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 'ewatrrr'

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, >>Next

 Polynomials-and-rational-expressions/400104: -3/2x+5=2/x-1 the 2x+5 goes under the -3 and the x-1 goes under the 2--(I just wanted to be very clear of what the problem looked like so that I could be sure I communicated how it looked on my math book page correctly. this problem according to the book equals -1 but I got -13/7 and when tried another way I got -7 Here is what I did for -3/2x+5=2/x-1: for the -13/7 -3x+3=4x+10 and subtracted a -4x from both sides so -7x+3=10 and subtracted three from both sides so -7x/-7 = - 13/7 (negative 13 over 7) Here is what I did for the -7 -3x+3=4x+10 and subtracted 3x from both sides so 3=x+10 and then a -10 subtracted from the three gave me -7=x I checked to be sure I copied the problem correctly, double checked. 1 solutions Answer 283307 by ewatrrr(10682)   on 2011-01-26 14:18:03 (Show Source): You can put this solution on YOUR website! ``` Hi -3x + 3 = 4x + 10 |Yes! cross multiplying -7x = 7 |subtracting 4x and 3 from both sides x = -1 ```
 logarithm/400077: express x in terms of log 10 : 4^x-2 = 7^3x+1 I don't understand how I am suppose to set up this problem or how to do it. :( any help (stepbystep etc.) would be really really appreciated thanks!1 solutions Answer 283305 by ewatrrr(10682)   on 2011-01-26 14:12:45 (Show Source): You can put this solution on YOUR website! ``` Hi Let log indicate a base of ten 4^x-2 = 7^3x+1 (x-2)log4 = (3x + 1)log7 xlog4 - 2log4 = 3xlog7 + log7 -2log4 -log7 = x(3log7 - log4) ```
 Polynomials-and-rational-expressions/400079: A rectangle has an area given by A = x^2 + 5x + 6 Find an expression for the possible length of the rectangle. please i need help asap!! thankyou1 solutions Answer 283304 by ewatrrr(10682)   on 2011-01-26 14:05:32 (Show Source): You can put this solution on YOUR website! ``` Hi A = L*W for a rectangle A = x^2 + 5x + 6 factoring A = (x+3)(x+2) Either (x+3) or (x+2) would be an expression for the possible length of this rectangle ```
 Expressions-with-variables/400089: x-7/12=5/61 solutions Answer 283301 by ewatrrr(10682)   on 2011-01-26 14:01:52 (Show Source): You can put this solution on YOUR website! ``` Hi Solving for x x -7/12 = 5/6 x = 5/6 + 7/12 x = 10/12 + 7/12 x = 17/12 or 1 5/12 ```
 Inequalities/400086: 11x>221 solutions Answer 283300 by ewatrrr(10682)   on 2011-01-26 13:59:38 (Show Source): You can put this solution on YOUR website! ``` Hi 11x > 22 |dividing both sides of the inequality by 11 x > 2 ```
 Probability-and-statistics/400083: "there are 8 green,10 red and 12 yellow balls in a basket.If we pick a ball at random what is the probability that ball is not green and red"1 solutions Answer 283299 by ewatrrr(10682)   on 2011-01-26 13:58:12 (Show Source): You can put this solution on YOUR website! ``` Hi 30 balls in all, 8 of which are green, 10 are red and 12 are yellow P(yellow)= 12/30 = 6/15 ```
 Evaluation_Word_Problems/400100: Hi, I need help on this question that I don't understand. In this question you have to find out what "x" is. 32x + 43 - 20x = -25 + 30 - 45x I've tried a few times and even used the calculator but somehow when I check it over (by putting in the value of x into the spots)the two answers are not equivalent. Thanks!1 solutions Answer 283298 by ewatrrr(10682)   on 2011-01-26 13:54:10 (Show Source): You can put this solution on YOUR website! ``` Hi solving for x 32x + 43 - 20x = -25 + 30 - 45x 12x + 43 = 5 - 45x 57x = -38 x = -38/57 ```
