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# Recent problems solved by 'Fombitz'

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 Exponential-and-logarithmic-functions/363634: e^-t = 0.041 solutions Answer 259293 by Fombitz(13828)   on 2010-10-29 15:16:39 (Show Source): You can put this solution on YOUR website! or approximately,
 Exponents/363549: Factor Completly 40x^7+110x^6+25x^5 I got: 5x^5(8x^2+22x+5)1 solutions Answer 259254 by Fombitz(13828)   on 2010-10-29 11:25:32 (Show Source): You can put this solution on YOUR website! That's a good first step but you can further factor the quadratic.
 Word_Problems_With_Coins/363542: A bag contains 208 coins made up of dollars, quarters, dimes & nickels. The total equals \$77.10. How many of each type of coin are in the bag? So far I have: a=1.0, b=0.25, c=0.1, d=0.05 a+b+c+d=7 a+.25b+.1c+.05d=77.10 I have the answer through trial & error of 57 dollars, 56 quarters, 27 dimes & 68 nickels but can't figure out the complete system of equations to get me there. 1 solutions Answer 259252 by Fombitz(13828)   on 2010-10-29 11:23:39 (Show Source): You can put this solution on YOUR website! Where'd the come from?? . . . Let X be the number of dollars, Q quarters, D dimes, and N nickels. 1. 2. From eq. 1, Substituting, Since you do not have any other equations, you have a Diophantine equation in three variables. . . The procedure to solve it is not much different than trial and error so I'm not sure I'm adding much. Here's a link to show you how to solve these type of equations if you're interested. http://mathforum.org/library/drmath/view/61325.html
 Square-cubic-other-roots/363548: Multiply (5sqrt2+2)(5+sqrt10)1 solutions Answer 259251 by Fombitz(13828)   on 2010-10-29 11:11:25 (Show Source): You can put this solution on YOUR website!Use the FOIL Method,
 test/363546: The diameter of apples in a certain orchard are normally distributed with a mean of 5.55 inches and a standard deviation of 0.65 inches. Show all work. (A). What percentage of the apples in this orchard have diameters less than 5.8 inches? (B). What percentage of the apples in this orchard are larger than 6.3 inches? Could you explain the steps so I can understand? 1 solutions Answer 259250 by Fombitz(13828)   on 2010-10-29 11:08:45 (Show Source): You can put this solution on YOUR website! 65% . . . 87.6% of apples have diameter less than or equal to . 100%-87.6%=12.4% have diameters greater than . . . .
 Probability-and-statistics/363489: The diameter of apples in a certain orchard are normally distributed with a mean of 5.5 inches and a standard deviation of 0.65 inches. Show all work. What percentage of the apple in this orchard have diameters less than 5.8 inches? What percentage of the apples in this orchard are larger than 6.3 inches? I can work the first part but I don't undersand how to get the second part. Can anyone show me what to do? z(5.8) = (5.8 -5.55)/0.65 = 0.385 P(x < 5.8) = P(z < 0.385) = ?1 solutions Answer 259249 by Fombitz(13828)   on 2010-10-29 11:06:25 (Show Source): You can put this solution on YOUR website!First, your z value is off (you used 5.55 instead of 5.5). 67.8% . . . 89.1% of apples have diameter less than or equal to . 100%-89.1%=10.9% have diameters greater than . . . .
 Equations/363520: ∫(ln(x))/(√(x))1 solutions Answer 259246 by Fombitz(13828)   on 2010-10-29 11:01:19 (Show Source): You can put this solution on YOUR website!Integrate by parts, . . , , . . Substituting, . . . . . . . .
Graphs/363524: How do you graph -5x+2y>10?? I believe it has to be shaded also.
1 solutions

Answer 259243 by Fombitz(13828)   on 2010-10-29 10:55:02 (Show Source):
You can put this solution on YOUR website!

