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 'fractalier'

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, >>Next

 Radicals/37498: This question is from textbook hi i need your help on this problem please and thatnk you 6 the square root of 721 solutions Answer 23123 by fractalier(2101)   on 2006-05-12 11:28:07 (Show Source): You can put this solution on YOUR website!Please see my earlier solution of this problem...the answer is 36rad(2)
 Radicals/37503: This question is from textbook hi umm i really need help on radicals i get it but i got suck so can you help? here it goes 6/72 i hope the slash helps i dont have the radical sigh please and thank you1 solutions Answer 23121 by fractalier(2101)   on 2006-05-12 11:24:15 (Show Source): You can put this solution on YOUR website!See my earlier solution to this one...the answer is 36rad(2)
 Inequalities/37516: This question is from textbook Intermediate Algebra Find the area of a fenced yard with a length of 9 yards and width of 5 yards.1 solutions Answer 23120 by fractalier(2101)   on 2006-05-12 11:23:26 (Show Source): You can put this solution on YOUR website!If it is a rectangular yard, the area of it is found by A = l x w (that is, length times width) A = 9 x 5 = 45 square yards
 Matrices-and-determiminant/37509: This question is from textbook College Algebra Find det A, given A = [-1 0 1 2-1 3 0 1 5]1 solutions Answer 23118 by fractalier(2101)   on 2006-05-12 11:17:57 (Show Source): You can put this solution on YOUR website!This one is not easy to show here, but we can do it by the reduction-by-minors technique: (-1) times the rows and columns not including the -1 MINUS (0) times the rows and columns not including the 0 PLUS (1) times the rows and columns not including the 1 so we get (-1)(-5 - 3) - 0 + 1(2 - 0) = 8 - 0 + 2 = 10
 Inequalities/37514: This question is from textbook Evaluate 3x - 7y when x = -2 and y = -3.1 solutions Answer 23117 by fractalier(2101)   on 2006-05-12 11:13:12 (Show Source): You can put this solution on YOUR website!Here we substitute the given values for x and y into the expression 3x - 7y to get 3(-2) - 7(-3) = -6 - (-21) = -6 + 21 = 15
 Inequalities/37510: -2-4+7+3(-4)+171 solutions Answer 23116 by fractalier(2101)   on 2006-05-12 11:11:33 (Show Source): You can put this solution on YOUR website!We need to apply the order of operations, PEMDAS, when doing problems such as this: -2 - 4 + 7 + 3(-4) + 17 = Thus multiplying comes before adding and subtracting, and we get -2 - 4 + 7 - 12 + 17 = Then we add and subtract left to right as we find them...yielding 6 as our answer
 Inequalities/37512: This question is from textbook Intermediate Algebra Simplify: -3[-4+1]/(-9)1 solutions Answer 23115 by fractalier(2101)   on 2006-05-12 11:04:15 (Show Source): You can put this solution on YOUR website!From -3[-4+1] / (-9), we need to combine what's in the parentheses first, giving us (-3)(-3) / (-9) = 9 / -9 = -1
 Graphs/37417: The Graphs of ax+by=13 and ax-by=-3 instersect at (1,4). Find a and b.1 solutions Answer 23073 by fractalier(2101)   on 2006-05-11 18:10:34 (Show Source): You can put this solution on YOUR website!Since you know both lines go thru (1, 4), you can plug x = 1 and y = 4 in both and get a + 4b = 13 and a - 4b = -3 Now add equations and get 2a = 10 and a = 5 You can also subtract equations and get 8b = 16 b = 2
 Rational-functions/37416: Question goes like this.... Simplify each sum. 5x/x^2-9 + 2/x+41 solutions Answer 23071 by fractalier(2101)   on 2006-05-11 18:08:00 (Show Source): You can put this solution on YOUR website!Not too much you can do here, but from 5x/x^2-9 + 2/x+4 we can combine fractions and get [5x(x + 4) + 2(x^2 - 9)] / [(x + 4)(x - 3)(x + 3)] = [5x^2 + 20x + 2x^2 - 18] / [(x + 4)(x - 3)(x + 3)] = (7x^2 + 20x - 18) / [(x + 4)(x - 3)(x + 3)]
 Probability-and-statistics/37414: 8.38 x 10^7 feet - 5.84 x 10^7 feet 1 solutions Answer 23070 by fractalier(2101)   on 2006-05-11 18:03:35 (Show Source): You can put this solution on YOUR website!8.38 x 10^7 feet - 5.84 x 10^7 feet = 2.54 x 10^7 feet Leave the powers of ten alone and merely subtract the decimals. Of course you have to be sure that your answer is in proper scientific notation, which it is...
 Inverses/37415: my 3rd grader came home with this in her math homework & I can not figure it out _________ divided by 7 = 500 CAn you please help1 solutions Answer 23069 by fractalier(2101)   on 2006-05-11 18:01:41 (Show Source): You can put this solution on YOUR website!Yes. The question asks, "What number divided by 7 gives you 500?" In algebra we show that as x/7 = 500 We then multiply both sides by seven and get x = 3500
 Expressions-with-variables/37245: Solve each of the following systems by substitution. 4x – 12y = 5 -x + 3y = -11 solutions Answer 23068 by fractalier(2101)   on 2006-05-11 17:50:13 (Show Source): You can put this solution on YOUR website!Please see my earlier solution of this problem. It turns out that these two lines are parallel, thus no solution exists, and the system is said to be inconsistent.
 Rational-functions/37413: what is an extraneous root?1 solutions Answer 23067 by fractalier(2101)   on 2006-05-11 17:48:10 (Show Source): You can put this solution on YOUR website!Sometimes you solve an equation and get two answers. By plugging them in to the original equation to check, you discover one (or both) do not work. That is an example of an extraneous root. Very common in rational expressions/equations, and equations containing radicals.
 Graphs/37361: Is there a difference between solving a system of equations by the algebaraic method and the graphical method? Thank you!:)1 solutions Answer 23066 by fractalier(2101)   on 2006-05-11 17:46:00 (Show Source): You can put this solution on YOUR website!Well, you should arrive at the same solution. The algebraic method is more precise because trying to estimate exact solutions from a written diagram can be difficult...for example, you may think the solution from your graph is (2, 3) but it may actually be (2 1/8, 2 15/16)...tis hard to tell sometimes...especially with handwritten graphs and thick pencil lines...
 Expressions-with-variables/37411: a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a?1 solutions Answer 23065 by fractalier(2101)   on 2006-05-11 17:38:27 (Show Source): You can put this solution on YOUR website!Okay if a = b + 3(4 - c) when b = 5 and c = 2, we can find a by plugging in values for b and c...so we have a = b + 3(4 - c) = 5 + 3(4 - 2) = 5 + 3(2) = 5 + 6 = 11
 Graphs/37362: What is the situation when two linear inequalities have no solution? And what conditions need to be satisfied for a system of linear inequalities to have its solution in the first quadrant? Thank You :)1 solutions Answer 23064 by fractalier(2101)   on 2006-05-11 17:35:48 (Show Source): You can put this solution on YOUR website!Well for no solution to exist, the lines that govern them would need to be parallel and the shaded half-planes would have to be in opposite directions so that there is no overlapping of shaded areas. They could even represent the same line as long as they are both dotted and are shaded oppositely. For a system of inequalities to have a solution in the first quadrant, both (or all) shaded half-planes must intersect somewhere in the first quadrant.