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Recent problems solved by 'scott8148'

scott8148 answered: 6619 problems
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Angles/616754: whats the complement of a 53 angle 1 solutions Answer 387881 by scott8148(6628)   on 2012-05-31 20:19:09 (Show Source): You can put this solution on YOUR website! 90 - 53

Quadratic-relations-and-conic-sections/616755: identify the conic section with the equation x^2 + y^2 - 6x - 4y - 68 = 0 1 solutions Answer 387880 by scott8148(6628)   on 2012-05-31 20:18:31 (Show Source): You can put this solution on YOUR website! x and y both squared, with equal coefficients ___ a circle

Equations/616753: how do you factor this quadratic equation? i keep trying but its not right. 12x^2+13x-4=0 1 solutions Answer 387879 by scott8148(6628)   on 2012-05-31 20:17:25 (Show Source): You can put this solution on YOUR website! (4x - 1)(3x + 4) = 0

logarithm/616752: Logx49=2 in exponential form...the x is suppose to be small Solve for the unknown variable: Log3X=5...the 3 is suppose to be small 1 solutions Answer 387878 by scott8148(6628)   on 2012-05-31 20:15:42 (Show Source): You can put this solution on YOUR website! x^2 = 49 3^5 = x

Inverses/616721: This final one completely throws me. Make x the subject. f= p sqrt(g-x) Thank you 1 solutions Answer 387877 by scott8148(6628)   on 2012-05-31 20:09:53 (Show Source): You can put this solution on YOUR website! dividing by p ___ f/p = sqrt(g-x) squaring ___ (f/p)^2 = g-x adding x and subtracting (f/p)^2 ___ x = g - (f/p)^2

Linear-equations/616687: Write an equations of the line containing the given point and perpendicular to the given line. (0,2); 2x+5y=3 1 solutions Answer 387876 by scott8148(6628)   on 2012-05-31 20:00:47 (Show Source): You can put this solution on YOUR website! swapping the x and y coefficients, and changing one of the signs; changes the slope to the negative reciprocal (perpendicular) 5x - 2y = ? ___ substitute the given point to find the new constant term 5(0) - 2(2) = -4 5x - 2y = 4

Surface-area/616391: find the volume and surface area of a cube with an edge length of 10 units 1 solutions Answer 387660 by scott8148(6628)   on 2012-05-30 19:59:38 (Show Source): You can put this solution on YOUR website! v = e^3 sa = 6 e^2

Reduction-of-unit-multipliers/616382: the profit of selling x tables is given by p(x)=20000+80x-0.4x^2. how many tables should be made to maximize profits? 1 solutions Answer 387659 by scott8148(6628)   on 2012-05-30 19:57:58 (Show Source): You can put this solution on YOUR website! the maximum is the vertex, on the axis of symmetry the equation is ___ x = -b / (2a) ___ from ax^2 + bx + c

Exponential-and-logarithmic-functions/616378: How do you solve 5^x=3 for x using logs? 1 solutions Answer 387658 by scott8148(6628)   on 2012-05-30 19:54:31 (Show Source): You can put this solution on YOUR website! x * log(5) = log(3)

Mixture_Word_Problems/616344: I have two problem on a quiz due tonight need simalar exaples to help me work my problems. . A dehydrated patient needs a 2.6% saline IV. Unfortunately, the hospital only has bags of 8% and 2% saline solutions. How many liters of each of these solutions should be mixed together to yield 2 liters of the desired concentration? . To buy both a new car and a new house, Tina sought two loans totaling $318,338. The simple interest rate on the first loan was 2.4%, while the simple interest rate on the second loan was 4.7%. At the end of the first year, Tina paid a combined interest payment of $14,761.81. What were the amounts of the two loans? please help thanks mia 1 solutions Answer 387656 by scott8148(6628)   on 2012-05-30 19:50:37 (Show Source): You can put this solution on YOUR website! (8%)(x) + (2%)(2 - x) = (2.6%)(2) (2.4%)(x) + (4.7%)(318338 - x) = 14761.81

Rectangles/616334: If a rectangular garden has perimeter of 36ft, and the garden covers the greatest possible area, what should its dimensions be? 1 solutions Answer 387655 by scott8148(6628)   on 2012-05-30 19:45:49 (Show Source): You can put this solution on YOUR website! a square is the rectangle with the greatest area for a given perimeter

Polynomials-and-rational-expressions/615981: factor the trinomial 4n^2-22n-42 1 solutions Answer 387428 by scott8148(6628)   on 2012-05-29 20:07:55 (Show Source): You can put this solution on YOUR website! (4n + 6)(n - 7)

