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Recent problems solved by 'richwmiller'

richwmiller answered: 9124 problems
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Evaluation_Word_Problems/456282: solving rational equations and inequalities http://imageshack.us/photo/my-images/96/page48430.jpg/ 1 solutions Answer 313149 by richwmiller(9135)   on 2011-06-01 11:40:43 (Show Source): You can put this solution on YOUR website! You couldn't type that out? You would rather have us load a potentially dangerous image. b=30+c (b+10)/(c+10)=3/2 band has 80 chorale has 50 check 90/60=3/2 80-50=30 ok

Travel_Word_Problems/456093: The speed of a stream is 4 miles per hour. If a boat travels 46 miles downstream in the same amount of time it takes to travel 123 miles upstream, what is the speed of the boat in still water? 1 solutions Answer 313088 by richwmiller(9135)   on 2011-05-31 22:47:53 (Show Source): You can put this solution on YOUR website! r*t=d I think you have up and downstream reversed downstream is with the current but it can't be. (r-4)*t=46 (r+4)*t=123 r = 676/77, t = 77/8 r=8.77922, t=9.625

Mixture_Word_Problems/456088: Bill makes a mixed of dried fruits by mixing dried apples costing $6/kg with dried apricots costing $8/kg. How many kg of each are needed to make a 20 kg mixture worth $7.20/kg? 1 solutions Answer 313080 by richwmiller(9135)   on 2011-05-31 22:37:29 (Show Source): You can put this solution on YOUR website! x+y=20 6x+8y=20*7.2 x=8 y=12 48+96=144

Polynomials-and-rational-expressions/456077: Would the LCD here be 2m? a/m - 3/2m = 15/m 1 solutions Answer 313077 by richwmiller(9135)   on 2011-05-31 22:26:52 (Show Source): You can put this solution on YOUR website! multiply by m a-1.5=15 a=16.5 or multiply by 2m 2a-3=30 2a=33 a=16.5

Complex_Numbers/456079: how do you simplify the equation: (r^2 - r - 6)/ (r^2 -r - 12) also how do you simplify: (-8(4-y))/((y+2)(y-4)) 1 solutions Answer 313076 by richwmiller(9135)   on 2011-05-31 22:10:04 (Show Source): You can put this solution on YOUR website! hints: -(4-y)=y-4 factor r^2-r-6 (r-3)*(r+2) and factor r^2-r-12 (r-4)*(r+3) nothing can be done with the factors

Numeric_Fractions/456069: How do I figure out the value of x in the equation 53 / x = 77.419%? 1 solutions Answer 313075 by richwmiller(9135)   on 2011-05-31 22:02:22 (Show Source): You can put this solution on YOUR website! Can't write such an equation! Try 53 / x = .77419 53 = .77419x x=68.4586

Linear_Equations_And_Systems_Word_Problems/456066: A pet store is selling hamsters for $3.50 each if you purchase a cage for $18.25 you have at most $30 you can spend. how many hamsters can you buy? 1 solutions Answer 313073 by richwmiller(9135)   on 2011-05-31 21:56:19 (Show Source): You can put this solution on YOUR website! 30<=18.25+3.5x max of 3 3*3.5=10.50 10.50+18.25=28.75 4*3.5=14.00 14+18.25=32.25 but you can't afford to pay the tax.

Polynomials-and-rational-expressions/456068: 3/c-4 = c-1/c-4 Please solve that rational equation using cross multiplication and lowest common denominator... I see that c-4 is the common denominator but do you still have to multiply by c-4? 1 solutions Answer 313069 by richwmiller(9135)   on 2011-05-31 21:46:23 (Show Source): You can put this solution on YOUR website! No need to cross multiply. It is like having 3/x=(c-1)/x so 3=c-1 c=4 but c cannot equal 4 since it would make c-4=0 and we can't define division by zero so there is no solution.

Age_Word_Problems/456050: molly is 4 years younger than heidi.in 3 years,heidi will be twice as old as molly.how old are they now ? 1 solutions Answer 313065 by richwmiller(9135)   on 2011-05-31 21:36:35 (Show Source): You can put this solution on YOUR website! m=h-4 h=m+4 h+3=2m h=2m-3 2m-3=m+4 m=7 h=11

Exponents/455973: how do I solve (2x^2 - 3x-5)-(3x^2+x-6) 1 solutions Answer 313063 by richwmiller(9135)   on 2011-05-31 21:32:19 (Show Source): You can put this solution on YOUR website! It is not an equation and so can't be solved. It can be reduced or simplified. (2x^2 - 3x-5)-(3x^2+x-6)= 2x^2 - 3x-5-3x^2-x+6 -x^2-4x+1