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Plot the line
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.
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Now choose a test point in either plane, not on the line.
(,) is a good choice.
Test the inequality.
If the inequality is satisfied, shade the region containing (,).
If not, shade the other region.

False, shade the region not containing (,)
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 Solved by pluggable solver: Plot Any Inequality Graphing function :

 Geometry_Word_Problems/363515: A sample of an alloy is in the shape of a solid sphere with a radius of 6.4cm. If this sphere is melted down and then cast into a cube, what is the length of an edge of the cube?1 solutions Answer 259207 by Fombitz(13828)   on 2010-10-29 09:17:53 (Show Source): You can put this solution on YOUR website!The volume of a sphere is, The volume of a cube is, The two volumes are equal. or approximately, cm
 Probability-and-statistics/363516: a box contains several slips of paper each slip is written an odd number between 2 and 10. without looking, you draw one slip of paper. what is the sample space for the experiment?1 solutions Answer 259206 by Fombitz(13828)   on 2010-10-29 09:13:46 (Show Source): You can put this solution on YOUR website!{3,5,7,9}
 Probability-and-statistics/363393: A set of 50 data values has a mean of 28 and a variance of 4. I. Find the standard score (z) for a data value = 31. II. Find the probability of a data value > 31. 1 solutions Answer 259205 by Fombitz(13828)   on 2010-10-29 09:13:12 (Show Source): You can put this solution on YOUR website! . . . Now using , find
 Angles/363469: Morning Everyone, Struggling on this particular question, on vectors and scalars, was just wondering if anybody could help. a) Draw an xy plane and show the vectors a=2i+3j and b=5i+j (need not be to scale). By constructing the appropriate parrallelogram, draw the resultant vector in terms of i and j. b) A particle P is acted upon by forces (measured in Newtons) F1= 3i-2j+5k F2= -i+7j-3k, F3= 5i-j+4k and F4 = -2j+3k. Show the magnitude of the resultant force F acting on P is sqrt134 Newtons. Many thanks in advance for any help 1 solutions Answer 259202 by Fombitz(13828)   on 2010-10-29 09:09:32 (Show Source): You can put this solution on YOUR website!a) . . . =(,) :Blue =(,) :Black =(,)=(,) :Green . . . b) =(,,) =(,,) =(,,) =(,,) ==(,,)=(,,)
 Quadratic_Equations/363495: write the following quadratic function in the vertex form. then, identify the axis of symmetry and vertex: y=3x^2-6x+11 solutions Answer 259197 by Fombitz(13828)   on 2010-10-29 08:47:04 (Show Source): You can put this solution on YOUR website!Complete the square. The vertex is (,). The vertex lies on the axis of symmetry . . . .
 Exponents-negative-and-fractional/363498: whats 64 raised 2/3 power1 solutions Answer 259195 by Fombitz(13828)   on 2010-10-29 08:43:28 (Show Source):
 Quadratic_Equations/363499: write the expression in quadratic form. 3x^24+4x^12+71 solutions Answer 259193 by Fombitz(13828)   on 2010-10-29 08:41:07 (Show Source): You can put this solution on YOUR website!Let ,
 Complex_Numbers/363443: i want help on factorin numbers ?1 solutions Answer 259146 by Fombitz(13828)   on 2010-10-28 23:46:20 (Show Source): You can put this solution on YOUR website!Do you have an example of what you need help on to narrow it down a bit??
 Matrices-and-determiminant/363246: how do u construct a 3x3 square martix,A, where(the i and j are little letters to the bottem of the A) Aij=i^2+2j-31 solutions Answer 259143 by Fombitz(13828)   on 2010-10-28 23:37:45 (Show Source): You can put this solution on YOUR website! . . . [A]=
