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# Recent problems solved by 'MathLover1'

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 Probability-and-statistics/734489: Hello, please help with this question. I'm stuck The lengths, in inches, of a sample of eight Brazilian Barking Treefish are given below.11, 17, 24, 26, 27, 29, 34, 42 Round the following to 2 DECIMAL PLACES if necessary. Find the sample mean weight. Find the sample standard deviation. 1 solutions Answer 448989 by MathLover1(6611)   on 2013-04-06 16:06:22 (Show Source): You can put this solution on YOUR website!The sample mean is the average and is computed as the sum of all the observed outcomes from the sample divided by the total number of events. Variance and Standard Deviation: Step by Step Calculate the mean,. Write a table that subtracts the mean from each observed value. ------- ------- -------------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- ------- Total: Divide by where is the number of items in the sample. This is the . To get the we take the square root of the variance.
 logarithm/734457: log10x-log(x-3)=log21 solutions Answer 448948 by MathLover1(6611)   on 2013-04-06 13:55:21 (Show Source):
 Linear-systems/734463: The answer is I know how to get the How do I get the 250 part?1 solutions Answer 448945 by MathLover1(6611)   on 2013-04-06 13:45:20 (Show Source): You can put this solution on YOUR website!...if you have , just multiply exponents and you will have = = =...if you have , just add exponents and you will have = =
 Equations/734462: Solve for b 21=+b1 solutions Answer 448943 by MathLover1(6611)   on 2013-04-06 13:36:19 (Show Source):
 Trigonometry-basics/734460: How can I evaluate cotangent of 37pi over 6 without using a calculator?1 solutions Answer 448937 by MathLover1(6611)   on 2013-04-06 13:30:08 (Show Source): You can put this solution on YOUR website!evaluate the ............ degrees ...=> cot will be same as degrees write as = = = =
 Expressions-with-variables/734442: How do I divide and simplify to lowest terms? 5x^2-20x/8x-5 diveded by x-4/8x-51 solutions Answer 448936 by MathLover1(6611)   on 2013-04-06 13:27:20 (Show Source):
 Trigonometry-basics/734450: How do I evaluate the cotangent of 37pi over 6?1 solutions Answer 448935 by MathLover1(6611)   on 2013-04-06 13:20:18 (Show Source): You can put this solution on YOUR website! evaluate the ............ degrees ...=> cot will be same as degrees write as = = = =
 Expressions-with-variables/734445: Find the LCM of x^2+9x,x^2-9x1 solutions Answer 448931 by MathLover1(6611)   on 2013-04-06 13:00:41 (Show Source): You can put this solution on YOUR website! .....factor .....factor the LCM is:
 �t�e�s�t/734301: In a right triangle angle B is 90 degrees and side AB is 1 cm longer than side BC. If the perimeter of the triangle is 70 cm.Find the length. Can you please help me out? Thanks so much in advance:)1 solutions Answer 448867 by MathLover1(6611)   on 2013-04-05 22:08:32 (Show Source): You can put this solution on YOUR website! length : length : length : It follows that: given perimeter , then ...factor solutions: If , then , and it is not a solution for because must be less than . If , then . Hence, . so, length : length : length :
 logarithm/734311: how do i write the given expressions as a single lograithm -5ln(x)+ln(4y)-ln(3z) AND 2log(4x)-5[log(x)-log(y-3)]1 solutions Answer 448858 by MathLover1(6611)   on 2013-04-05 21:14:13 (Show Source):
 Polynomials-and-rational-expressions/734291: (x-3)^41 solutions Answer 448831 by MathLover1(6611)   on 2013-04-05 19:33:48 (Show Source):
 Polynomials-and-rational-expressions/734204: 1/x+2 - 4/x-21 solutions Answer 448827 by MathLover1(6611)   on 2013-04-05 19:01:03 (Show Source):
 Quadratic_Equations/734229: factor the polynomial completely 4 - 81ysquared1 solutions Answer 448778 by MathLover1(6611)   on 2013-04-05 15:39:34 (Show Source):
 Equations/734232: Factor the polynomial completely. 4y(d+2)+3e(d+2)1 solutions Answer 448777 by MathLover1(6611)   on 2013-04-05 15:37:50 (Show Source):