Mixture_Word_Problems/455922: Two types of candy sell for $2.50 per pound and $4.00 per pound. How much of each type of candy should be included in order to make a 5 pounds mixture of worth $17.60. 1 solutions Answer 312979 by richwmiller(9135)   on 2011-05-31 16:00:51 (Show Source): You can put this solution on YOUR website! 2.5x+4y=17.60 x+y=5 x=1.6 y=3.4

Equations/455923: Use a radical to write f(x) f (x) =^1/2 help please 1 solutions Answer 312977 by richwmiller(9135)   on 2011-05-31 15:48:42 (Show Source): You can put this solution on YOUR website! ^1/2 means nothing if you want the square root you write sqrt(1/2) or

Polynomials-and-rational-expressions/455911: x^2-9x+7x-63 the directions are to factor completely relative to the integers. Please help me to understand. 1 solutions Answer 312974 by richwmiller(9135)   on 2011-05-31 15:45:14 (Show Source): You can put this solution on YOUR website! x^2-2x-63 x^2-9x+7x-63 x*(x-9)+7*(x-9) (x+7)*(x-9)

Equations/455915: ok, Im in algebra 1 and my biggest difficulties are word problems. I am willing to do the work, please tell me what should i do on a daily basis to speak fluent algebra 1 word problems? or at least translate statements into algebraic statements? 1 solutions Answer 312970 by richwmiller(9135)   on 2011-05-31 15:35:50 (Show Source): You can put this solution on YOUR website! go through the word problems and pay attention to words and phrases such as less than, more than times etc and learn what they mean in algebra

Linear-equations/455914: I have to solve a system of equations using substitution to eliminate one variable for y=2x and 3x+y=20. 1 solutions Answer 312968 by richwmiller(9135)   on 2011-05-31 15:29:56 (Show Source): You can put this solution on YOUR website! plug 2x in for y in the second equation 3x+2x=20 5x=20 x=4 y=2x=8 (4,8)

Equations/455912: what is the cost of 6 composition books at 90 cents each? At c cents each? is this accurate? 90(6)=c? Thanks 1 solutions Answer 312966 by richwmiller(9135)   on 2011-05-31 15:23:45 (Show Source): You can put this solution on YOUR website! No! You have two separate questions the first answer is .90*6=5.40 the second is 6*c

Linear-systems/455901: Can someone please solve using the substitution method? 6x+6y=30 -8x+y=41 1 solutions Answer 312965 by richwmiller(9135)   on 2011-05-31 15:16:36 (Show Source): You can put this solution on YOUR website! divide the first by 6 x+y=5 -8x+y=41 y=5-x -8x+5-x=41 -9x=36 x=-4 x+y=5 -4+y=5 y=9 (-4,9)

Equations/455895: Can you please help me solve the system of equations using the elimination method. 3x + 4y = 4 6x + 8y = 8 1 solutions Answer 312963 by richwmiller(9135)   on 2011-05-31 15:09:18 (Show Source): You can put this solution on YOUR website! They are the same line. The second equation is double the first. All solutions are the same for both equations.

Quadratic_Equations/455887: I need help with this problem The first part of a trip a canoeist travels 59 miles. the canoeist travels 17 miles on the second part of the trip at a speed 5mph slower. The total time for the trip is 4hrs. What was the speed on each part of the trip? Help! Thanks Gina 1 solutions Answer 312961 by richwmiller(9135)   on 2011-05-31 15:03:02 (Show Source): You can put this solution on YOUR website! r*t=d r*x=59 (r-5)*y=17 x+y=4 three equations three unknowns discard negative answers r = 1/2 (24+sqrt(281)), x = -2/5 (sqrt(281)-24), y = 2/5 (sqrt(281)-14) x=2.89478, y=1.10522 r=20.3815 first part r=15.3815 second part

Linear-equations/455888: Solve the system graphically using substitution for y=2x , 2x+y=4 1 solutions Answer 312957 by richwmiller(9135)   on 2011-05-31 14:48:53 (Show Source): You can put this solution on YOUR website! y=2x plug in 2x for y in the second equation and you get 2x+2x=4 4x=4 x=1 y=2x y=2 (1,2)

Triangles/455886: A room has a shape of a right triangle. One of the legs of the triangle is one meter longer than the other. The perimeter of the room is 12 meters. What are the lengths of the three sides? 1 solutions Answer 312956 by richwmiller(9135)   on 2011-05-31 14:43:46 (Show Source): You can put this solution on YOUR website! a+b+c=12 a=b+1 a^2+b^2=c^2 As I suspected, it is a 3,4, 5 right triangle

Functions/455794: Hi thanks for stopping by! Here is my problem: Perform the indicated operation in simplest form. 1/4 + 1/4 1 solutions Answer 312906 by richwmiller(9135)   on 2011-05-31 08:36:45 (Show Source): You can put this solution on YOUR website! I want to help but I get stuck on 1+1=?

