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# Recent problems solved by 'Alan3354'

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 Numeric_Fractions/551227: on negative number factions (eg. -7x) what do you do?1 solutions Answer 359558 by Alan3354(30983)   on 2011-12-31 11:41:45 (Show Source): You can put this solution on YOUR website!-7x is not a fraction.
 Linear-equations/551165: slope=m= y2-y1=55.9-59.5 x2-x1=1984-1964 m=-3.6= -0.18 20 y-intercept =b=+61 Can someone explain the steps to find +61 .I course understand all that is needed for finding the line of best fit. I just don't know where b=+61 comes into play. 1 solutions Answer 359557 by Alan3354(30983)   on 2011-12-31 11:40:14 (Show Source): You can put this solution on YOUR website! slope=m= y2-y1=55.9-59.5 x2-x1=1984-1964 m=-3.6= -0.18 20 y-intercept =b=+61 Can someone explain the steps to find +61 .I course understand all that is needed for finding the line of best fit. I just don't know where b=+61 comes into play. -------------- No idea. You typed it.
 Polynomials-and-rational-expressions/551228: Evaluate the polynomial for x=3 when x=3, 2x^2-3x+5=1 solutions Answer 359556 by Alan3354(30983)   on 2011-12-31 11:38:27 (Show Source): You can put this solution on YOUR website!2x^2-3x+5 ----- Sub 3 for x
 Quadratic_Equations/551206: Find the equation of the axis of symmetry for y=2x^2+8x-1. Use the formula x= -b/2a1 solutions Answer 359555 by Alan3354(30983)   on 2011-12-31 11:34:36 (Show Source): You can put this solution on YOUR website!Find the equation of the axis of symmetry for y=2x^2+8x-1. Use the formula x= -b/2a ------ a = 2, b = 8 Use the formula x= -b/2a
 Probability-and-statistics/551236: Find the sides (to 2 decimal places) of the following triangle: angle A = 45, angle B = 60, angle C = 75 1 solutions Answer 359554 by Alan3354(30983)   on 2011-12-31 11:33:09 (Show Source): You can put this solution on YOUR website!Find the sides (to 2 decimal places) of the following triangle: angle A = 45, angle B = 60, angle C = 75 ------------------ There's no unique solution, there are an infinite # of similar triangles. --------
 Coordinate-system/551221: Find the area of the region bounded by x = y3 , x+y=2 , y =01 solutions Answer 359543 by Alan3354(30983)   on 2011-12-31 09:20:01 (Show Source): You can put this solution on YOUR website!Find the area of the region bounded by x = y3 , x+y=2 , y =0 ------------ That's the area under y = x^3 from x=0 to x=1, and the x-axis, plus a triangle with vertices (1,0), (1,1) & (2,0). ----------- Under the curve: Int(x^3)dx = Area = 1/4 sq unit ---- The triangle is 1*1/2 = 1/2 sq unit Total = 3/4 sq unit
 Expressions-with-variables/551215: please can you help me solve this question? Write algebraic expressions for the following sentence. Billy had r pound coins and found another.How many pound coins did he have then? 1 solutions Answer 359540 by Alan3354(30983)   on 2011-12-31 06:13:46 (Show Source): You can put this solution on YOUR website!r + 1
 Travel_Word_Problems/551220: I'm really terrible... I tried hard to answer but I think my answer is wrong. My answer to the word problem I'm about to ask now is 3hrs and 33 minutes. I badly want to show my solution but I kind of misplaced it so here is my word problem. Two buses starts out from the same terminal and travel in opposite directions at the rates of 80 kph and 70 kph, respectively. In how many hours will they be 500 kilometers apart?1 solutions Answer 359539 by Alan3354(30983)   on 2011-12-31 06:13:11 (Show Source): You can put this solution on YOUR website!Two buses starts out from the same terminal and travel in opposite directions at the rates of 80 kph and 70 kph, respectively. In how many hours will they be 500 kilometers apart? ---------------- Going in opposite directions, their speeds are added --> 150 km/hr ---- d = r*t t = d/r = 500/150 t = 3.333 hrs = 3 hr 20 mins
 Trigonometry-basics/550922: For what numbers x, 0<=x<=2pi does sin x = -1? Can you please show me a step by step instruction on how you solve this problem.1 solutions Answer 359511 by Alan3354(30983)   on 2011-12-30 21:45:29 (Show Source): You can put this solution on YOUR website!For what numbers x, 0<=x<=2pi does sin x = -1? Can you please show me a step by step instruction on how you solve this problem. ---------- Plot on a unit circle. Hyp = 1 sin = side opp/hyp = y/x --> 3pi/2
 Angles/551073: The supplement of an angle is ten times as large as the complement. Find the original angle1 solutions Answer 359489 by Alan3354(30983)   on 2011-12-30 20:13:22 (Show Source): You can put this solution on YOUR website!The supplement of an angle is ten times as large as the complement. Find the original angle ------- A + 10A = 90 A = 90/11 degs
 Numbers_Word_Problems/551074: The sum of the digits of a certain two digit number is 10. If the number formed by interchanging the digits is subtracted from the original number, the result is 18. What is the original number? Please help me answer this!1 solutions Answer 359486 by Alan3354(30983)   on 2011-12-30 20:08:02 (Show Source): You can put this solution on YOUR website!The sum of the digits of a certain two digit number is 10. If the number formed by interchanging the digits is subtracted from the original number, the result is 18. What is the original number? ------------ Hint: The difference between the 2 digits is 18/9 = 2
 Linear-systems/551163: (1)/(3)y=(1)/(3)x+(5)/(3) x-3y=51 solutions Answer 359485 by Alan3354(30983)   on 2011-12-30 20:06:31 (Show Source): You can put this solution on YOUR website!(1)/(3)y=(1)/(3)x+(5)/(3) x-3y=5 ------------------------------- (1)/(3)y=(1)/(3)x+(5)/(3) Is it (1/3)y or 1/(3y) ? ------ Making 5/3 (5)/(3) doesn't clarify anything.
