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Recent problems solved by 'richwmiller'

richwmiller answered: 9124 problems
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Quadratic_Equations/594724: What are the roots of the equation y=x^2+6x+8? 1 solutions Answer 376877 by richwmiller(9135)   on 2012-04-03 08:17:19 (Show Source): You can put this solution on YOUR website! what are the factors of 8 which add up to 6 4*2=8 4*2=6 (x+4)*(x+2)=0 x=-2, x=-4

Rate-of-work-word-problems/594710: Mr. Samson can sort the bins in 12 days. If Joe helps him, it only takes 4 days. How long would it take for Joe to sort the bins himself? 1 solutions Answer 376876 by richwmiller(9135)   on 2012-04-03 08:11:55 (Show Source): You can put this solution on YOUR website! 4/12+4/x=1 1/3+4/x=1 4/x=2/3 x=6 days

Linear-systems/594723: Substitute the known information from the problem into the perimeter formula . Simplify where necessary. Then, solve the equation for the unknown variable. Be sure to show all the steps. 1 solutions Answer 376875 by richwmiller(9135)   on 2012-04-03 08:08:53 (Show Source): You can put this solution on YOUR website! ok. will do

Equations/594714: An express train takes 5 1/2 hours to travel between two cities. If the express train only takes 3/5 of the time an ordinary train takes, how long will it take for the ordinary train to travel between the two towns? I need to to show all workings and how I formulated the equation to solve the problem. 1 solutions Answer 376873 by richwmiller(9135)   on 2012-04-03 08:07:01 (Show Source): You can put this solution on YOUR website! Let x= express train time Let o=ordinary train time x=3/5*o=.6o x=5.5 3/5o=5 1/2 6/10o=55/10 6o=55 o=55/6

test/594507: I need help on 9 th grade algebra math. My question is how to simplify 5^-2\p 1 solutions Answer 376799 by richwmiller(9135)   on 2012-04-02 19:17:38 (Show Source): You can put this solution on YOUR website! 1/25p

Travel_Word_Problems/594555: some bank robbers rob a bank in madison and flee for S.Beloit at 90 miles an hour (1.5 miles/min) they get a 10 mile head start over the police chasing them at 120 miles an hour down the same highway. when and where will the police catch them? 1 solutions Answer 376796 by richwmiller(9135)   on 2012-04-02 19:14:38 (Show Source): You can put this solution on YOUR website! They are about 50 miles apart. 90x+10=120x 10=30x 1/3=x x = 20 minutes

Percentage-and-ratio-word-problems/594537: The ratio of two positive numbers are 3 to 2 . If the difference between the numbers are 15 what are the numbers? 1 solutions Answer 376790 by richwmiller(9135)   on 2012-04-02 19:08:41 (Show Source): You can put this solution on YOUR website! x/y=3/2 x-y=15 x=45 y=30

Probability-and-statistics/594546: Tom buys some packs of crayons for the class. The crayons come in packs of 5. How many crayons does Tom buy? 1 solutions Answer 376782 by richwmiller(9135)   on 2012-04-02 19:02:40 (Show Source): You can put this solution on YOUR website! Whose class?

Word_Problems_With_Coins/594544: Marty has dimes and nickels in his pocket. He has 2 times as many buckles as dimes. How many dimes and nickels are there if he has $3.20 in his pocket?. 1 solutions Answer 376780 by richwmiller(9135)   on 2012-04-02 19:01:00 (Show Source): You can put this solution on YOUR website! How much are buckles worth?