 Equations/734238: factor the trinomial completely. 10y squared - 5y - 5.1 solutions Answer 448776 by MathLover1(6611)   on 2013-04-05 15:36:40 (Show Source): You can put this solution on YOUR website! ...write as ...group
 Exponents-negative-and-fractional/734233: x^-2 multiplied by x^-31 solutions Answer 448775 by MathLover1(6611)   on 2013-04-05 15:31:18 (Show Source):
 Equations/734226: Factor the following perfect square trinomial. 64z squared + 16z + 11 solutions Answer 448771 by MathLover1(6611)   on 2013-04-05 15:02:53 (Show Source):
 Equations/734114: A car travels for 25min at a constant speed for 45km how fast is the car traveling1 solutions Answer 448724 by MathLover1(6611)   on 2013-04-05 08:26:42 (Show Source): You can put this solution on YOUR website!if a car travels for , then the car is traveling ....=>
 Quadratic-relations-and-conic-sections/734009: Hi there! Well I was wondering if I could please get some help finding the center and foci of this hyperbola. It would be good if I could see the work so I could understand the problem better. (y + 2) ^ 2 /4 - x ^ 2 / 12 = 1 thank you so much!1 solutions Answer 448689 by MathLover1(6611)   on 2013-04-04 23:23:12 (Show Source): You can put this solution on YOUR website! where and are the coordinates of the center , ,; so, the center is at (,) ...=> ....the semi-transverse axis is unit long ...=> ...the semi-conjugate axis is units long focus: and .....The foci are units right and left of the center: (,)=(,) and (,)=(,)
 Geometry_Word_Problems/734028: The radius of a circle is 5 kilometers. What is the area of a sector bounded by a 180° arc?1 solutions Answer 448686 by MathLover1(6611)   on 2013-04-04 22:02:26 (Show Source): You can put this solution on YOUR website!The radius of a circle is . the area of a sector bounded by a ° arc is equal of area of the full circle or equal to a semicircle area
 percentage/733890: Hi, I'm having some trouble with math work and need some help. Please show the work with it. What is 92 percent of 175? What is 20 percent of 115? What percent of 115 is 69? 23 is 46 percent of what? 57 is 30 percent of what? What is 44 percent of 25? What percent of 84 is 63? What percent of 350 is 77?1 solutions Answer 448653 by MathLover1(6611)   on 2013-04-04 20:27:43 (Show Source): You can put this solution on YOUR website!1. What is percent of ? %= and you have ; so, % of is 2. What is percent of ? and you have ; so, % of is 3. What percent of is ? you are looking for %= of that is equal to so, ......so, is % of 4. is percent of what? ......... is percent of 5. is percent of what? ......... is percent of 6. What is percent of ? %= and you have ; so, % of is 7. What percent of is ? 8. What percent of is ? ......... is % of
 Inequalities/733810: the cost.in dollars.Of publishing x books is C(x)=40.000 + 20x +0.0001x^2 .How many books can be published \$250.000?1 solutions Answer 448613 by MathLover1(6611)   on 2013-04-04 16:05:20 (Show Source): You can put this solution on YOUR website!given: \$ find solution: we need only positive solution since we are looking for number of books
 test/733808: I am really confused about algebra. Like problems such as: 2(x+3)=9+x..and other problems including more variables. Can someone please help me?1 solutions Answer 448608 by MathLover1(6611)   on 2013-04-04 15:43:02 (Show Source): You can put this solution on YOUR website! ....first multiply ....now isolate variable ; add to both sides ...cancel and on right side .....add to both sides ...cancel and on left side ...solution for variable and it is only solution that makes true
 Human-and-algebraic-language/733784: solve each equation algebraically, =1 solutions Answer 448599 by MathLover1(6611)   on 2013-04-04 15:03:31 (Show Source): You can put this solution on YOUR website! ...if so, then
 Equations/733782: (2x^2+9y^2-8)-(7x^2+9y^2-3)1 solutions Answer 448597 by MathLover1(6611)   on 2013-04-04 14:57:00 (Show Source):
 Polynomials-and-rational-expressions/733776: (28x^4)/(6y^4z^5)/(4xy^2)/(30z^5)1 solutions Answer 448595 by MathLover1(6611)   on 2013-04-04 14:18:48 (Show Source):
Coordinate-system/733775: find the equation in standard form for the line passing through the points (-3,5)and (5,-3)
1 solutions