 Coordinate-system/551167: if (-3,2) is the endpoint OF A LINE segment and (-1,7) is its midpoint what is the other endpoint?1 solutions Answer 359483 by Alan3354(30983)   on 2011-12-30 19:58:47 (Show Source): You can put this solution on YOUR website!if (-3,2) is the endpoint OF A LINE segment and (-1,7) is its midpoint what is the other endpoint? ----------- For x: distance to MP = 2 Add 2 to MP --> x = +1 --------- For y: distance to MP = 5 Add 5 to MP --> y = +12 ---- Other end at (1,12)
 Trigonometry-basics/551172: Find the exact value of tan 19pi/6 using periodic properties thanks1 solutions Answer 359482 by Alan3354(30983)   on 2011-12-30 19:56:22 (Show Source): You can put this solution on YOUR website!Find the exact value of tan 19pi/6 using periodic properties ------- = tan(7pi/6) =
 Travel_Word_Problems/551162: if you are going at the speed of 60 miles per hour and the way to our destination , how many minutes will it take1 solutions Answer 359478 by Alan3354(30983)   on 2011-12-30 19:31:45 (Show Source): You can put this solution on YOUR website!It depends on how far it is.
 Square-cubic-other-roots/551161: Cubic Root to 5/9=1 solutions Answer 359464 by Alan3354(30983)   on 2011-12-30 18:03:06 (Show Source): You can put this solution on YOUR website!Cubic Root to 5/9= -------- Do you mean the cube root of 5/9 ? =
 test/551079: 5 x squared equals 111 solutions Answer 359463 by Alan3354(30983)   on 2011-12-30 18:00:48 (Show Source): You can put this solution on YOUR website! plus or minus
 test/551158: The sum of the digits if a certain two digit number is 6. If the original number is subtracted from the number formed by interchanging the digits, the result is 36. What is the original number? Please help me!!!1 solutions Answer 359461 by Alan3354(30983)   on 2011-12-30 17:50:49 (Show Source): You can put this solution on YOUR website!The sum of the digits if a certain two digit number is 6. If the original number is subtracted from the number formed by interchanging the digits, the result is 36. What is the original number? ---------- The difference when swapping the digits is always 9 times the difference between the digits. --------- So, t + u = 6 t - u = 4 ------ Can you finish it?
 Trigonometry-basics/551070: What Is The Product & Conjugate Of 3-4i1 solutions Answer 359458 by Alan3354(30983)   on 2011-12-30 17:34:37 (Show Source): You can put this solution on YOUR website!What Is The Product & Conjugate Of 3-4i ---------- The conjugate is 3+4i --- The product is 3^2 + 4^2 = 25
 Geometry_Word_Problems/550992: Find the volume of a cube whose edge is 9x-8y.1 solutions Answer 359457 by Alan3354(30983)   on 2011-12-30 17:32:52 (Show Source): You can put this solution on YOUR website!Find the volume of a cube whose edge is 9x-8y. -----------
 Sequences-and-series/551026: 18,20,10,12,4,6,?1 solutions Answer 359455 by Alan3354(30983)   on 2011-12-30 17:30:13 (Show Source): You can put this solution on YOUR website!Do you have a question?
