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# Recent problems solved by 'Alan3354'

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 expressions/260116: find the difference in elevation between 5,642 and -28 do I add or subtract the elevation -28m to or from the elevation______m1 solutions Answer 191557 by Alan3354(30954)   on 2010-01-23 19:13:37 (Show Source): You can put this solution on YOUR website!You want the difference between -28 and 5642. You have to move 28 to get from -28 to zero. Then, another 5642 to get to 5642. So you add them. ---------------- Or, = 5642 - (-28) = 5642 + 28 = 5670
 Linear-equations/260098: What is the x intercept for y= -3/4x+5. I have (6.75,0)which is wrong?1 solutions Answer 191541 by Alan3354(30954)   on 2010-01-23 17:49:27 (Show Source): You can put this solution on YOUR website!What is the x intercept for y= -3/4x+5. I have (6.75,0)which is wrong? ------------- At the x-intercept, y = 0 -------- 0 = -(3/4)x + 5 3x/4 = 5 3x = 20 x = 20/3
 percentage/260077: Nathan bought a set of in-line skates for \$29.40. They were 25% off the original price. What was the original price? Draw a diagram to help solve the problem.1 solutions Answer 191524 by Alan3354(30954)   on 2010-01-23 17:08:43 (Show Source): You can put this solution on YOUR website!Nathan bought a set of in-line skates for \$29.40. They were 25% off the original price. What was the original price? Draw a diagram to help solve the problem. -------------- \$29.40 is the remaining 75% after 25% off, = 3/4 of the original price. 29.40 = 0.75x x = 29.40/0.75 x = \$39.20 ------------- I can't think of any diagrams that might help.
 Linear-equations/260025: Write an equation of the line containing the given point and parallel to the given line. (4,-8); 4x-5y=41 solutions Answer 191493 by Alan3354(30954)   on 2010-01-23 15:26:45 (Show Source): You can put this solution on YOUR website!Do it like this one: ===================== A line and a point example. Write in standard form the eqation of a line that satisfies the given conditions. Perpendicular to 9x+3y=36, through (1,2) ----------------- Find the slope of the line. Do that by putting the equation in slope-intercept form, y = mx + b. That means solve for y. 9x+3y = 36 3y= - 9x + 36 y = -3x + 13 The slope, m = -3 ------------------ The slope of lines parallel have the same slope. The slope of lines perpendicular is the negative inverse, m = +1/3 ---------------- Use y = mx + b and the point (1,2) to find b. 2 = (1/3)*1 + b b = 5/3 The equation is y = (1/3)x + 5/3 (slope-intercept form) x - 3y = -5 (standard form) ------------------------ For further assistance, or to check your work, email me via the thank you note.
 Reduction-of-unit-multipliers/260048: how who u go about sloving 40 centimeters per second to miles per hour. and 1000 cubic centimeters to cubic feet1 solutions Answer 191477 by Alan3354(30954)   on 2010-01-23 14:25:51 (Show Source): You can put this solution on YOUR website!how who u go about sloving 40 centimeters per second to miles per hour. and 1000 cubic centimeters to cubic feet --------- It's not solving, it's converting. 1 inch = 2.54 cm exactly -------- 40 cm/sec = 40*60*60 cm/hour = 144000cm/hour = 144000/2.54 inch/hour = (144000/2.54)/(12*5280) miles/hr =~ 0.89477 mph ---------------- 1000 cc/(2.54*2.54*2.54) = cubic inches = (1000/2.54^3)/12^3 cubic ft =~ 0.0353 ft^3
 Graphs/260047: i need to graph 5x^2+3y=37 i know in order to graph it i need to isolate Y into Y=____ but i dont know how to go about that this is as far as i got 3y=-5x^2+37 but i dont know how to get the 3 away from y1 solutions Answer 191476 by Alan3354(30954)   on 2010-01-23 14:19:37 (Show Source): You can put this solution on YOUR website! i need to graph 5x^2+3y=37 i know in order to graph it i need to isolate Y into Y=____ but i dont know how to go about that this is as far as i got 3y=-5x^2+37 but i dont know how to get the 3 away from y ----------- Divide both sides by 3 y = (5/3)x^2 + 37/3
 Travel_Word_Problems/260028: How far will you drive if you drive 3 hours at 63 miles per hour? 1 solutions Answer 191465 by Alan3354(30954)   on 2010-01-23 12:11:18 (Show Source): You can put this solution on YOUR website!You have 2 numbers to work with. What would you guess?
 Distributive-associative-commutative-properties/260026: How do solve step by step x^2=40? I am suppposed to solve the equation. Thanks1 solutions Answer 191462 by Alan3354(30954)   on 2010-01-23 11:58:52 (Show Source): You can put this solution on YOUR website!There aren't many steps. x^2 = 40 x = +sqrt(40) = +2sqrt(10) x = -sqrt(40) = -2sqrt(10) --------------------------- Use a calculator, --> x =~ 6.324555
 Equations/260020: Is there a trick to factoring cubed or higher equations1 solutions Answer 191458 by Alan3354(30954)   on 2010-01-23 11:28:55 (Show Source): You can put this solution on YOUR website!no. There's no "trick" or procedure for the general case, but some are commonly known. ---------- a^3 + b^3 = (a+b)*(a^2 - ab + b^2) a^3 - b^3 - (a-b)*(a^2 + ab + b^2) ---------------------------------- The difference of any 2 even powered exponents (a^2n - b^2n) can be factored. The sum or difference of any 2 odd powered exponents can be factored. can be factored.