Answer 448594 by MathLover1(6611)   on 2013-04-04 14:07:25 (Show Source):
You can put this solution on YOUR website!
 Solved by pluggable solver: FIND EQUATION of straight line given 2 points hahaWe are trying to find equation of form y=ax+b, where a is slope, and b is intercept, which passes through points (x1, y1) = (-3, 5) and (x2, y2) = (5, -3). Slope a is . Intercept is found from equation , or . From that, intercept b is , or . y=(-1)x + (2) Your graph:

 Linear-equations/733768: Given line AB, explain how to contruct a square with sides of length AB.1 solutions Answer 448593 by MathLover1(6611)   on 2013-04-04 14:05:59 (Show Source): You can put this solution on YOUR website! Use only a non-collapsible compass and a straight-edge (not a ruler), construct a square with sides AB. 1. Have the compass length as AB. 2. Draw a straight line XY with a straight edge of length much greater than AB. 3. Now mark a point P on XY. 4. With P as center cut an arc on line XY for Q. Now PQ = AB. 5. With P as center cut two arcs on either side of line XY. 6. With Q as center cut two arcs on either side of line XY, so that they make two points with the arcs drawn with P as center. 7. Mark those points as R and S. 8. Now join P, R, Q, S. 9. Now we have a parallelogram PRQS. PR = RQ = QS = SP parallelogram with all sides equal is a rhombus. 10. The Diagonals of the rhombus are perpendicular to each other 11. Now Draw a line UV with points R ans S. 12. Now mark the point at which RS cuts PQ as A. 13. With A as center cut an arc on UV to get the point C. 14. With A as center cut an arc on XY to get the point B. 15. With B as center cut an arc on one side of XY. 16. With C as center cut an arc which cuts the ac drawn with B as center to get the point D. 17. Now ABCD is the required Square with side AB. or use compass and ruler 1. Draw a line from the left side of your paper to the right using a ruler. Draw and label two endpoints. End point A will be on the left and end point B on the right. The distance from point A and point B will be labeled r. Distance r will be the length of each side of your square. Extend the line further to the right from point B to help in finding a new line that will be perpendicular to Line AB. 2. Draw a perpendicular line upwards from point B. Using distance r, mark and label a new end point C. This will be the second side of the square at an exact 90 degree angle. 3. Draw an arc with end point A as the center and r as the distance using a compass. Draw a second arc using end point C as the center and r as the distance. Mark and label where these two arcs meet as point D. This is the final corner for your square. 4. Connect end point A to point D with your ruler. Connect end point C to point D.
 Matrices-and-determiminant/733740: The third angle of an isosceles triangle is 16 dgree less than the sum of the two equal angles.Find three angles of the triangle.1 solutions Answer 448592 by MathLover1(6611)   on 2013-04-04 13:10:20 (Show Source): You can put this solution on YOUR website! An isosceles triangle is a triangle with (at least) two equal sides, then base angles are congruent. let the two equal angles be and so, third angle is if the third angle of an isosceles triangle is dgree less than the sum of the two equal angles, then ......since , we have ..solve for we know that the sum of all three angles in triangle is then we have: .......substitute and ....solve for then and
absolute-value/733742: Write an equation in slope-intercept form of the line through (2, -1) and (3, 4)
1 solutions

Answer 448583 by MathLover1(6611)   on 2013-04-04 12:24:18 (Show Source):
You can put this solution on YOUR website!
 Solved by pluggable solver: FIND EQUATION of straight line given 2 points hahaWe are trying to find equation of form y=ax+b, where a is slope, and b is intercept, which passes through points (x1, y1) = (2, -1) and (x2, y2) = (3, 4). Slope a is . Intercept is found from equation , or . From that, intercept b is , or . y=(5)x + (-11) Your graph:

 Quadratic_Equations/733732: 5x^2-30x+4y^2+24y+61=0 simple form 1 solutions Answer 448580 by MathLover1(6611)   on 2013-04-04 12:20:57 (Show Source): You can put this solution on YOUR website!....write as ...group