 Probability-and-statistics/363254: how to calculate p=(-2.5820 < z < -2.0656) 1 solutions Answer 259141 by Fombitz(13828)   on 2010-10-28 23:33:40 (Show Source): You can put this solution on YOUR website!Find . Find .
 Mixture_Word_Problems/363259: Moonshine has 50 liters of 70% alcohol solution. How many liters of pure alcohol must be added to obtain an 80% alcohol solution?1 solutions Answer 259139 by Fombitz(13828)   on 2010-10-28 23:31:26 (Show Source): You can put this solution on YOUR website!Let A be the amount of 100% alcohol added. liters
 real-numbers/363295: 6.45 & 13/2 Find real number bewtween each pair of numbers1 solutions Answer 259138 by Fombitz(13828)   on 2010-10-28 23:28:40 (Show Source): You can put this solution on YOUR website! A number between and could be .
 Trigonometry-basics/363270: If f on my graph is (-5, -2) (-3, -1) (2,1) (-1, 1) (0,0) (1, -1) and g is (-3, -3) (-1, -3) (0,0) (2, -2) (3, 0) (4, -1) what is (f-g)(-1)1 solutions Answer 259136 by Fombitz(13828)   on 2010-10-28 23:27:30 (Show Source):
 Polynomials-and-rational-expressions/363275: I am suppose to complete a tablee if the function f is odd the x's are -8 -4 4 8 the f(X) are -6, ? -2 ? The question marks are the blanks in the table. Are the answers -4 and 0 correct??1 solutions Answer 259135 by Fombitz(13828)   on 2010-10-28 23:26:01 (Show Source): You can put this solution on YOUR website!No, the function is odd so . . . .
 logarithm/363442: i do not know the correct steps to solve for x. log sub 5 (5x-9)=41 solutions Answer 259133 by Fombitz(13828)   on 2010-10-28 23:23:44 (Show Source):
 test/363294: Please help me solve this equation: Explain why the following integrals are improper and determine whether they are convergent or divergent. Evaluate those that are convergent. a. b. c. d. 1 solutions Answer 259132 by Fombitz(13828)   on 2010-10-28 23:22:38 (Show Source): You can put this solution on YOUR website!a) Convergent, b) Convergent, c) Convergent, d) Convergent,
 Linear-equations/363304: Please help me solve 2y-5x+2=01 solutions Answer 259130 by Fombitz(13828)   on 2010-10-28 23:18:09 (Show Source): You can put this solution on YOUR website! It's the equation of a line.
 Mixture_Word_Problems/363312: How much water must be mixed with 5 pints of a solution that is 50% developer to produce a mixture that is 37% developer?1 solutions Answer 259129 by Fombitz(13828)   on 2010-10-28 23:16:58 (Show Source): You can put this solution on YOUR website!Water is a 0% solution. Let X be the amount of water added. pints or approximately, pints
 Functions/363397: If xy=0, what do you know about the location of point (x,y) on the coordinate plane? Explain. 1 solutions Answer 259128 by Fombitz(13828)   on 2010-10-28 23:12:44 (Show Source): You can put this solution on YOUR website!It lies either on the x-axis (y=0) or on the y-axis (x=0) or at the origin (0,0)
 test/363406: 4x - 2y + xy,when x= -1 and y= 51 solutions Answer 259127 by Fombitz(13828)   on 2010-10-28 23:11:36 (Show Source):
 Linear-equations/363425: y-x=17 y=4x+21 solutions Answer 259125 by Fombitz(13828)   on 2010-10-28 23:09:10 (Show Source): You can put this solution on YOUR website!1. 2. Substitute eq. 2 into eq. 1, Then from eq. 2,
 Linear-equations/363427: x-y=7 0.5x+y=51 solutions Answer 259124 by Fombitz(13828)   on 2010-10-28 23:07:38 (Show Source): You can put this solution on YOUR website!Add the equations. Now use either equation to solve for .
 Probability-and-statistics/363433: If the regression equation is y^=2-0.4x, what is the value of y^ when x =-3?1 solutions Answer 259122 by Fombitz(13828)   on 2010-10-28 23:06:12 (Show Source):