 Graphs/259987: identify the x and y intercepts 4x-5y=201 solutions Answer 191450 by Alan3354(30954)   on 2010-01-23 10:55:57 (Show Source): You can put this solution on YOUR website!identify the x and y intercepts 4x-5y=20 ----------------- The y-intercept is at x=0, and v.v. 4x-5y=20 -5y=20 y = -4 --> (0,-4) ----------------- 4x-5y=20 4x=20 x = 5 --> (5,0)
 Length-and-distance/259888: graph= -4/3x+8 and y=2/3x-4 and find area of figure1 solutions Answer 191444 by Alan3354(30954)   on 2010-01-23 10:42:50 (Show Source): You can put this solution on YOUR website!Assuming the 1st eqn is y=(-4/3)x + 8 The graphs give you 2 straight lines. They don't enclose an area.
 Volume/260003: What is the volume of a box which measures 2cm deep, 20cm long and 10cm high?1 solutions Answer 191440 by Alan3354(30954)   on 2010-01-23 10:28:40 (Show Source): You can put this solution on YOUR website!It's the product of the dimensions, 2*20*10 cc
 Triangles/259914: 1.two sides of a triangle are 10 and 20. Give all the values that the third side c can take i.e find x and y such that x1 solutions Answer 191371 by Alan3354(30954)   on 2010-01-22 21:21:30 (Show Source): You can put this solution on YOUR website!The 3rd side has to be >10 and <30. >(20 - 10) and <(20 + 10)
 test/258605: what is six less than the number of cars is 9?1 solutions Answer 191368 by Alan3354(30954)   on 2010-01-22 21:15:08 (Show Source): You can put this solution on YOUR website!It's a question about cars.
 test/259906: Factor 9y^2 – 12y + 41 solutions Answer 191367 by Alan3354(30954)   on 2010-01-22 21:14:07 (Show Source): You can put this solution on YOUR website!Did you try it? The 1st term is (3y)^2. The last term is 2^2.
 Polynomials-and-rational-expressions/259907: how do you divide1 solutions Answer 191366 by Alan3354(30954)   on 2010-01-22 21:13:29 (Show Source): You can put this solution on YOUR website!Very well. Thx for asking.
 test/259909: Factor 8 b^5c – 8 b^4c^2 +2b^3c^3 1 solutions Answer 191365 by Alan3354(30954)   on 2010-01-22 21:12:59 (Show Source): You can put this solution on YOUR website!Did you try it? Do you see any common factors? 2? b? c?
 Geometry_Word_Problems/259881: The hypotenuse of an isosceles right triangle measures 15 feet. Find the area. 1 solutions Answer 191363 by Alan3354(30954)   on 2010-01-22 21:10:15 (Show Source): You can put this solution on YOUR website!15^2 = 2s^2 Area = s^2/2 = 225/4 Area = 56.25 sq feet
 Geometric_formulas/244366: A fifty pound play sand will fill approximately1/2 cubit foot I want to fill it 3/4 high how many whole bags of sand will I need to purchase?1 solutions Answer 191345 by Alan3354(30954)   on 2010-01-22 19:52:16 (Show Source): You can put this solution on YOUR website!That depends on how big "it" is.
 Expressions-with-variables/259887: solve by the substitution method and then two ordered pairs! 9x-9y=-9 3x+13=y1 solutions Answer 191344 by Alan3354(30954)   on 2010-01-22 19:50:54 (Show Source): You can put this solution on YOUR website!solve by the substitution method and then two ordered pairs! 9x-9y=-9 --> 3x-3y = -3 --> 3x = 3y-3 3x+13=y --------- Sub for 3x into the 2nd eqn 3y-3 + 13 = y 3y+10 = y 2y = -10 y = -5 x = -6 -------- The only ordered pair of the solution is (-6,-5) ------------ PS Most people would have subbed for y into the 1st eqn, but that's not the only way to do it.
 Equations/259868: The sum of three consecutive even integers is 228. Find the integers.1 solutions Answer 191340 by Alan3354(30954)   on 2010-01-22 19:18:16 (Show Source): You can put this solution on YOUR website!228/3 = 76. That's the middle number. --> 74, 76, 78 ---------------- There are more complicated ways to do it, but what's the point?
 Geometry_proofs/259829: Explain how to construct a line parallel to a given line. Tell which theorem or postulate you use. 1 solutions Answer 191333 by Alan3354(30954)   on 2010-01-22 18:22:38 (Show Source): You can put this solution on YOUR website!Do you mean drawing a line? Or finding an equation of a line?