 Polynomials-and-rational-expressions/400098: I can't seem to get the correct answer to this problem: Help would be great!1 solutions Answer 283296 by ewatrrr(10682)   on 2011-01-26 13:51:17 (Show Source): You can put this solution on YOUR website! ``` Hi ```
 Linear-equations/400090: How do you find the y-intercept of a line when it is given in slope-intercept form?1 solutions Answer 283294 by ewatrrr(10682)   on 2011-01-26 13:49:35 (Show Source): You can put this solution on YOUR website! ``` Hi One finds the y-intercept by 'reading' it off the slope intercept form y-intercept is Pt(0,b) ```
 Linear-equations/400091: How do you find the x-intercept of a line when it's given in slope-intercept form?1 solutions Answer 283293 by ewatrrr(10682)   on 2011-01-26 13:47:57 (Show Source): You can put this solution on YOUR website! ``` Hi One finds the x-intercept by exploring when y = 0 0 = mx + b -b/m = x, the x coordinate of the x-intercept ```
 Linear-equations/400088: What is the equation of a horizontal line?1 solutions Answer 283290 by ewatrrr(10682)   on 2011-01-26 13:43:14 (Show Source): You can put this solution on YOUR website! ``` Hi equation of an horizontal line can be expressed as y = k where k in constant ```
 Travel_Word_Problems/400070: A boat travels 12 km upstream and back in 1 hour 45 minutes. If the speed of the current is 3 km/h throughout, find the speed of the boat in still water, giving your answer correct to 3 significant figures.1 solutions Answer 283288 by ewatrrr(10682)   on 2011-01-26 13:41:15 (Show Source): You can put this solution on YOUR website!``` Hi Let s represent the speed of the boat in still water D = r*t OR t = D/r Question states*** (note round trip took 1.75hr) 12/(s+3) + 12/(s-3) = 1.75hr Solving for x 12(s-3) + 12(s+3) = 1.75(s+3)(s-3) 24s = 7/4(s^2-9) 7/4s^2 - 24s - 63/4 = 0 7s^2 - 96s - 63 = 0 |discarding the negative solution s = 14.342 kmph ```
 Rectangles/400072: Suppose that a rectangle has an area of 44 square meters. Express the perimeter P as a function of the length x of one of the sides. 1 solutions Answer 283276 by ewatrrr(10682)   on 2011-01-26 13:17:11 (Show Source): You can put this solution on YOUR website! ``` Hi Let s represent one of the sides of the rectangle Question states*** A = L*W = 44m^2 L*s = 44m^2 L = 44m^2/s P = 2W + 2L P = 2s + 2( 44m^2/s) ```
 Numbers_Word_Problems/400066: the difference of two numbers is 9. twice the first number added to the second number is 24. find the two numbers.1 solutions Answer 283274 by ewatrrr(10682)   on 2011-01-26 13:12:39 (Show Source): You can put this solution on YOUR website! ``` Hi difference of two numbers is 9 Let x and (x+9) represent the first and second number respectively Question states*** 2x + (x+9) = 24 Solving for x 3x = 15 x = 5 Second number is 14 (5+9) CHECKING our Answer*** 10 + 14 = 24 ```
 test/400069: Determine the type and number of solutions for x^2 + 6x +9 = 01 solutions Answer 283272 by ewatrrr(10682)   on 2011-01-26 13:06:21 (Show Source): You can put this solution on YOUR website! ``` Hi x^2 + 6x +9 = 0 factoring (x+3)(x+3)=0 Note:SUM of the inner product(3x) and the outer product(3x) = 6x One solution x = -3 ```