Mixture_Word_Problems/594542: A scientist mixes 200 mL of a solution that is 4% salt by weight with 300 mL of a solution that is 8% salt by weight. What percent salt is the resulting solution? 1 solutions Answer 376778 by richwmiller(9135)   on 2012-04-02 18:58:40 (Show Source): You can put this solution on YOUR website! .04*200+.08*300=500*x x=.064=6.4%

Systems-of-equations/594495: Please help me solve this equation by factoring . 1 solutions Answer 376755 by richwmiller(9135)   on 2012-04-02 17:04:24 (Show Source): You can put this solution on YOUR website! x^2-18x/7+11/7=0 (x-7/7)*(x-11/7)=0 x=1 x=11/7

Volume/594491: If a 16 ft pipe with a radius of 1 ft leaked for 2 hrs at 10ml per minute. How many gallons leaked out of the pipe? 1 solutions Answer 376750 by richwmiller(9135)   on 2012-04-02 16:51:56 (Show Source): You can put this solution on YOUR website! 10*60*2= 1200 ml

Geometry_Word_Problems/594469: The perimeter of an equilateral triangle, triangle RST is 72 inches. What is the length of an altitude of triangle RST A. 24 inches B. 12 radical 3 inches C. 12 radical 2 inches D. 12 inches 1 solutions Answer 376749 by richwmiller(9135)   on 2012-04-02 16:49:21 (Show Source): You can put this solution on YOUR website! 9*8=72 3*24=72 each side is 24 the base is 12 12^2+b^2=24^2 b=12sqrt(3) which is choice B)

Linear_Equations_And_Systems_Word_Problems/594490: a catering company is setting up tables for an event that will host 764 people. when they set up the tables they need 2 forks for each child and 5 forks for each adult. if the company ordered 2992 forks, how many adults and how many children will be attending the event? 1 solutions Answer 376747 by richwmiller(9135)   on 2012-04-02 16:43:23 (Show Source): You can put this solution on YOUR website! 2c+5a=2992; c+a=764 a=488 c=276

Quadratic_Equations/594480: This is a quadratic equation that I must solve. 15x-35y+90 I need all of the steps so I can understand it better for the next equation. 1 solutions Answer 376745 by richwmiller(9135)   on 2012-04-02 16:40:40 (Show Source): You can put this solution on YOUR website! This is not an equation. Do you see an equal sign? It is not quadratic. There is nothing squared.

Travel_Word_Problems/593580: Two cars leave towns 510 kilometers apart at the same time and travel toward each other. One car's rate is 14 kilometers per hour less than the other's. If they meet in 3 hours, what is the rate of the slower car? 1 solutions Answer 376373 by richwmiller(9135)   on 2012-03-30 10:55:05 (Show Source): You can put this solution on YOUR website! R*T=D 3*r+3*(r+14)=510 3*(2r+14)=510 6r+42=510 r=78 kmh

Polynomials-and-rational-expressions/593610: Can someone help me on this...I have done it and came out with three different answers 7^-3*7^-9 1 solutions Answer 376372 by richwmiller(9135)   on 2012-03-30 10:45:30 (Show Source): You can put this solution on YOUR website! What have you tried?

Functions/593613: Im so having trouble with functions questions. Could you help! a. The function f(t)=100t+300 models the cost to rent and operate a bull dozer for t hours in a day. As you read this function, the sotry that it is telling you that its costs __________dollars to rent this bulldozer even it is not used this day. When it is used, each hour of usage costs an additional_____dollars. I really need some help. I have many more questions like this. If can only get the just of this, maybe I will be able to figure out the rest. I'm probably making this harder than it is. Thank you for you help! 1 solutions Answer 376370 by richwmiller(9135)   on 2012-03-30 10:39:39 (Show Source): You can put this solution on YOUR website! a. 300 dollars a day to rent the bulldozer plus 100 dollars an hour to operate it.

test/593612: I need a tutor I suck at math 1 solutions Answer 376369 by richwmiller(9135)   on 2012-03-30 10:36:08 (Show Source): You can put this solution on YOUR website! Your English is also subpar.

Quadratic_Equations/593599: Find the roots of 2x^2-5x+1=0. Thank you so much, everybody! I really appreciate this! 1 solutions Answer 376368 by richwmiller(9135)   on 2012-03-30 10:31:21 (Show Source): You can put this solution on YOUR website! Use the quadratic formula.

