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

 Square-cubic-other-roots/674643: I need to factor this problem in order to find the zeros of the function... Thank You!1 solutions Answer 419349 by ewatrrr(10682)   on 2012-11-01 12:29:55 (Show Source): You can put this solution on YOUR website!``` Hi Check factoring Using FOIL F First terms O Outside terms I Inside terms L Last terms ```
 Square-cubic-other-roots/674645: I need help factoring this to find the roots... Thank You!!1 solutions Answer 419348 by ewatrrr(10682)   on 2012-11-01 12:22:37 (Show Source): You can put this solution on YOUR website!``` Hi Check factoring Using FOIL F First terms O Outside terms I Inside terms L Last terms ```
 Polynomials-and-rational-expressions/674608: Simplify rational expressions: 12 _____ 6x-18 -21 _______ 7x-14 5x-10 ______ x-2 Can someone please help me to understand how to do these.1 solutions Answer 419346 by ewatrrr(10682)   on 2012-11-01 12:20:06 (Show Source): You can put this solution on YOUR website!``` Hi Simplify rational expressions: 'Reducing' by Finding Factors both Numerator and denominator have in Common ```
 Linear-equations/674360: Solve for x, y, and z variables of this systems of equations problem: 3x + 2y + z = 7, 5x + 5y + 4z = 3, 3x + 2y + 3z = 1 Please show steps1 solutions Answer 419184 by ewatrrr(10682)   on 2012-10-31 16:10:40 (Show Source): You can put this solution on YOUR website!``` Hi 3x + 2y + z = 7, 5x + 5y + 4z = 3 ||Mulitply 1st Eq by -5 and 2nd EQ by 3 and add || 3x + 2y + z = 7 3x + 2y + 3z = 1 2z = -6 z = -3, y = -1 and x = 4 ```
 test/674357: If a plant starts out as 12 inches and grows 4 inches a day how tall will it be in 44 1 solutions Answer 419181 by ewatrrr(10682)   on 2012-10-31 15:53:36 (Show Source): You can put this solution on YOUR website!``` Hi If a plant starts out as 12 inches and grows 4 inches a day how tall will it be in 44(days) H = ```
 Probability-and-statistics/674358: From a standard 52-card deck, how many 7-card hands will have 3 spades and 4 hearts?1 solutions Answer 419179 by ewatrrr(10682)   on 2012-10-31 15:51:54 (Show Source): You can put this solution on YOUR website!``` Hi From a standard 52-card deck, how many 7-card hands will have 3 spades and 4 hearts? cards in each suit ```
 Geometry_Word_Problems/674355: how to solve 7x-1=2x+51 solutions Answer 419178 by ewatrrr(10682)   on 2012-10-31 15:50:13 (Show Source): You can put this solution on YOUR website!``` Hi how to solve 7x-1=2x+5 ||Combine Like Terms by adding -2x and 1 to both sides of the EQ 5x = 6 x = 6/5 0r ```
 Angles/674351: If the measure of an angle exceeds the measure of its complement by 20, then the measure of the angle is1 solutions Answer 419177 by ewatrrr(10682)   on 2012-10-31 15:48:23 (Show Source): You can put this solution on YOUR website!``` Hi measure of an angle exceeds the measure of its complement by 20 x = (90°-x) + 20° 2x = 110° x = 55° and..(its complement is 35°) 55° = 35° + 20° ```
 Rate-of-work-word-problems/674348: If 7 guys take 8 days to build a trench, how many guys will it take to build the trench in 1/2 day?1 solutions Answer 419173 by ewatrrr(10682)   on 2012-10-31 15:32:41 (Show Source): You can put this solution on YOUR website!``` Hi If 7 guys take 8 days to build a trench, how many guys will it take to build the trench in 1/2 day? 112 guys = x ```
