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# Recent problems solved by 'Alan3354'

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 Numeric_Fractions/352461: Can you help me find the slope for: y = -3x + 9 Not sure where to begin with this. Thank yhou.1 solutions Answer 251866 by Alan3354(31518)   on 2010-10-05 22:15:31 (Show Source): You can put this solution on YOUR website!m = -3
 Permutations/352450: The music class has 20 students & the teacher wants them to practice in groups of 5. How many different ways can the first groups of 5 be chosen? we are doing permutations & combinations. I came up with 1,860,480 or 38,760. im not sure which one is the right answer if any.1 solutions Answer 251860 by Alan3354(31518)   on 2010-10-05 21:50:49 (Show Source): You can put this solution on YOUR website!The music class has 20 students & the teacher wants them to practice in groups of 5. How many different ways can the first groups of 5 be chosen? we are doing permutations & combinations. I came up with 1,860,480 or 38,760. im not sure which one is the right answer if any. ----------------------- 20*19*18*17*16 = 1860480 But group ABCDE is the same as ADCEB, so you have to divide by 5! = 120 --> 15504
 Exponential-and-logarithmic-functions/352439: Find an equation of the tangent line at the point indicated. f (x) = log3 (8x + x^-8), x = 1? 1 solutions Answer 251859 by Alan3354(31518)   on 2010-10-05 21:41:27 (Show Source): You can put this solution on YOUR website! f (x) = f(x) = (1/ln(3))*ln(8x + x^-8) f'(x) = (1/ln(3))*(1/(8x + x^-8))*(8 - 8x^-9) @ x = 1: f'(x) = (1/ln(3))*(1/(8 + 1))*(8 - 8) = 0 --------- f(1) = log(3,9) = 2 --> y = 2 is the line tangent at x = 1
 Divisibility_and_Prime_Numbers/352441: what is the divible of 421 solutions Answer 251856 by Alan3354(31518)   on 2010-10-05 21:39:59 (Show Source): You can put this solution on YOUR website!I don't know what that means.
 Volume/352437: R^2 * Pi * H / 1728 = Volume (cu ft). if R is 8 what is the answer?1 solutions Answer 251854 by Alan3354(31518)   on 2010-10-05 21:37:02 (Show Source): You can put this solution on YOUR website!What is the question?
 Permutations/352428: How many possibilities are there for a jumble with 6 letter? I tried this by doing 6x5x4x3x2x1=720 Did I do this right?1 solutions Answer 251850 by Alan3354(31518)   on 2010-10-05 21:32:52 (Show Source): You can put this solution on YOUR website!That's right. It's 6! or 6 factorial.
 Expressions-with-variables/352438: I need the answer to this question.. ASAP!! its like for tommorow morning.. T=2*U/B+E....... SOLVE FOR B... In other terms this says T equals 2 times U over B + E Please and thanks for right answer!1 solutions Answer 251847 by Alan3354(31518)   on 2010-10-05 21:31:19 (Show Source): You can put this solution on YOUR website!T=2*U/B+E....... SOLVE FOR B ---------- Is the denominator B? or B+E ?
 Exponents-negative-and-fractional/352365: Please help me solve this equation: 4x squared to the negative second power. (4x^2)^-2. I came up with 1/16x to the negative fourth power then simplified to 1/16x to the fourth power. Is this correct? 1 solutions Answer 251845 by Alan3354(31518)   on 2010-10-05 21:29:56 (Show Source): You can put this solution on YOUR website!(4x^2)^-2. = That's what it is.
 Finance/352278: how to calculate the average spped of 520kmin8hours and ouestion 2 how to calculate the average speed of 255minutes in 15 sec1 solutions Answer 251823 by Alan3354(31518)   on 2010-10-05 19:35:26 (Show Source): You can put this solution on YOUR website!how to calculate the average spped of 520kmin8hours You have only 2 numbers, what are the possibilities? 520/8 = 65 km/hr -------------- and ouestion 2 how to calculate the average speed of 255minutes in 15 sec I don't know what that means.