 Surface-area/551150: alex has two congruent cubes A and B. Cube A has a surface area of 540 in2. What the area of one face of cube B?1 solutions Answer 359454 by Alan3354(30983)   on 2011-12-30 17:29:04 (Show Source): You can put this solution on YOUR website!alex has two congruent cubes A and B. Cube A has a surface area of 540 in2. What the area of one face of cube B? ------------ Surface area of a cube with edge length of s = 6s^2 --- sq inch for each cubes
 Exponents/551151: If a = 2i - 2j - k and b = -4i + 3j - 2k a) find the angle between the vectors b) find the vector product.1 solutions Answer 359452 by Alan3354(30983)   on 2011-12-30 17:24:19 (Show Source): You can put this solution on YOUR website!If a = 2i - 2j - k and b = -4i + 3j - 2k a) find the angle between the vectors b) find the vector product. ---------------- a) |a| = sqrt(2^2 + 2^2 + 1) = 3 |b| = sqrt(4^2 + 3^2 + 2^2) = sqrt(29) Dot product = 2*-4 + -2*3 + -1*-2 = -12 a dot b = |a|*|b|*cos(angle) -12 = 3sqrt(29)*cos(A) cos(A) = -12/3sqrt(29) A =~ 137.97 degs ---------------- b) |+i +j +k| |+2 -2 -1| = a X b |-4 +3 -2| = i*(4 + 3) - j*(-4 - 4) + k*(6 - 8) = 7i + 8j + 2k
 test/551133: The value of a certain two digit number is 2 times the sum of it's digits. If the digits are reversed, the resulting number is 4.5 times the original number. What is the original number? Please help me solve this!!1 solutions Answer 359444 by Alan3354(30983)   on 2011-12-30 17:03:00 (Show Source): You can put this solution on YOUR website!The value of a certain two digit number is 2 times the sum of it's digits. If the digits are reversed, the resulting number is 4.5 times the original number. What is the original number? ---------- t = 10s digit u = 1s digit --------- 10t + u = 2*(t+u) 10u + t = 4.5*(10t + u) ---- Can you finish it? -- PS it's = it is
 Polynomials-and-rational-expressions/551140: Factor the expression 36a^2 - 60ab + 25b^2 into a product of binomials.1 solutions Answer 359443 by Alan3354(30983)   on 2011-12-30 17:00:22 (Show Source): You can put this solution on YOUR website!Hint: both ends are squares
 Polynomials-and-rational-expressions/551142: Factor the expression 49x^2 - 42xy + 9y^2 into a product of binomials. 1 solutions Answer 359442 by Alan3354(30983)   on 2011-12-30 16:55:48 (Show Source): You can put this solution on YOUR website!Factor the expression 49x^2 - 42xy + 9y^2 into a product of binomials. --------- Hint: When both ends are perfect squares, try that first.
 Rational-functions/551141: Im taking pre calc as an online class and I'm in way over my head because they do not teach it in a way that I can understand AT ALL. please help, I need to know: If y varies directly as x, and y=7 when x=3 find y when x=7If y varies directly as x, and y=7 when x=3 find y when x=7 I have an idea, SO CONFUSED1 solutions Answer 359438 by Alan3354(30983)   on 2011-12-30 16:48:23 (Show Source): You can put this solution on YOUR website!If y varies directly as x, and y=7 when x=3 find y when x=7 ---------------- y = k*x 7 = k*3 k = 7/3 ----------- when x = 7: y = (7/3)*7 y = 49/3
 Triangles/551128: For a triangle with the sides 18,20,and 27, will the triangle be acute,right,or obtuse? Support your answer wit your work.1 solutions Answer 359426 by Alan3354(30983)   on 2011-12-30 16:13:28 (Show Source): You can put this solution on YOUR website!For a triangle with the sides 18,20,and 27, will the triangle be acute,right,or obtuse? ---------- Compare and (c is the longest side) If they're equal, it's a right triangle. If c^2 is less, it's acute. If c^2 is greater, it's obtuse.
 Exponential-and-logarithmic-functions/551120: This is preliminary for log and exp section. f(x)=5x x y -2 0.04 -1 0.2 0 1 1 5 2 25 3 125 4 625 I can't figure out no matter how I try, how the answers for y are calculated????1 solutions Answer 359422 by Alan3354(30983)   on 2011-12-30 16:01:42 (Show Source): You can put this solution on YOUR website!This is preliminary for log and exp section. f(x)=5x x y -2 0.04 -1 0.2 0 1 1 5 2 25 3 125 4 625 ------------- It's not 5x
 Circles/551037: what is the circumference of a 3600 ml pool1 solutions Answer 359414 by Alan3354(30983)   on 2011-12-30 15:27:34 (Show Source): You can put this solution on YOUR website!What is ml?
 Equations/551013: (sin^2theta+cos^2theta-3)^4=1 solutions Answer 359413 by Alan3354(30983)   on 2011-12-30 15:26:50 (Show Source): You can put this solution on YOUR website!(sin^2theta+cos^2theta-3)^4= -------- Is it cos^2(theta - 3) ? or cos^2(theta) - 3 ? ------------ = = 16