 Probability-and-statistics/674349: A class has 16 students, of which 3 are seniors. How many committees of size 3 can be selected if at least one member of each committee must be a senior?1 solutions Answer 419172 by ewatrrr(10682)   on 2012-10-31 15:25:59 (Show Source): You can put this solution on YOUR website!``` Hi A class has 16 students, of which 3 are seniors. non-seniors How many committees of size 3 can be selected if at least one member of each committee must be a senior? All possibilities - number of committees with no seniors ```
 Length-and-distance/674347: If the distance between two points on the coordinate axes is the square root of 65 , what could be the coordinates of the two points?1 solutions Answer 419171 by ewatrrr(10682)   on 2012-10-31 15:23:04 (Show Source): You can put this solution on YOUR website!``` Hi If the distance between two points on the coordinate axes is the square root of 65 , what could be the coordinates of the two points? D = for ex: (6, 8) (2, 1) D = ```
 Permutations/674336: In a standard normal distribution what percentage of the data is within 2 standard deviations of the mean?1 solutions Answer 419166 by ewatrrr(10682)   on 2012-10-31 14:54:58 (Show Source): You can put this solution on YOUR website!``` Hi For the normal distribution: one standard deviation from the mean accounts for about 68.2% of the set two standard deviations from the mean account for about 95.4% *** and three standard deviations from the mean account for about 99.7%. Important to Understand z -values as they relate to the Standard Normal curve: Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted. Note: z = 0 , 50% of the area under the curve is to the left and 50% to the right ```
 Quadratic_Equations/674313: Which steps transform the graph of y = x2 to y = –2(x – 2)2 + 2? A.) translate 2 units to the left, translate down 2 units, stretch by the factor 2 B.) translate 2 units to the right, translate up 2 units, stretch by the factor 2 C.) reflect across the x-axis, translate 2 units to the left, translate down 2 units, stretch by the factor 2 D.)reflect across the x-axis, translate 2 units to the right, translate up 2 units, stretch by the factor 21 solutions Answer 419165 by ewatrrr(10682)   on 2012-10-31 14:53:59 (Show Source): You can put this solution on YOUR website!``` Hi y = x^2 to Green y = –2(x – 2)^2 + 2 Blue D ```
 Finance/674329: I need step by step breakdown on the following; solve for EBIT (ebit-4000)(1-0.5)-0 / 2000 = (ebit-8250)(1-0.5)-0 / 1500. My text states the answer is 21000, which pans out, but it doesn't show the work it used to come up with the answer1 solutions Answer 419161 by ewatrrr(10682)   on 2012-10-31 14:44:34 (Show Source): You can put this solution on YOUR website!``` Hi EBIT = x | Cross Multiply to solve for x = 21000 750(x-4000) = 1000(x-8250) 1000*8250-750*4000 = 250x 5250000 = 250x 21000 = x ```
 Complex_Numbers/674290: Identify all zeroes of f(x)=x^3-4x^2-5x and write as a product of it's linear factors. 1 solutions Answer 419139 by ewatrrr(10682)   on 2012-10-31 12:46:01 (Show Source): You can put this solution on YOUR website!``` Hi f(x)=x^3-4x^2-5x = x(x^2-4x-5) = x(x-5)(x+1) zeroes: -1,0,5 ```
 Equations/674287: 16xsquare+8x/3xsquare multiplying 1-2x/8xsquare-21 solutions Answer 419138 by ewatrrr(10682)   on 2012-10-31 12:43:09 (Show Source): You can put this solution on YOUR website!``` Hi is this Your question?? ```
 Permutations/674285: How many different committees can be formed from 6 teachers and 47 students if the committee consists of 4 teachers and 2 students?1 solutions Answer 419137 by ewatrrr(10682)   on 2012-10-31 12:39:39 (Show Source): You can put this solution on YOUR website!``` Hi How many different committees can be formed from 6 teachers and 47 students if the committee consists of 4 teachers and 2 students? different committees ```