 Angles/352287: which three points in the figure are colliner1 solutions Answer 251794 by Alan3354(31518)   on 2010-10-05 17:47:50 (Show Source): You can put this solution on YOUR website!No figure is shown.
 Equations/352162: what is 1 times a number is 10 less than 2 times the number1 solutions Answer 251663 by Alan3354(31518)   on 2010-10-05 13:29:12 (Show Source): You can put this solution on YOUR website!It's a math problem.
 test/352178: Solve 4x+4(2x-1)=201 solutions Answer 251656 by Alan3354(31518)   on 2010-10-05 13:15:06 (Show Source): You can put this solution on YOUR website!4x+4(2x-1)=20 Divide by 4 x + (2x-1) = 5 3x-1 = 5 Add 1 3x = 6 x = 2
 decimal-numbers/352143: How do I convert to decimal notation? 8.01x10^71 solutions Answer 251633 by Alan3354(31518)   on 2010-10-05 12:07:08 (Show Source): You can put this solution on YOUR website!Start with 8.01 and move the decimal point 7 places to the right. Add zeroes as needed. 8.010000000
 Points-lines-and-rays/352129: Give the equation of the line that goes through the point (0,5) and is parallel to the y-axis.1 solutions Answer 251626 by Alan3354(31518)   on 2010-10-05 11:19:51 (Show Source): You can put this solution on YOUR website!That is the y-axis x = 0
 Distributive-associative-commutative-properties/352095: 2 x 56 x 51 solutions Answer 251569 by Alan3354(31518)   on 2010-10-05 08:49:31 (Show Source): You can put this solution on YOUR website!= 560 ------ Use the asterisk for multiply 2*56*5 = 560
 Triangles/352101: Triangle ACD is an isosceles triangle, and segment AC has a slope of 2/3. What is the length in feet of segment AD? 1 solutions Answer 251567 by Alan3354(31518)   on 2010-10-05 08:47:04 (Show Source): You can put this solution on YOUR website!Not enough info.
 Linear-equations/352102: which of the ordered pairs is the best estimate of the solution of the system y=-2x-1 and y=x-31 solutions Answer 251562 by Alan3354(31518)   on 2010-10-05 08:30:40 (Show Source): You can put this solution on YOUR website!y=-2x-1 and y=x-3 -2x-1 = x-3 3x = 2 x = 2/3 y = -7/3 ---------- It's not an estimate.
 Linear-equations/352013: According to Newton's Law of Universal Gravitation, the gravitational force F between two masses m1 and m2 separated by a distance s is . The quantity G is called the gravitational constant. Solve for F= G m1 m2/S^2 solve for g 1 solutions Answer 251486 by Alan3354(31518)   on 2010-10-04 23:15:41 (Show Source): You can put this solution on YOUR website!F= G m1 m2/S^2 solve for g F*s^2 = G*m1*m2 G = m1*m2/(F*s^2)
 logarithm/352030: ( log n - 1 ) ( log n - 2 ) = ? where log base is 4.1 solutions Answer 251485 by Alan3354(31518)   on 2010-10-04 23:13:59 (Show Source): You can put this solution on YOUR website!Is it log(n) -1 ? or log(n-1) ?
 Graphs/352022: how to sketch the graph of the line 3x+2y=61 solutions Answer 251484 by Alan3354(31518)   on 2010-10-04 23:13:04 (Show Source): You can put this solution on YOUR website!It's a straight line, so you need 2 points. Pick two values for x and find y. Plot the 2 points. Draw a line thru them.
 Matrices-and-determiminant/351892: how do you solve matrices? 1 solutions Answer 251451 by Alan3354(31518)   on 2010-10-04 20:42:12 (Show Source): You can put this solution on YOUR website!I use an Excel sheet I made.
 Travel_Word_Problems/351951: two crews are digging an 8-meter tunnel through marble mountain. crew A starts at the west end and digs at a rate of 9m/day. Five days later, crew B starts at the east end and digs at a rate of 10m/day. how many days will crew A have been working when the tunnel is finished? (round to the nearest day.)1 solutions Answer 251448 by Alan3354(31518)   on 2010-10-04 20:39:31 (Show Source): You can put this solution on YOUR website!two crews are digging an 8-meter tunnel through marble mountain. crew A starts at the west end and digs at a rate of 9m/day. Five days later, crew B starts at the east end and digs at a rate of 10m/day. how many days will crew A have been working when the tunnel is finished? (round to the nearest day.) --------------- 8/(9+10) =~ 0.421 days To the nearest day, = zero (0).
