can put this solution on YOUR website!y=-2/3x+5 y=-2/3(0)+5 y=5 (0,5) -------------- 2/3x=-y+5 2/3x=-0+5 2/3x=5x=5*3/2 x=15/2 x=7 1/2 (7 1/2,0) There is a start for you
 Inequalities/232950: three new ink cartridges cast \$9 less than 5 new ink cartridges. Write and solve an equation to find the cost of each ink cartidges. 1 solutions Answer 172036 by rfer(12670)   on 2009-10-29 17:33:32 (Show Source): You can put this solution on YOUR website!3x-9=5x 2x=9 x=\$4.50 ea
 Vectors/232927: solve by substitution 4x+5y= -9 -2x+y=15 what is the solution set , I came up with (-2,4) am I right1 solutions Answer 172017 by rfer(12670)   on 2009-10-29 16:38:23 (Show Source): You can put this solution on YOUR website!Give it another try. The answer is (-6,3)
 Mixture_Word_Problems/232862: a motel charges 80.00 per day for double occupancy and 70.00 per day for single occupancy. If 80 rooms are occupied one night for a total of 5800.00 how many rooms of each kind are occupied?1 solutions Answer 171993 by rfer(12670)   on 2009-10-29 14:29:20 (Show Source): You can put this solution on YOUR website!d+s=80, d=80-s 80d+70s=5800 80(80-s)+70s=5800 6400-80s+70s=5800 -10s=-600 s=60 d=20
 Exponents/232872: 1.Solve using the five-step problem-solving process. Show all steps necessary to arrive at your solution. Express the answer in scientific notation to two decimals places unless requested otherwise. If the distance from the earth to the sun were 92,900,000 miles, how long would it take a rocket, traveling at 2.8 × 103 miles per hour, to reach the sun? (Round to three places) 2.A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs \$0.85 per square inch to apply. What is the total cost of coating the window, to the nearest cent? (Use п = 3.14. Hint: Area of Circle: A = пr2) 3.A square light-switch plate is made which measures 6 inches on each side. A square hole measuring 1 inch on each side is left in the center. If the cost to construct the plate is \$3.50 per square inch, what is the construction cost? (Hint: Use A = s2) 4.A cylindrical drum has a diameter of 3 feet and a volume of 45 cubic feet. What is the height of the drum? (Hint: Use V = пr2h) 1 solutions Answer 171990 by rfer(12670)   on 2009-10-29 14:20:26 (Show Source): You can put this solution on YOUR website!2) A=(pir^2)/2 A=3.14*10^2/2 A=157 sq in 3) A=s^2-1^2 A=6^2-1^2 A=36-1 A=35 35*3.5=\$122.50 4) V=pir^2h h=V/pir^2 h=45/3.14*1.5^2 h=45/7.065 h=6.37 ft
 Linear-equations/232887: through:(3,5), slope=5/3 1 solutions Answer 171986 by rfer(12670)   on 2009-10-29 14:08:59 (Show Source): You can put this solution on YOUR website!y=mx+b y=5/3x b=0 (0,0)
 Travel_Word_Problems/232869: an airplane and a jet aircraft cross each other at different altitudes traveling in opposite directions the jet travels 5 times the rate of the airplane. In 3 hours they are 1620 miles apart. find the speed of each aircraft.1 solutions Answer 171984 by rfer(12670)   on 2009-10-29 14:07:05 (Show Source): You can put this solution on YOUR website!3(5x+x)=1620 15x+3x=1620 18x=1620 x=90 mph 5x=450 mph
 Triangles/232771: A right triangle has a hypotenuse c=12.6 and a leg b=8.5. What does leg a approximately equal? 1 solutions Answer 171935 by rfer(12670)   on 2009-10-29 02:06:08 (Show Source): You can put this solution on YOUR website!c^2=a^2+b^2 12.6^2-8.5^2=a^2 158.76-72.25=86.51 sq rt of 86.51=9.3
 decimal-numbers/232768: How do I solve this equation: x - 0.25x = 721 solutions Answer 171934 by rfer(12670)   on 2009-10-29 02:02:43 (Show Source): You can put this solution on YOUR website!x-0.25x=72 0.75x=72 x=96
 Polynomials-and-rational-expressions/232686: 3d-8=-6+d wats the answer 1 solutions Answer 171925 by rfer(12670)   on 2009-10-28 23:39:53 (Show Source): You can put this solution on YOUR website!3d-8=-6+d 2d=2 d=1
 Equations/232698: A copy center offers its customers two different pricing plans for black and white photocopies of 8.5 in. by 11 in. pages. Customers can either pay 8 cents per page or 7.50 for a discount card the lowers the cost to 5 cents per page. Write and solve an equation to find the number of photocopies for which the cost of each plan is the same.1 solutions Answer 171924 by rfer(12670)   on 2009-10-28 23:37:17 (Show Source): You can put this solution on YOUR website!.08x=7.5+.05x .03x=7.5 x=250 copies
 decimal-numbers/232700: Algebra: What is decimal form of 7/12?1 solutions Answer 171923 by rfer(12670)   on 2009-10-28 23:34:25 (Show Source): You can put this solution on YOUR website!7/12=0.58333333 divide 7 by 12
 Circles/232710: a ball has radius of 10 inches. find the surface area. leave the answer in terms of pie.1 solutions Answer 171921 by rfer(12670)   on 2009-10-28 23:32:49 (Show Source): You can put this solution on YOUR website!A=4pir^2 A=4(3.14)(10)^2