 Probability-and-statistics/674267: what is the probability that a value picked at random from the standard normal distribution will be between -1 and 1 is approximately______1 solutions Answer 419135 by ewatrrr(10682)   on 2012-10-31 12:37:52 (Show Source): You can put this solution on YOUR website!``` Hi For the normal distribution: one standard deviation from the mean accounts for about 68.2% of the set **** two standard deviations from the mean account for about 95.4% and three standard deviations from the mean account for about 99.7%. Important to Understand z -values as they relate to the Standard Normal curve: Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted. Note: z = 0 , 50% of the area under the curve is to the left and 50% to the right ```
 Linear-systems/674272: Make a graph for the following equation : 2x + y = 2 and x - y = 1 Please help me ! 1 solutions Answer 419131 by ewatrrr(10682)   on 2012-10-31 12:33:35 (Show Source): You can put this solution on YOUR website!``` Hi Make a graph for the following equation : 2x + y = 2 ||(x,y) ordered pairs (0,2) and (1,0) in this line. Plot and connect with a Line (Green) x - y = 1 ||(x,y) ordered pairs (0,-1) and (1,0) in this line. Plot and connect with a Line (Blue) Lines intersect at (x,y) ordered pair Pt(1,0)..the solution for this system of 2 EQs ```
 test/674277: To demonstrate probability, Mrs. McNamara had students draw marbles from a bag which contained 8 green marbles and 12 blue marbles. During the class, the bag was dropped, and 3 green marbles and 3 blue marbles were lost. Tell whether the loss of marbles changes the probability of drawing a green marble from the bag. If so, was the probability increased or decreased? Support your answer by calculating the probability for each situation. 1 solutions Answer 419123 by ewatrrr(10682)   on 2012-10-31 12:22:22 (Show Source): You can put this solution on YOUR website!``` Hi bag containing marbles: 8 green marbles and 12 blue marbles draw one P(green) = 8/20 = 2/5 (28/70) bag containing marbles: 5 green marbles and 9 blue marbles draw one P(green) = 5/14 (25/70) 25/70 < 28/70 As the fractional amount of green marbles decreases, there is less probability of drawing it ```
 Linear-systems/674276: Which of the following equations will produce a graph with the intersection of two lines at the positive 2 on the x axis? A. 3x - 2y =6 2x+y=4 B. -3x-2y=6 -2x+y=4 C. 3x + 2y=6 2x-y= 4 D. 3x - 2y =-6 2x+y = -4 1 solutions Answer 419120 by ewatrrr(10682)   on 2012-10-31 12:14:28 (Show Source): You can put this solution on YOUR website!``` Hi two lines intersecting at the positive 2 on the x axis. That would mean the two lines both have x-intercepts = 2 That is... when y = 0 ⇒ x = 2 A. 3x - 2y =6 || y = 0 ⇒ x = 2 2x + y =4 || y = 0 ⇒ x = 2 C. 3x + 2y=6 || y = 0 ⇒ x = 2 2x - y= 4 || y = 0 ⇒ x = 2 ```
 test/674264: Hi my name is Dorothy and I need help with algebra. So that is why I am looking for a tutor to improve in it.1 solutions Answer 419118 by ewatrrr(10682)   on 2012-10-31 12:06:07 (Show Source): You can put this solution on YOUR website!``` Hi Please give an example.. On this help site, people post a particular problem, many of those problems posted are Algebra problems that students have questions about or are having difficulty solving. What type of help are You needing. ewatrrr ```