 Graphs/351945: (-2,-5) (2,7) 1 solutions Answer 251447 by Alan3354(31518)   on 2010-10-04 20:37:43 (Show Source): You can put this solution on YOUR website!Do you have a question?
 Radicals/351836: what is seventh root of x raised to the seventh power is x. 1 solutions Answer 251407 by Alan3354(31518)   on 2010-10-04 18:15:25 (Show Source): You can put this solution on YOUR website!= x
 Linear-equations/351842: what is the equation of the line? M=2; P=(0,1)1 solutions Answer 251405 by Alan3354(31518)   on 2010-10-04 18:14:25 (Show Source): You can put this solution on YOUR website!Use y = mx + b m = 2 b = 1
 Functions/351838: f (10) (10)+6+3 - all under square root. the answer I got was 19 square root. but the book says the answer is 7. help please.1 solutions Answer 251404 by Alan3354(31518)   on 2010-10-04 18:13:17 (Show Source): You can put this solution on YOUR website!Something's missing. You show f(10), but there's no function given.
 Linear-equations/351732: a line passes through a point (4,-2) and is parallel to the line containing (-1,4) and (2,-3), what is the standard form?1 solutions Answer 251378 by Alan3354(31518)   on 2010-10-04 16:39:57 (Show Source): You can put this solution on YOUR website!---------------------- 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 + 12 The slope, m = -3 ------------------ The slope of lines parallel is the same. 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, or at Moral Loophole@aol.com
 Polynomials-and-rational-expressions/351779: Says to find the length of the unknown side of the triangle. Give the exact length and a one decimal place approximation. One side is 4m Second side is 3 sqrt (7m)1 solutions Answer 251375 by Alan3354(31518)   on 2010-10-04 16:38:11 (Show Source): You can put this solution on YOUR website!That's not enough info. You need 3 elements to solve a triangle, and at least 1 has to be a side.
 Equations/351738: Write down the equations of the line described in the following questions: #47 The line passes through the points (8,2) and (4,-7) #48 The line passes through the point (4,4) and has a slope of -4 #49 The line has a y-intercept of 5 and a slope of 3 #50 The line has a X-intercept of 5 and a slope of 31 solutions Answer 251373 by Alan3354(31518)   on 2010-10-04 16:36:56 (Show Source): You can put this solution on YOUR website!Do them like these: Given 2 points example. Find the equation of the line thru the points (2,1) and (3,5) --------------------- This is a 2 step process. First find the slope of the line thru the points. slope, m = diffy/diffx m = (5-1)/(3-2) m = 4 --------- Now use y = mx + b with either point to find b, the y-intercept. y = mx + b 5 = 4*3 + b b = -7 ------- y = mx + b y = 4x - 7 is the answer. ------------------------ Another approach using determinants: |x y 1| |2 1 1| = 0 |3 5 1| -------- x(1-5) - y(2-3) + 1(10-3) = 0 -4x + y + 7 = 0 y = 4x - 7 --------- For further assistance, or to check your work, email me via the thank you note or at Moral Loophole@aol.com ---------------------- 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 + 12 The slope, m = -3 ------------------ The slope of lines parallel is the same. 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, or at Moral Loophole@aol.com
 Polynomials-and-rational-expressions/351772: 12x^2-32x+5 It says to find two numbers whose product is 12 x 5 = 60 whose sum is -32.1 solutions Answer 251368 by Alan3354(31518)   on 2010-10-04 16:25:14 (Show Source): You can put this solution on YOUR website!-30 and -2
 Numbers_Word_Problems/351679: The product of two positive consecutive even integers is 224. find the integers.1 solutions Answer 251338 by Alan3354(31518)   on 2010-10-04 15:02:43 (Show Source): You can put this solution on YOUR website!sqrt(224) =~ 15, the center --> 14 & 16