Equations/455772: What is a in the equation xa – y + za = 0? 1 solutions Answer 312905 by richwmiller(9135)   on 2011-05-31 08:29:47 (Show Source): You can put this solution on YOUR website! xa-za=y a(x-z)=y a=y/(x-z)

Probability-and-statistics/455782: Distance and Time: A car is traveling at 60 miles per hour. (a) How long does it take the car to travel 360 miles? (b) Write a rational expression that gives the time that it takes the car to travel M miles. 1 solutions Answer 312904 by richwmiller(9135)   on 2011-05-31 08:22:15 (Show Source): You can put this solution on YOUR website! a) over 6 hours since you have to stop to use the restroom. 360/60=6 b) 60t=m

Age_Word_Problems/455538: my moms age in years is the same as my brothers age in months. My mothers age is 6 times my sisters age. My age is the sum of my brother and sisters ages. My fathers age in years is the number of seasons I've been alive. My mother and father are the same age. 1 solutions Answer 312892 by richwmiller(9135)   on 2011-05-31 06:59:07 (Show Source): You can put this solution on YOUR website! m=12b m=6s a=b+s f=4a m=f Not enough info to pin it down to only one answer. in terms of a b = a/3, f = 4a, m = 4a, s = (2a)/3 in terms of b a = 3b, f = 12b, m = 12b, s = 2b If brother is 6 then You are 18 father is 72 mother is 72 sister is 12 If brother is 2 then You are 6 father is 24 mother is 24 sister is 4

Age_Word_Problems/455774: The age of Betty's mother is 7 years more than twice Betty's age. The difference in their ages is 21 years. How old is Betty? Show the linear equation in one variable that you used then show each step in solving for your answer. 1 solutions Answer 312890 by richwmiller(9135)   on 2011-05-31 06:28:15 (Show Source): You can put this solution on YOUR website! m=2b+7 m-b=21 m=b+21 2b+7=b+21 2b=b+14 b=14 m=35 check 35=2*14+7 35=28+7 35=35 ok

Number-Line/455777: Where should I place -1.7 on the real number line? I know the general idea of where it should be (.7 to the left of -1), but there are no exact lines on the graph to place it exactly in that place. Should I estimate as to where it should go? Thanks. 1 solutions Answer 312889 by richwmiller(9135)   on 2011-05-31 06:23:09 (Show Source): You can put this solution on YOUR website! yes

Percentage-and-ratio-word-problems/455779: a bucket when a quarter full holds 3.5 liters. How many liters will it hold when three quarters full ? thank you please reply quickly it is for my revision thanks 1 solutions Answer 312888 by richwmiller(9135)   on 2011-05-31 06:19:50 (Show Source): You can put this solution on YOUR website! 10.5 3.5*3=10.5

Coordinate-system/455662: Snookers Lumber can convert logs into either lumber or plywood. In a given day the mill turns out twice as many units of plywood than lumber. It makes a profit of $30 on a unit of lumber and $45 on a unit of plywood. How many of each unti must be produced and sold in order to make a profit of $12,240? 1 solutions Answer 312861 by richwmiller(9135)   on 2011-05-30 22:20:10 (Show Source): You can put this solution on YOUR website! p=2l 30l+45p=12240 p=204 l=102

Quadratic_Equations/455619: i need help with these two quadratic equations, please(: 3(x-4)squared=18 and the other one.. 4(x+9)squared=24 if anyone doesnt mind helping me out it would be so awesome!! Thanks! 1 solutions Answer 312787 by richwmiller(9135)   on 2011-05-30 18:01:01 (Show Source): You can put this solution on YOUR website! 3(x-4)^2=18 (x-4)^2=6 4(x+9)^2=24 divide by 4 (x+9)^2=6

Probability-and-statistics/455618: Ed made a list of all the two-digit numbers that can be formed using two different digits from 1,3,5,7,9 what are all the possible outcomes 1 solutions Answer 312784 by richwmiller(9135)   on 2011-05-30 17:55:37 (Show Source): You can put this solution on YOUR website! 5*4 Ask Ed he made the list of 20 possible outcomes.