Angles/615973: how do you calculate the angles of a kite when 2 angles(B and D) are equal and both equal 114 degrees and one other angle (A)is twice the measure of angle C 1 solutions Answer 387424 by scott8148(6628)   on 2012-05-29 20:06:11 (Show Source): You can put this solution on YOUR website! the sum of the angles of a quadrilateral (like a kite) is 360º 3C = 360 - 2(114)

Matrices-and-determiminant/615967: We're trying to help our soon with his math homework but we're totally stuck one this problem: A store has a sale on almonds, pecans and pistachios. One lb of almonds, one lb of pecans and one lb of pistachios cost $12. Two lbs of almonds and three lbs of pecans cost $16. Three lbs of pecans and two lbs pistachios cost $24. Find the price of each kind of nut. Thank you in advance for any help. 1 solutions Answer 387421 by scott8148(6628)   on 2012-05-29 20:02:44 (Show Source): You can put this solution on YOUR website! x=almond, y=pecan, z=pistachio x + y + z = 12 ___ A 2x + 3y = 16 ___ B 3y + 2z = 24 ___ C eliminating x ___ 2A - B ___ -y + 2z = 8 ___ D eliminating y ___ 3D + C ___ 8z = 48 solve for z, then substitute back to find y and x

Distributive-associative-commutative-properties/615958: two pumps were required to pump the water out of a submerged area after a hurricane. Pump A,the large of the two pumps can pump the water out in 36 hours,whereas it would take pump B 180 hours. both pumps were working for the first 9 hours until pump A broke. how long did it take pump B to pump out the remaining water? 1 solutions Answer 387418 by scott8148(6628)   on 2012-05-29 19:48:03 (Show Source): You can put this solution on YOUR website! in the 9 hrs that it runs, A pumps out 1/4 (9/36) of the water it takes B 135 hr (3/4 * 180) to pump the remaining 3/4; but B has been pumping for 9 hrs, so only 126 hrs to finish

Coordinate-system/615956: can you please solve this for me? 5x – 7y = -16, 2x + 8y = 26 1 solutions Answer 387416 by scott8148(6628)   on 2012-05-29 19:43:44 (Show Source): You can put this solution on YOUR website! multiplying the 2nd equation by 5/2 ___ 5x + 20y = 65 subtracting the 1st equation (to eliminate x) ___ 27y = 81 solve for y, then substitute back to find x

Travel_Word_Problems/615957: 1.) A bacteria culture contains 50 bacteria initially and doubles every hour. a.) find a function that models the number of bacteria after t hours b.) find the number of bacteria after 5 hours completely lost :( 1 solutions Answer 387414 by scott8148(6628)   on 2012-05-29 19:39:27 (Show Source): You can put this solution on YOUR website! the number of bacteria is multiplied by two every hour ___ b * 2 * 2 * 2...etc a.)f(t) = 50 * 2^t b.) f(5) = 50 * 2^5 = 50 * 32

Linear-equations/615939: i need an equation to match this data table x -3 -2 -1 0 1 2 3 y 5 9 13 17 21 25 29 1 solutions Answer 387395 by scott8148(6628)   on 2012-05-29 18:43:09 (Show Source): You can put this solution on YOUR website! x increases by one while y increases by 4, so the slope (m) is 4 when x is zero, y is 17; so the y-intercept (b) is 17 y = 4x + 17

Polynomials-and-rational-expressions/615936: x^3+6x^2+3x+18 1 solutions Answer 387393 by scott8148(6628)   on 2012-05-29 18:40:08 (Show Source): You can put this solution on YOUR website! separating ___ (x^3 + 6x^2) + (3x + 18) factoring ___ x^2 (x + 6) + 3 (x + 6) rearranging ___ (x^2 + 3)(x + 6)

Equations/615935: please help me it says to solve by using elimination method x + 8y = 14 -3x + 4y = 0 1 solutions Answer 387389 by scott8148(6628)   on 2012-05-29 18:35:38 (Show Source): You can put this solution on YOUR website! multiplying 1st equation by 3 ___ 3x + 24y = 42 adding 2nd equation (to eliminate x) ___ 28y = 42 solve for y, then substitute back to find x

Rectangles/615886: Ramon is designing a rectangular garden with a width of 8ft. The path that leads diagonally across the garden is 2ft longer than the length of the garden. How long is the path? 1 solutions Answer 387375 by scott8148(6628)   on 2012-05-29 17:11:33 (Show Source): You can put this solution on YOUR website! by Pythagoras ___ 8^2 + (p - 2)^2 = p^2

