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# Recent problems solved by 'JBarnum'

JBarnum answered: 2042 problems
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 Rational-functions/318853: solve: 3/5 + 2 / x - 1 = 4 / 5x - 5 a) 5 / 3 b) - 5 / 3 c) 1 d) -11 solutions Answer 228234 by JBarnum(2044)   on 2010-06-30 15:18:49 (Show Source): You can put this solution on YOUR website!factor what u can common denominator is 5(x-1) multiply the 1's to the problem add numerators factor multiply each side by denominator divide by 3 subtract 1
 Complex_Numbers/318654: One half of the sum of three consecutive multiples of 10 is 90. What are the multiples of 10?1 solutions Answer 228098 by JBarnum(2044)   on 2010-06-29 19:24:24 (Show Source): You can put this solution on YOUR website! 50,60,70 50+60+70=180/2=90 multiples of 10 are 10, 20, 30, 40, 50, 60, 70, 80, 90, 100....
 Average/318655: what is the average grade for scores of 68,70 and a 78 1 solutions Answer 228096 by JBarnum(2044)   on 2010-06-29 19:05:40 (Show Source): You can put this solution on YOUR website! A=average 216/3=72
 Sequences-and-series/318658: a number whose product with 6 is the same as its sum with 60?1 solutions Answer 228095 by JBarnum(2044)   on 2010-06-29 19:02:58 (Show Source): You can put this solution on YOUR website!6n=n+60 subtract n 5n=60 divide by 5
 Radicals/318549: Hello can you please help me solve this problem? Use the laws of exponents 9/10 2/11 (7 )1 solutions Answer 228073 by JBarnum(2044)   on 2010-06-29 16:38:04 (Show Source): You can put this solution on YOUR website!um i dont even see a problem just 3 numbers
 Square-cubic-other-roots/318551: Can yhou please walk me through this? 4 = 5 + sqrt(2 x + 59) x = ? Is this solution extraneous? Yes or No Jerry jerry@san.rr.com1 solutions Answer 228060 by JBarnum(2044)   on 2010-06-29 15:45:07 (Show Source): You can put this solution on YOUR website! subtract 5 square both sides subtract 59 divide by 2 checking or this one doesnt work 4=6 correct
 Money_Word_Problems/318590: On Friday, Niles sold \$3.25 more than twice what she sold on Thursday. She sold \$20.25 Friday. How much did she sell Thursday? 1 solutions Answer 228058 by JBarnum(2044)   on 2010-06-29 15:41:05 (Show Source): You can put this solution on YOUR website! \$8.50 sold on thursday
 Linear-equations/318599: i am not understanding how to find an equation of a line that has a slope of -8 and passes through (-1,5). Write in slope intercept form1 solutions Answer 228056 by JBarnum(2044)   on 2010-06-29 15:35:50 (Show Source): You can put this solution on YOUR website!slope intercept form is where m=slope and b= intercept you have the following: substitute the letters for the numbers and solve for "b" multiply -8 and -1 subtract 8 rewrite equation
 Geometry_Word_Problems/318594: The perimeter of a rectangle is 92 if the widths were doubled and the lengths increased by 12 the new perimeter would be 140. What are the length and width of the rectangle?1 solutions Answer 228052 by JBarnum(2044)   on 2010-06-29 15:28:46 (Show Source): You can put this solution on YOUR website!p=92 p=2(L+W) = = = i will use the subtraction property of elimination method Checking correct
 Polynomials-and-rational-expressions/318138: I've been stuck on this problem for a while. What is the solution to: (6x^2-24) / (6x^2-12)1 solutions Answer 228047 by JBarnum(2044)   on 2010-06-29 15:18:38 (Show Source): You can put this solution on YOUR website!im guessing ur simplifying it i dont see how u can solve for x so start by factoring out a 6 in numerator and denominator 6's cancel and can factor numerator denominator has fractional factors so i left it in this form
 Polynomials-and-rational-expressions/318533: Will someone please help me solved this problem? v^2-9u^21 solutions Answer 228045 by JBarnum(2044)   on 2010-06-29 15:11:12 (Show Source): You can put this solution on YOUR website!this is a perfect square. the more of these you do the more u will start recognizing them the factor for this is simple, when its a minus sign in the middle theres a + and - in the factors check by foiling correct
 Divisibility_and_Prime_Numbers/318589: Factor completely. If prime, say so. a. 40x^3-64x^2y b. 125r^3-8s^3 1 solutions Answer 228042 by JBarnum(2044)   on 2010-06-29 14:59:47 (Show Source): You can put this solution on YOUR website!i start with the variables first then factor a 4 out then factor out the 2 i see the cube but i dont think i can factor it correctly be something like but this doesnt seem to come out right when foiled
Equations/318139: 12x2 + 23x + 10 = 0
A. 5/4, 2/3 B. -5/12, -1/5 C. -5/4, -2/3 D. 5/4, -2/3
1 solutions

Answer 228039 by JBarnum(2044)   on 2010-06-29 14:55:46 (Show Source):
You can put this solution on YOUR website!