 Probability-and-statistics/674253: A fair coin is tossed until a head appears.The probability that 3 throws are necessary. I considered 1/2*1/2*1/2=1/8 But the answer is 1/2*1/2 only=1/4. Please suggest.1 solutions Answer 419117 by ewatrrr(10682)   on 2012-10-31 11:46:42 (Show Source): You can put this solution on YOUR website!``` Hi consider the sample space: P(3 throws necessary) = 1-6/8 = 2/8 = 1/4 THT THH HHH HHT HTH HTT TTT TTH ```
 Functions/674239: im having trouble finding the domain for f(x)=1/x^2-4x-5 and plugging in 1, -2, -x, 2y and 2-h into f(x) = 2 IxI+ 3x1 solutions Answer 419115 by ewatrrr(10682)   on 2012-10-31 11:23:55 (Show Source): You can put this solution on YOUR website!``` Hi finding the domain for When: (x+1)(x-5)= 0, x = -1 0r x = 5 domain is all real numbers except x = -1 and x = 5 Denominator cannot be ZERO ```
 Numeric_Fractions/674249: using sythetic division find 4x^3-3x+15/X+31 solutions Answer 419109 by ewatrrr(10682)   on 2012-10-31 11:07:20 (Show Source): You can put this solution on YOUR website! ``` Hi using sythetic division find (4x^3-3x+15)/(x+3) using Synthetic Divsion -3 4 0 -3 15 -12 36 -99 4 -12 33 -84 results in: 4x^2 - 12x + 33 R = -84 ```
 Mixture_Word_Problems/674251: How much salt is there in 50 gallons of a 3% salt solution?1 solutions Answer 419107 by ewatrrr(10682)   on 2012-10-31 10:55:41 (Show Source): You can put this solution on YOUR website! ``` Hi, How much salt is there in 50 gallons of a 3% salt solution? = 1.5gal ```
 test/674236: Find a quadratic equation with roots -1+4i and -1-4i1 solutions Answer 419106 by ewatrrr(10682)   on 2012-10-31 10:53:18 (Show Source): You can put this solution on YOUR website! ``` Hi, The factor theorem states that a polynomial f(x) has a factor (x − k) if and only if f(k) = 0 roots -1+4i and -1-4i f(x) = a(x-(-1+4i))(x -(-1-4i)) = a(x^2 -2x +17) a = 1 f(x) = x^2 -2x +17 Check product Using FOIL F First terms O Outside terms I Inside terms L Last terms ```
 Equations/674244: Please help me solve this equation:(6x-7)/4+(3x-5)/7=(5x+78)/281 solutions Answer 419105 by ewatrrr(10682)   on 2012-10-31 10:43:29 (Show Source): You can put this solution on YOUR website! ``` Hi, |Multiplying thru by 28 so as all denominators = 1 7(6x-7) + 4(3x-5) = 5x + 78 42x - 49 + 12x - 20 = 5x + 78 ||Combining Like Terms 49x = 147 x = 3 and ```
 Polynomials-and-rational-expressions/674240: Find a polynomial f(x) of degree 3 with real coefficients and the following zeros 1, 3-i. f(x)=________ I need help please, and thanks so much!! :)1 solutions Answer 419104 by ewatrrr(10682)   on 2012-10-31 10:39:07 (Show Source): You can put this solution on YOUR website! ``` Hi, The factor theorem states that a polynomial f(x) has a factor (x − k) if and only if f(k) = 0 zeroes 1, 3-i (and 3+i) f(x) = (x-1)(x-(3-i))(x-(3+i) = (x-1)(x^2 - 6x + 10) = x^3-7x^2 +16x - 10 ```
 percentage/674241: what is 108% of 7141 solutions Answer 419103 by ewatrrr(10682)   on 2012-10-31 10:29:48 (Show Source): You can put this solution on YOUR website! ``` Hi, 108% 'of' 714 is ```
 Human-and-algebraic-language/674230: from 1960 to 2000 the cost C (in billions of 1992 dollars) to regulate social and economic programs could be approximated by the formula C=0.35x - 684 during year x. estimate the year in which the cost reached 6.6 billion1 solutions Answer 419102 by ewatrrr(10682)   on 2012-10-31 10:28:15 (Show Source): You can put this solution on YOUR website! ``` Hi, C=0.35x - 684 estimate the year in which the cost reached 6.6 billion ```