 Functions/400064: Given that f(x) = x^2 + ax + 15 has a minimum value of -12 what is a ? think im missing something very simple in solving this problem. its suppose to involve only algebra in order to solve but i got completely lost and tried using calculus which got me even more lost -- I was thinking minimum value -12 means lower limit of the parabula is -12 so i solved the derivative of the function to be that x =a/2 kept going for a while and got an answer that made no sense. soooo what am i missing how do i do this problem with just algebra?1 solutions Answer 283271 by ewatrrr(10682)   on 2011-01-26 13:04:12 (Show Source): You can put this solution on YOUR website! ``` Hi f(x) = x^2 + ax + 15 with a minimum value of -12 f(x) = (x+ a/2)^2 - a^2/4 + 15 Using the vertex form of a parabola, where(h,k) is the vertex -a^2/4 + 15 = -12 27 = a^2/4 27*4 = a^2 a = ± sqrt(108) ```
 Polynomials-and-rational-expressions/399977: Please help. Find the difference. (-3x^3-9x^2-5)-(-7x^2-6x-2) 1 solutions Answer 283269 by ewatrrr(10682)   on 2011-01-26 12:53:43 (Show Source): You can put this solution on YOUR website! ``` Hi Simplifying by combining like terms (-3x^3-9x^2-5)-(-7x^2-6x-2) 1*(-3x^3-9x^2-5) -1*(-7x^2-6x-2) -3x^3 -9x^2 -5 + 7x^2 + 6x + 2 -3x^3 -2x^2 + 6x - 3 ```
 Numeric_Fractions/400025: 6x+(5x-8)1 solutions Answer 283268 by ewatrrr(10682)   on 2011-01-26 12:49:18 (Show Source): You can put this solution on YOUR website! ``` Hi Simplifying by combining like terms 6x+ (5x-8) 6x+ 1*(5x-8) 6x+ 5x-8 11x - 8 ```
 test/400048: the probability that given alternator will fail on a 1 hour flight is .02? What is the probability 1 solutions Answer 283267 by ewatrrr(10682)   on 2011-01-26 12:46:19 (Show Source): You can put this solution on YOUR website! ``` Hi Please repost with complete question so as our Tutors can best be of an assistance to You. ```
 Linear-equations/400059: A linear function has the same y-intercept as x+4y=12 and its graph contains the point (5,4). Find the y-intercept and slope of the linear function. a) y intercept= (0,3), slope= 5 b) y intercept= (0,12), slope= 1/5 c) y intercept= (0,3), slope= -1/4 d) y intercept= (0,3), slope= 1/51 solutions Answer 283266 by ewatrrr(10682)   on 2011-01-26 12:42:38 (Show Source): You can put this solution on YOUR website! ``` Hi x+4y=12 |solving for y y = (-1/4)x + 3 y-intercept is Pt(0,3) Line with same y-intercept y = mx + 3 |using ordered pair Pt(5,4) to solve for m 4 = m*5 + 3 1/5 = m ```
 Functions/400054: Can you please help, Evaluate the logarithm without a calculator: log9(1/3)1 solutions Answer 283262 by ewatrrr(10682)   on 2011-01-26 12:35:40 (Show Source): You can put this solution on YOUR website! ``` Hi 9^y = 1/3 y = -1/2 ```
 Functions/400055: Can you please help, Evaluate the logarithm without a calculator: log10,0001 solutions Answer 283260 by ewatrrr(10682)   on 2011-01-26 12:32:53 (Show Source): You can put this solution on YOUR website! ``` Hi log10,000 10^y = 10,000 y = 4 ```
 Exponents-negative-and-fractional/400051: Eighty feet is what part of a mile? 1 solutions Answer 283259 by ewatrrr(10682)   on 2011-01-26 12:30:45 (Show Source): You can put this solution on YOUR website! ``` Hi 1mi = 5280ft 80/5280 = 1/66 of a mile ```
 Polynomials-and-rational-expressions/400039: Graph the function. y = (x - 3)(x + 4) 1 solutions Answer 283258 by ewatrrr(10682)   on 2011-01-26 12:27:33 (Show Source): You can put this solution on YOUR website! ``` Hi Using the vertex form of a parabola, where(h,k) is the vertex y = (x - 3)(x + 4) y = x^2 + x - 12 |expanding y = (x +1/2)^2 - 1/4 - 12 |completing the square y = (x + 1/2)^2 - 49/4 Vertex is Pt(-1/2,-49/4), line of symmetry x = -1/2 ```
