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# Recent problems solved by 'Fombitz'

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 Graphs/322935: Find the slope and the y-intercept of the line 8X+4Y=121 solutions Answer 231179 by Fombitz(13828)   on 2010-07-16 11:18:40 (Show Source): You can put this solution on YOUR website!Put the equation in slope-intercept form, Slope: Intercept . . .
 Systems-of-equations/322947: If 5a-b=9 and 3a+b=15, then a=b=?1 solutions Answer 231178 by Fombitz(13828)   on 2010-07-16 11:16:18 (Show Source): You can put this solution on YOUR website!Add the two equations together to eliminate b. Then use either equation to solve for y.
 Polynomials-and-rational-expressions/322941: Hello, ihow do i show my work for this problem 12r^10s^7/4r^2s1 solutions Answer 231177 by Fombitz(13828)   on 2010-07-16 11:13:18 (Show Source):
 Probability-and-statistics/322921: A box contains a total of 50 textbooks, of which 10 are biology books. If you select 2 at random, determine the probability that neither is a biology book. 1 solutions Answer 231164 by Fombitz(13828)   on 2010-07-16 08:48:16 (Show Source): You can put this solution on YOUR website! P(1st not biology)= P(2nd not biology)= P(2 books not biology)=
 Linear-equations/322924: Pls. help me understand how to do these math. Find the slope and the y-intercept. 1. y= 4x -9 2. y= -2x plus 3 3. -2x -8y =161 solutions Answer 231163 by Fombitz(13828)   on 2010-07-16 08:33:12 (Show Source): You can put this solution on YOUR website!The slope intercept form of a line is where is the slope and is the intercept. . . . 1. , 2. You fill in the answer on this one. 3. Sometimes you have to move terms around to get it into slope-intercept form, Again, read off the slope and intercept.
 Graphs/322925: graph ((y-2)2)/4-((x+3)2)/16=11 solutions Answer 231162 by Fombitz(13828)   on 2010-07-16 08:30:51 (Show Source):
 real-numbers/322875: List in order from the least to the greatest. 2/3,-1/7,1/3,-2/7,-2/3,2/5,-1/3,-2/5,9/81 solutions Answer 231138 by Fombitz(13828)   on 2010-07-15 22:17:58 (Show Source): You can put this solution on YOUR website!Find a common denominator, . . . {-560, -336, -280, -240,-120,280,336,560,945} {-2/3,-2/5,-1/3,-2/7,-1/7,1/3,2/5,2/3,9/8}
 Functions/322839: determine the equation of the line described. put answer in slope-intercept form, if possible. Through (-8,1), perpendicular to 5x+3y=-131 solutions Answer 231137 by Fombitz(13828)   on 2010-07-15 22:08:54 (Show Source): You can put this solution on YOUR website! Perpendicular lines have slopes that are negative reciprocals, . . . Use the point (-8,1) to solve for . . . . . .
 Polynomials-and-rational-expressions/322807: -2a^2/3a^2*20a/15a^31 solutions Answer 231135 by Fombitz(13828)   on 2010-07-15 22:03:07 (Show Source):
 Expressions-with-variables/322781: 15^=x^+(x+3)^21 solutions Answer 231134 by Fombitz(13828)   on 2010-07-15 21:59:01 (Show Source): You can put this solution on YOUR website!I assume you mean like this, Two solutions: . . .
 Linear_Equations_And_Systems_Word_Problems/322824: A chemist has one solution that is 80% acid and a second solution that is 44% acid. She wants to combine the solutions to make a new solution that is 53% acid. If she needs to make 320 Milliliters of this new solution, how many milliliters of the two solutions should be mixed? 1 solutions Answer 231133 by Fombitz(13828)   on 2010-07-15 21:55:14 (Show Source): You can put this solution on YOUR website!Let A be the amount of 80% solution, B the amount of 44% solution. 1. . . . 2. From eq. 1, Substitute into eq. 2, Then from eq. 1, . . . 80 ml of 80% solution and 240 ml of 44% solution.
 Quadratic_Equations/322680: factor if possible: x^4 + 22x^2 + 1211 solutions Answer 231042 by Fombitz(13828)   on 2010-07-15 16:05:16 (Show Source):
 Quadratic_Equations/322749: The hypotenuse of a right triangle has a length of 13 cm. the sum of the lengths of the other two sides is 17. Find the unknown lengths. 1 solutions Answer 231040 by Fombitz(13828)   on 2010-07-15 16:04:22 (Show Source): You can put this solution on YOUR website! From eq. 2, Substitute into eq. 1, Two solutions: Then from eq. 2, . . . Then, . . . The other two sides are 5 and 12 cm long.
 Quadratic_Equations/322709: x^+12=0 solve by any method factoring, extracting square roots, or completing square1 solutions Answer 231038 by Fombitz(13828)   on 2010-07-15 16:01:10 (Show Source):
 Human-and-algebraic-language/322719: Lydia takes ten minutes more to complete an illustration than Tom. The total time taken by both of them is six hours. How much time did each require?1 solutions Answer 231037 by Fombitz(13828)   on 2010-07-15 15:59:59 (Show Source): You can put this solution on YOUR website!Convert to consistent units, minutes. . . . . . . Substituting form above, . . . Tom's time was 175 minutes, Linda's time was 185 minutes.
