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Recent problems solved by 'richwmiller'

richwmiller answered: 9133 problems
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Proportions/585022: A fraction has a reduced ratio of 2:5. When 5 is added to both the numerator and the denominator, the new reduced ratio is 1:2. Find the original fraction. 1 solutions Answer 373042 by richwmiller(9144)   on 2012-03-10 07:17:43 (Show Source): You can put this solution on YOUR website! (2x+5)/(5x+5)=x/2x x=5 check 10/25=2/5 ok 15/30=1/2 ok original fraction is 10/25

Rational-functions/585030: A telephone company offers you an opportunity to sell prepaid, 30 minute long-distance phone cards. You will have to pay the company a one-time set-up fee of $200. Each phone card will cost you $5.70. How many cards would you have to sell before your average total cost per card falls to $8? 1 solutions Answer 373041 by richwmiller(9144)   on 2012-03-10 07:14:49 (Show Source): You can put this solution on YOUR website! y=mx+b y=mx+200 y=5.70x+200 8x=5.7x+200 2.3x=200 x=86.95 so you have to sell 87 cards to get the average cost down to 8 dollars each

Length-and-distance/585024: 3/4 of a pole is above the ground. If 8 feet of the pole is below the ground, find the amount above the ground. 1 solutions Answer 373040 by richwmiller(9144)   on 2012-03-10 07:08:28 (Show Source): You can put this solution on YOUR website! 1-.75=.25 .25x=8 x=32 total 8 below 8/32=1/4 below 24/32=3/4 above 24 above

Mixture_Word_Problems/585005: Hannah is mixing two types of Easter candy. The chocolates cost $5 a pound, and the caramels cost $4 a pound. If she creates 8 pounds worth $4.25 a pound, how much of the chocolate did she use? 1 solutions Answer 373039 by richwmiller(9144)   on 2012-03-10 07:04:52 (Show Source): You can put this solution on YOUR website! h= chocolates a= caramel 5h+4a=8*4.25 a+h=8 a=6 h=2

Mixture_Word_Problems/584860: a solution of 79% is to be mixed with a solution of 21% to form 638 liters of 52% solution. how many liters of the 79% solution must be used 1 solutions Answer 372957 by richwmiller(9144)   on 2012-03-09 15:14:58 (Show Source): You can put this solution on YOUR website! .79x+.21y=.52*638 x+y=638 x=341 y=297

Numeric_Fractions/584909: -7/8 divided by - 5/24 1 solutions Answer 372956 by richwmiller(9144)   on 2012-03-09 15:11:26 (Show Source): You can put this solution on YOUR website! -7/8/-5/24 -7/8*24/-5 -7/-5*24/8 21/5=4.2

Linear-equations/584905: This Equation is the only homework problem I am not able so solve. d=pz+s.Z is the independent variable. 1 solutions Answer 372955 by richwmiller(9144)   on 2012-03-09 15:09:27 (Show Source): You can put this solution on YOUR website! So what do you want to know? d=pz+s is an equation with 4 unknowns. Not enough info to solve it.

Probability-and-statistics/584895: Taylor made up a tournament test. Taylor’s test consists of true/false questions and fill-in-the-blank questions. There are 24 questions on the test. If the true/false questions are worth three points each and the fill-in-the-blank questions are worth seven points each for a total of 100 points, how many of the questions are fill-in-the blank questions? 1 solutions Answer 372953 by richwmiller(9144)   on 2012-03-09 15:04:38 (Show Source): You can put this solution on YOUR website! x+y=24 3x+7y=100 x=17 y=7

Mixture_Word_Problems/584871: eighty percent of G is 352. What is G? If G = 3/H + 4, then H =. If P/ 5 = Q, then P/10 =. what number is halfway between 2/9 and 4/5? how is 4,345,000,000 written in scientific notation? 1 solutions Answer 372952 by richwmiller(9144)   on 2012-03-09 15:01:16 (Show Source): You can put this solution on YOUR website! .8g=352 g=352/.8 g=440