use quadratic formula
(-0.666666666666667, -1.25)
or (, )
 Solved by pluggable solver: SOLVE quadratic equation with variable Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=49 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: -0.666666666666667, -1.25. Here's your graph:

 Graphs/318234: Graph: y = 3x - 1 1 solutions Answer 228038 by JBarnum(2044)   on 2010-06-29 14:51:05 (Show Source): You can put this solution on YOUR website!y-intercept is -1 y=3x-1 if y=0 then 0=3x-1 1=3x 1/3=x this is x intercept so plot either (,)(,) or (,)(,) the second one shows first point at y-intercept and then uses slope going up 3 and to the right 1 draw your line your graph is made
 Graphs/318231: Is (0, 0) a solution of -3x - 5y = -1? 1 solutions Answer 228035 by JBarnum(2044)   on 2010-06-29 14:44:49 (Show Source): You can put this solution on YOUR website!no, plug in 0 for x and 0 for y u get 0-0=-1
 Square-cubic-other-roots/318325: SQUARE ROOT OF W+16=31 solutions Answer 228034 by JBarnum(2044)   on 2010-06-29 14:41:13 (Show Source): You can put this solution on YOUR website!square each side subtract 16
 test/318174: deleted1 solutions Answer 228032 by JBarnum(2044)   on 2010-06-29 14:37:12 (Show Source): You can put this solution on YOUR website!dont waste our time and space.
 Rational-functions/318578: Divide: (4m + 16) / (10) / (3m + 12) / (18) a) 12 / 5 b) (m + 4)^2 / 15 c) 15 / (m + 4)^2 d) 5 /121 solutions Answer 228027 by JBarnum(2044)   on 2010-06-29 14:30:30 (Show Source): You can put this solution on YOUR website! seperate into a fraction divided by a fraction use the multiply by reciprical property factor out the 3 and the 4 factor the numbers to see whats incommon i multiplied them to show you what i will be canceling shows cancelation this is all thats left over
 Equations/318572: The sum of two numbers is 33. Twice the first number minus the seconed number equals 18. Find both numbers.1 solutions Answer 228018 by JBarnum(2044)   on 2010-06-29 14:18:10 (Show Source): You can put this solution on YOUR website! im using the addition property in elimination method
 Expressions-with-variables/318575: The width of a rectangle is fixed at 22 cm. What lengths will make the perimeter greater than 86 cm? The length must be greater than? 1 solutions Answer 228016 by JBarnum(2044)   on 2010-06-29 14:12:16 (Show Source): You can put this solution on YOUR website!p=2(L+W) P=86 W=22 find L 86=2(L+22) 43=L+22 21=L so for the perimeter to be greater then 86 L must be greater then 21
 Miscellaneous_Word_Problems/318563: What is the length and width of a room that is 185 square feet?1 solutions Answer 228012 by JBarnum(2044)   on 2010-06-29 14:06:45 (Show Source): You can put this solution on YOUR website!is the room rectangle or square...ibelieve theres not enough information to solve properly or you are left with many solutions. for example L=1 W=185 rectangle L=2 W=92.5 rectangle L=3 W=61(2/3) rectangle L=4 W=46.25 rectangle L=13.604 W=13.604 square .... you can see what i mean. without more information there are many answers.