 Probability-and-statistics/322703: A math test was given; a sample of the scores yielded the following results: 27, 21, 82, 79, 30, 58, 86, 6, 3, 59, 48, 86, 1, 61, 88, 21 Find the range, standard deviation, and variance for the sample scores1 solutions Answer 231034 by Fombitz(13828)   on 2010-07-15 15:53:29 (Show Source): You can put this solution on YOUR website!Range: Mean: Standard Deviation: Variance:
 Polynomials-and-rational-expressions/322684: factor 2^16 - 1 1 solutions Answer 231033 by Fombitz(13828)   on 2010-07-15 15:47:12 (Show Source): You can put this solution on YOUR website!It's the difference of two squares.
 Complex_Numbers/322760: is the actual equation the complex number? example: 2-3i 1 solutions Answer 231032 by Fombitz(13828)   on 2010-07-15 15:39:45 (Show Source): You can put this solution on YOUR website!Yes, the whole expression (2-3i) is the complex number made up of the real part (2) and the imaginary part (-3i).
 Sequences-and-series/322756: what two numbers whose product is -56 but whose sum is 101 solutions Answer 231030 by Fombitz(13828)   on 2010-07-15 15:33:28 (Show Source): You can put this solution on YOUR website!Let A and B be the numbers. 1. 2. Useing eq. 1, Substitute into eq. 2, Two solutions: Then from eq. 1, . . . Then from eq. 1,. . . . 14 and -4 are the two numbers.
 Radicals/322757: (square root of 7+square root of 10)Times(Square root of 7-square root of 101 solutions Answer 231029 by Fombitz(13828)   on 2010-07-15 15:30:36 (Show Source): You can put this solution on YOUR website!Use the FOIL method,
 Sequences-and-series/322742: 1/9 - 1/y² (y squared) ______________________(divided by) 1/3 + 1/y1 solutions Answer 231027 by Fombitz(13828)   on 2010-07-15 15:27:44 (Show Source):
 Expressions-with-variables/322753: how do i solve y=4x-8 and y=2x+10 using substitution?1 solutions Answer 231025 by Fombitz(13828)   on 2010-07-15 15:08:52 (Show Source): You can put this solution on YOUR website!1. 2. Substitute for y in eq. 1 using eq. 2, Now use either equation to solve for y,
 Equations/322745: P=sigma*A*e*T^4 solve for T how would I simplify this having T by itself? 1 solutions Answer 231020 by Fombitz(13828)   on 2010-07-15 14:56:45 (Show Source):
 Inverses/322748: 6t+18=181 solutions Answer 231019 by Fombitz(13828)   on 2010-07-15 14:55:25 (Show Source): You can put this solution on YOUR website! <--- Subtract 18 from both sides. <--- Divide both sides by 6.
 Complex_Numbers/322743: Please help me figure out how to find the complex zeros of the equation: f(x)=4x^3+19x^2-61x+141 solutions Answer 231018 by Fombitz(13828)   on 2010-07-15 14:54:21 (Show Source): You can put this solution on YOUR website!Since there are three roots and complex roots come in pairs, at least one must be real. All three roots are real for this equation. Looks like and are roots. Verify using the equation. I'll do one, you verify the other. . . . Now that you have two factors. You can use polynomial long division to find the remaining factor.
 Quadratic_Equations/322710: x^+85=18x solve by any method ( factoring, extracting square roots, or completing the square)1 solutions Answer 231016 by Fombitz(13828)   on 2010-07-15 14:40:42 (Show Source):
 Linear_Equations_And_Systems_Word_Problems/322718: Determine solution: 2x+3y+7z=13 3x+2y-5z=-22 5x+7y-3z=281 solutions Answer 231015 by Fombitz(13828)   on 2010-07-15 14:39:17 (Show Source): You can put this solution on YOUR website!I used matrix inversion to solve.
 Quadratic_Equations/322707: Quadratic equation solve by completing the square x^+26x-84=01 solutions Answer 231014 by Fombitz(13828)   on 2010-07-15 14:36:42 (Show Source):
 Linear-equations/322699: How do I find the equation for: x intercept -3, y intercept 5?1 solutions Answer 231013 by Fombitz(13828)   on 2010-07-15 14:34:17 (Show Source): You can put this solution on YOUR website! When , , . . . When , . . .
 Quadratic_Equations/322675: Factor, if possible t^6 - 18t^3 + 811 solutions Answer 231012 by Fombitz(13828)   on 2010-07-15 14:30:08 (Show Source): You can put this solution on YOUR website!Substitute. Let ,
 test/322731: What is the standard form of an equation of the line that passes through the point (-1, 5) and has a slope of 1/2?1 solutions Answer 231010 by Fombitz(13828)   on 2010-07-15 14:25:02 (Show Source): You can put this solution on YOUR website!Use the point-slope form of a line,