Triangles/615869: The hypotenuse of a right triangle is nine more than the shortest leg. The longer leg is only one more than the shortest leg. Find the length of the hypotenuse of the triangle. 1 solutions Answer 387349 by scott8148(6628)   on 2012-05-29 15:32:00 (Show Source): You can put this solution on YOUR website! (h - 9)^2 + (h - 8)^2 = h^2 h^2 - 18h + 81 + h^2 - 16h + 64 = h^2 h^2 - 34h + 145 = 0 factoring ___ (h - 5)(h - 29) = 0

Triangles/615868: the altitude to the hypotenuse of a right triangle divides the hypotenuse into segments 25 cm and 30 cm long. how long is the altitude?  1 solutions Answer 387346 by scott8148(6628)   on 2012-05-29 15:25:29 (Show Source): You can put this solution on YOUR website! 25 / a = a / 30

Age_Word_Problems/615867: my mum was 27 when i was born, 8 years ago she was twice as old as i shall be in 5 years time..how old am i now? 1 solutions Answer 387345 by scott8148(6628)   on 2012-05-29 15:22:37 (Show Source): You can put this solution on YOUR website! m = i + 27 m - 8 = 2(i + 5) substituting ___ (i + 27) - 8 = 2i + 10 ___ i + 19 = 2i + 10

Geometry_Word_Problems/615864: A rectangular garden measures by 33ft by 66ft . Surrounding (and bordering) the garden is a path 2ft wide. Find the area of this path. 1 solutions Answer 387342 by scott8148(6628)   on 2012-05-29 15:16:31 (Show Source): You can put this solution on YOUR website! [(66 + 4)(33 + 4)] - (66 * 33)

expressions/615863: Solve for x. 2x^2 - 7x = 4 1 solutions Answer 387340 by scott8148(6628)   on 2012-05-29 15:14:08 (Show Source): You can put this solution on YOUR website! 2x^2 - 7x - 4 = 0 factoring ___ (2x + 1)(x - 4) = 0 2x - 1 = 0 x - 4 = 0

Systems-of-equations/615860: How do I solve this system? x²+y²=10 xy=3 1 solutions Answer 387338 by scott8148(6628)   on 2012-05-29 15:10:40 (Show Source): You can put this solution on YOUR website! FOILing (x + y)^2 ___ x^2 + 2xy + y^2 substituting ___ (x + y)^2 = 10 + 2(3) = 16 taking square root ___ x + y = ± 4 xy = 3 ___ x = 3/y x + y = 4 ___ substituting ___ 3/y + y = 4 ___ 3 + y^2 = 4y ___ y^2 - 4y + 3 = 0 ___ (y - 3)(y - 1) = 0 ___ y = 3 AND 1 ___ solutions are (1,3) and (3,1) x + y = -4 ___ same technique ___ solutions are (-1,-3) and (-3,-1)

Numbers_Word_Problems/615859: I do not know where to start with this problem: A compass and a ruler together cost $4. The compass costs .90 more than the ruler. How much does the compass cost? I am 53 and have never understood how to do word problems. I can solve the equations but cannot come up with the equation itself. 1 solutions Answer 387336 by scott8148(6628)   on 2012-05-29 14:51:47 (Show Source): You can put this solution on YOUR website! "A compass" ___ c "and a ruler" ___ r "together cost $4" ___ c + r = $4 "The compass costs .90 more than the ruler" ___ c = r + $.90

expressions/615835: nine more than a numberr 1 solutions Answer 387333 by scott8148(6628)   on 2012-05-29 14:43:14 (Show Source): You can put this solution on YOUR website! n + 9

Money_Word_Problems/615831: Roberto invested some money at 8%, and then invested $2000 more than twice this amount at 12%. His total annual income from the two investments was $4720. How much was invested at 12%? 1 solutions Answer 387332 by scott8148(6628)   on 2012-05-29 14:42:42 (Show Source): You can put this solution on YOUR website! (8%)(x) + (12%)(2x + 2000) = 4720

Mixture_Word_Problems/615814: A yogurt company blends regular yogurt that is 4% fat with its no-fat yogurt to obtain low-fat yogurt that is 1% fat. How many pounds of non-fat yogurt must be mixed to obtain 60 pounds of low-fat yogurt? 1 solutions Answer 387317 by scott8148(6628)   on 2012-05-29 12:43:13 (Show Source): You can put this solution on YOUR website! (0%)(x) + (4%)(60 - x) = (1%)(60)