 Rectangles/318557: If the length of a rectangle were decreased by twenty-seven feet the rectangle would be a square. The perimeter of the rectangle is two hundred ninety-four feet. What are the dimensions of the rectangle?1 solutions Answer 228005 by JBarnum(2044)   on 2010-06-29 13:43:20 (Show Source): You can put this solution on YOUR website! because if the length is decreased by 27 on both sides then all sides would be equal making a square P=294 add like terms distribute the 2 add 54 divide by 4
 Equations/318308: Using the multiplication principle solve; -6x>1/13 1 solutions Answer 227811 by JBarnum(2044)   on 2010-06-28 14:37:58 (Show Source): You can put this solution on YOUR website! multiply by 13 divide by -78
 Angles/318319: Find the complementary angle to 83 digrees1 solutions Answer 227810 by JBarnum(2044)   on 2010-06-28 14:34:42 (Show Source): You can put this solution on YOUR website!complementary angles are 2 angles that add to 90 degrees 7 degrees
 Rational-functions/318311: Which of the following is equivalent to the rational number [3x / 4x]? a) 6x / 8x b) 12x / 24x c) 48x / 56x d) 3x / 5x1 solutions Answer 227809 by JBarnum(2044)   on 2010-06-28 14:33:03 (Show Source): You can put this solution on YOUR website!all u need to do is find out what number was multiplied to both 3 and 4 that equals one of the answers. looking at a) 3*2=6 and 4*2=8 so
 Polynomials-and-rational-expressions/317506: The length of a metal bar is 7x-5. If one part of the metal bar has the length of x-2. Find the length of the other part1 solutions Answer 227360 by JBarnum(2044)   on 2010-06-25 13:01:04 (Show Source):
 Equations/317497: Solve each system by addition. x + y = 7 x – y = 9 1 solutions Answer 227359 by JBarnum(2044)   on 2010-06-25 12:55:36 (Show Source): You can put this solution on YOUR website!add them together 2x+0=16 divide by 2 x=8 can also subtract them 2y=-2 y=-1
 Average/317489: The average of 5/6 and 7/12 minus the average of 2/3 and 3/4 is equal to A)1/24 B)0 C)-1/12 D)1 E)1/241 solutions Answer 227351 by JBarnum(2044)   on 2010-06-25 12:23:22 (Show Source): You can put this solution on YOUR website! FIND LCDs
 Probability-and-statistics/317479: Find the variance of the binomial distribution with the given values. n = 50 p = 0.9 1 solutions Answer 227350 by JBarnum(2044)   on 2010-06-25 12:13:50 (Show Source): You can put this solution on YOUR website! where is the binomial distribution? there are no equations. n=50 and p=.9 means nothing without some kind of equation. might aswell say z=459 and Q=.2345
 Money_Word_Problems/317343: You are buying a new car. You have \$10,000 from Savings and \$12,000 from a car loan. What integer would represent your total budget for buying a new car? I realize the answer to that is 22,000 but the next question I'm stuck: Using your answer from 1: You will use 15% of your budget to pay for tax and title fees. Write an algebraic expression (meaning you DO NOT SOLVE) showing how much of your budget you will be spending on the cost of the car. 1 solutions Answer 227349 by JBarnum(2044)   on 2010-06-25 12:07:09 (Show Source): You can put this solution on YOUR website! T=tax and fees so this is your equation where C=money spent on car
 Numbers_Word_Problems/317466: y is 2.5 when x is 5, and y varies directly with x. Find y when x is 10. 5 7.5 12.5 20 1 solutions Answer 227348 by JBarnum(2044)   on 2010-06-25 12:02:47 (Show Source): You can put this solution on YOUR website!2.5=(1/2)5 y=(1/2)10 y=5