 Geometric_formulas/259590: Carlos leaves Los Angeles on a cross-country car trip at 8:00 a.m. He averages 50 miles per hour. Juanita plans to take exactly the same route, but does not leave until 9:00 a.m. She averages 60 miles per hour. Develop a diagram or table to determine at what time Juanita will pass Carlos. 1 solutions Answer 191332 by Alan3354(30954)   on 2010-01-22 18:13:15 (Show Source): You can put this solution on YOUR website!In 1 hour, from 0800 to 0900, Carlos has gone 50 miles. Juanita gains on him at 10 mph (60-50). She will pass him in 5 hours (50/10). 0900 + 500 = 1400, or 2 PM. -------------- I see no need for a diagram or a table.
 Equations/259839: Please help me simplify this equation: (5x+7y)-(3x-5y)1 solutions Answer 191305 by Alan3354(30954)   on 2010-01-22 16:52:25 (Show Source): You can put this solution on YOUR website!It's not an equation, there's no equal sign. (5x+7y)-(3x-5y) You can combine the x's and the y's = 2x + 12y That's all that can be done.
 Quadratic_Equations/259841: How do I solve the qauadratic equation -4x²=0.....I am really confused! Thank you in advance1 solutions Answer 191304 by Alan3354(30954)   on 2010-01-22 16:50:39 (Show Source): You can put this solution on YOUR website!-4x^2 = 0 x^2 = 0 x = 0
 Miscellaneous_Word_Problems/259789: A rectangle is placed inside a circle of radius r so the center of the rectangle and the center of the circle coincide, and the corners of the rectangle are on the circle. Express the area of the rectangle as a function of the length x of one of its sides.1 solutions Answer 191289 by Alan3354(30954)   on 2010-01-22 15:55:20 (Show Source): You can put this solution on YOUR website!Consider one quadrant: x^2 + y^2 = r^2 y = sqrt(r^2 - x^2) Area = x*y Area = x*sqrt(r^2 - x^2) Total area = 4xsqrt(r^2 - x^2) --------------------- To use x as one side, not 1/2 of one side: Area = 2x*sqrt(4r^2 - x^2)
 Linear-equations/259781: Im stuck on this question, can someone please help? Write an equation of a horizontal line passing through the two points (-2,-3) and (2,-3). Do not use any spaces in your answer.1 solutions Answer 191275 by Alan3354(30954)   on 2010-01-22 15:12:49 (Show Source): You can put this solution on YOUR website!y=-3 --------- emailmeviathethankyounoteifyouhaveanyquestions.
 Volume/259587: What is the volume of 1.0 liter expressed in mm3? 1 solutions Answer 191273 by Alan3354(30954)   on 2010-01-22 15:07:49 (Show Source): You can put this solution on YOUR website!What is the volume of 1.0 liter expressed in mm3? ---------------- Start with 1 liter = 1000 cc (cubic centimeters) 1 cm = 10 mm --> 1000 *10*10*10 = 1,000,000 mm^3 --------------- or, 1*10^6 mm^3 or, 1E6 mm^3 ---------------- It's a lot of zeroes, but it's better than multiplying by 1728.
 Numeric_Fractions/259801: hello i'm in 4th grade grade.I'm trying to figure out how to solve this algebra problems..... 10+50=80- _____ and 90-30=20+ _____ please show me how to do this. Thank you1 solutions Answer 191271 by Alan3354(30954)   on 2010-01-22 15:03:45 (Show Source): You can put this solution on YOUR website!10+50=80- _____ Add the 10 and 50 60 = 80 - ? Subtract 60 from both sides 0 = 20 - ? The missing value is 20. -------------------------- and 90-30=20+ _____ Subtrace the 30 from 90 60 = 20 + ? Subtract 20 from both sides 40 = ? 40 is the missing value.
 Linear-equations/259800: I need to figure out how to use point slope form to find the equation of the line with given properties and write the equation in general form. m= -7 passing through(3,0) = 21. thank you1 solutions Answer 191269 by Alan3354(30954)   on 2010-01-22 15:00:23 (Show Source): You can put this solution on YOUR website!I need to figure out how to use point slope form to find the equation of the line with given properties and write the equation in general form. m= -7 passing through(3,0) = 21. I don't know what the 21 means ?? -------------- Do it like this one. ------------------------ The slope, m = -3 ---------------- Use y = mx + b and the point (1,2) to find b. 2 = (1/3)*1 + b b = 5/3 The equation is y = (1/3)x + 5/3 (slope-intercept form) x - 3y = -5 (standard form) ------------------------ For further assistance, or to check your work, email me via the thank you note.
 Polygons/259797: An eight-point star-shaped polygon has a point angle of 36 degrees. What is the measure of its dent angle?. Also can you please show the work on how you came up with the solution?1 solutions Answer 191266 by Alan3354(30954)   on 2010-01-22 14:56:29 (Show Source): You can put this solution on YOUR website! An eight-point star-shaped polygon has a point angle of 36 degrees. What is the measure of its dent angle?. Also can you please show the work on how you came up with the solution? ------------- 8 points --> 16 sides The total interior angles of a 16-gon = 180*(14) = 2520 degs 8 points * 36 = 288 degs 2520-288 = 2232 degs for the other 8 angles 2232/8 = 279 degs each