 Polynomials-and-rational-expressions/400040: Graph the Function. y = (x + 3)(x - 4)1 solutions Answer 283257 by ewatrrr(10682)   on 2011-01-26 12:24:54 (Show Source): You can put this solution on YOUR website! ``` Hi Using the vertex form of a parabola, where(h,k) is the vertex y = (x + 3)(x - 4) y = x^2 -x - 12 |expanding y = (x- 1/2)^2 - 1/4 - 12 |completing the square y = (x- 1/2)^2 - 49/4 Vertex is Pt(1/2,-49/4), line of symmetry x = 1/2 ```
 Rational-functions/400035: write an equation of the line containing the given point and paralled to the given line (6,9)x+2Y=9 Thank you for your help!1 solutions Answer 283242 by ewatrrr(10682)   on 2011-01-26 11:45:57 (Show Source): You can put this solution on YOUR website! ``` Hi x+ 2y = 9 |solving for y y = -(1/2)x + 9/2 Slope m = (-1/2) Parallel lines have identical slopes: y = (-1/2)x + b |using ordered pair Pt( 6,9) to solve for b 9 = (-1/2)6 + b 12 = b y = (-1/2)x + 12 OR in standard form: x + 2y = 24 ```
 Mixture_Word_Problems/400034: a senior class is planning a trip to Chicago. a bus seats 51 people and a van seats 8. if there are 150 students going om the trip in a total of 8 vehicles how many buses and vans are taken on the trip?1 solutions Answer 283241 by ewatrrr(10682)   on 2011-01-26 11:40:27 (Show Source): You can put this solution on YOUR website! ``` Hi total of 8 vehicles Let x and (8-x) represent the number of buses and vans respectively Question states*** 51x + 8(8-x) = 150 Solving for x 43x + 64 = 150 43x = 86 x = 2, the number of buses. 6 vans (8-2) CHECKING our Answer*** 2*51 + 6*8 = 102 + 48 = 150 ```
 Distributive-associative-commutative-properties/400027: how do you find the slope and y-intercept for 4x-5y+3=2x-2y-31 solutions Answer 283237 by ewatrrr(10682)   on 2011-01-26 11:27:31 (Show Source): You can put this solution on YOUR website! ``` Hi 4x-5y+3=2x-2y-3 |Solving for y 2x + 6 = 3y y = (2/3)x + 2 Slope m = (2/3) and the y-intercept is Pt(0,2) ```
 Signed-numbers/400029: Is x= -2 a solution for 2x+4=0 yes or no?1 solutions Answer 283235 by ewatrrr(10682)   on 2011-01-26 11:23:34 (Show Source): You can put this solution on YOUR website! ``` Hi, Yes! 2x+4=0 2x = -4 x = -2 ```
 Trigonometry-basics/400008: can you find the center of the circle with these three points: (-8,5) (-14,-1) and (-2,-1)? 1 solutions Answer 283234 by ewatrrr(10682)   on 2011-01-26 11:22:20 (Show Source): You can put this solution on YOUR website! ``` Hi Pt(-8,-1) is the center of the circle, radius of 6 ```
 Linear-systems/400010: I am attempting to solve system of linear equations through elimination. I have an entire list of them due but if you can help me promptly with this one, I should be able to use it as a guide with the others. Thank you in advance. 2x-y+z=1 x+y-7=2 3x-y+z=0 1 solutions Answer 283232 by ewatrrr(10682)   on 2011-01-26 11:11:23 (Show Source): You can put this solution on YOUR website! ``` Hi solving system of linear equations through elimination 2x-y+z=1 x+y-7=2 3x-y+z=0 2x-y+z=1 3x-y+z=0 -2x +y -z=-1 |Mulitplying 1st equation by -1, prior to adding the equations 3x -y +z=0 x = -1 x+y-7=2 |Substituting x = -1 into an equation to solve for y -1 + y = 9 y = 10 3x-y+z=0 |Substituting x = -1 and y = 10 into an equation to solve for z -3 -10 + z = 0 z = 13 CHECKING our Answer*** 2x - y + z =1 -2 -10 + 13 = 1 ```