Complex_Numbers/593447: How does (8-3i)+(2+3i)= 53? 1 solutions Answer 376336 by richwmiller(9135)   on 2012-03-29 21:47:48 (Show Source): You can put this solution on YOUR website! It doesn't. (8-3i)+(2+3i)= 10

Square-cubic-other-roots/593421: i need a step by step on how to do this equation: 64x^2-16x+1 1 solutions Answer 376334 by richwmiller(9135)   on 2012-03-29 21:44:19 (Show Source): You can put this solution on YOUR website! It isn't an equation. Do you see an equal sign? It can be factored. (1-8x)^2

Mixture_Word_Problems/593228: Please help me solve this: How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that is 80% copper in order to get an alloy that is 20% copper? 1 solutions Answer 376249 by richwmiller(9135)   on 2012-03-29 14:09:54 (Show Source): You can put this solution on YOUR website! .8*500+.1x=.2*(500+x)

Linear-systems/593141: How do you solve the linear in equality 4x-9-8x >=-7x-11+5x? 1 solutions Answer 376208 by richwmiller(9135)   on 2012-03-29 09:20:07 (Show Source): You can put this solution on YOUR website! x<=1

test/593129: In a camp, 95 men had provisions for 200 days. After 5 days, 30 men left the camp. For how many days will the remaining food last now? 1 solutions Answer 376207 by richwmiller(9135)   on 2012-03-29 09:14:22 (Show Source): You can put this solution on YOUR website! 195*95/65=285 days

Linear-equations/593140: if the line through the points (6,r) and (-2,1) is perpendicular to the line y=-2-3, what is the value of r? 1 solutions Answer 376206 by richwmiller(9135)   on 2012-03-29 09:05:46 (Show Source): You can put this solution on YOUR website! check your equation for the line.

Human-and-algebraic-language/592759: A restaurant has fixed costs of $137.50 per day and an average unit cost of $4.75 for each meal served. If a typical meal sells for $6.00 how many meals must the restaurant serve per day to make a profit? 1 solutions Answer 376038 by richwmiller(9135)   on 2012-03-28 13:18:41 (Show Source): You can put this solution on YOUR website! 137.50=1.25x 110 meals to break even

test/592760: determine whether the given value is a solution of the equation. x^2-2x+15= 1 solutions Answer 376037 by richwmiller(9135)   on 2012-03-28 13:17:00 (Show Source): You can put this solution on YOUR website! either yes or no

Human-and-algebraic-language/592762: An empty truck with driver weights 4350 pounds. It is loaded with feed corn weighing 31 pounds per bushel. Between the farm and the market is a bridge with a 10000 pound weight limit. How many bushels can the truck legally carry? 1 solutions Answer 376036 by richwmiller(9135)   on 2012-03-28 13:16:25 (Show Source): You can put this solution on YOUR website! 4350+31x=10000 182 is the maximum number of bushels to stay under 10000

Age_Word_Problems/592761: Using the number 32 and 13. At some point during the lives of you and the youngest person, your age will be three times his/her age at that moment. Write an equation which models how old in years each of you will be when you are three times as old as the younger person. 1 solutions Answer 376035 by richwmiller(9135)   on 2012-03-28 13:14:39 (Show Source): You can put this solution on YOUR website! 32+x=(13+x)*3 3.5 years ago 28.5=9.5*3

Rational-functions/592753: Find the critical point of the function Then, determine whether the point represents a maximum, minimum, or a point of inflection. Okay, I did this problem by hand and simplified the equation down to -2x^2+4x-7 using order of operations; I squared x-1, multplied the answer by -2, and subtracted 3 from that answer. Then I tried using the quadratic formula, but it didn't turn out. So I graphed my simplified equation (-2x^2+4x-7) and came up with an upside-down hyperbola with the max point at -5. Is this my answer? And if it is, how do I show my work for this since I used my calculator to graph? If this is wrong, please show me where I strayed and how to get to the correct answer. Any help you can give me will be greatly appreciated. Thank you and God bless you for your time! 1 solutions Answer 376034 by richwmiller(9135)   on 2012-03-28 13:11:42 (Show Source): You can put this solution on YOUR website! y = -2x^2+4x-5 not -7 so you are off by 2 the vertex is 1,-3