Length-and-distance/584900: A 200-foot board is to be cut into two pieces whose lengths are in the ratio of 7 to 3. Find the lengths of the two pieces 1 solutions Answer 372951 by richwmiller(9144)   on 2012-03-09 14:58:41 (Show Source): You can put this solution on YOUR website! 140 (7*20) and 60 (3*20)

Probability-and-statistics/584872: HE LENGTHS OF THE FIRST 10 WORDS OF 2 BOOKS ARE LISTED BELOW. FIND THE RANGE, VARIANCE, AND STANDARD DEVIATION FOR EACH OF THE TWO SAMPLES. THEN COMPARE THE TWO SETS OF RESULTS. DO THESE APPEAR TO BE A DIFFERENCE IN THE VARIATION? "Book 1:6,4,4,4,4,5,6,6,3,4," "Book 2:11,9,8,1,5,8,9,1,4,1" FIND THE RANGE FOR BOOK 1: RANGE = ________LETTERS. FIND THE RANGE FOR BOOK 2: RANGE= ________LETTERS. -FIND THE SAMPLE VARIANCE AND SAMPLE STANDARD DEVIATION FOR BOOK 1. SAMPLE VARIANCE = __________LETTERS (squared) (round to one decimal place as needed), SAMPLE STANDARD DEVIATION= _______ (DO NOT ROUND UNTIL THE FINAL ANSWER. THEN ROUND TO ONE DECIMAL PLACE AS NEEDED.) FIND THE SAMPLE VARIANCE AND SAMPLE STANDARD DEVIATION FOR BOOK 2: SAMPLE VARIANCE = ________LETTERS (Squared) Round to one decimal place as needed. SAMPLE STANDARD DEVIATION: ________ (DO NOT ROUND UNTIL THE FINAL ANSWER. THEN ROUND TO ONE DECIMAL PLACE AS NEEDED.) -IS THERE A DIFFERENCE IN VARIATION BETWEEN THE TWO BOOKS? A.YES, THERE IS MUCH LESS VARIATION AMONG THE WORLD LENGTHS IN BOOK 2. B.YES, THERE IS MUCH LESS VARIATION AMONG THE WORLD LENGTHS IN BOOK 2. C.NO, THERE IS NOT A DIFFERENCE IN THE VARIATION. 1 solutions Answer 372947 by richwmiller(9144)   on 2012-03-09 14:53:38 (Show Source): You can put this solution on YOUR website! Why are you shouting? Very rude!

Numbers_Word_Problems/584897: if the difference of an integer squared and twice the integer is 63, find the integer I set it up as x^2 -2x = 63 and then factored bu I don't think it is right 1 solutions Answer 372946 by richwmiller(9144)   on 2012-03-09 14:52:47 (Show Source): You can put this solution on YOUR website! x^2 -2x = 63 x^2 -2x - 63=0 (x+7)*(x-9)=0 x=9 and x=-7

Probability-and-statistics/584887: A student's accounting note consists of 3 notebooks, each notebook has 40 leaves and each leaf has 32 lines and each line on the average contains 24 characters including special symbols. If the student wishes to word process his note, what % of the 3 1/2 standard high density floppy disk will the content occupy? 1 solutions Answer 372944 by richwmiller(9144)   on 2012-03-09 14:50:50 (Show Source): You can put this solution on YOUR website! No one uses 3.5 floppies any more. You can't even buy them. I have some for sale.

Geometry_proofs/584886: using the writing a proof format, prove the isosceles triangle theorem. statement: Restatement: Given: diagram: Statements and Reasons _______________________________ 1. 1 solutions Answer 372943 by richwmiller(9144)   on 2012-03-09 14:49:11 (Show Source): You can put this solution on YOUR website! What is your isosceles triangle theorem?

Travel_Word_Problems/584874: A travels from town M to town N while B travels from town N to town M. They start out at the same time, and B travels three times as fast as A. If they meet each other six hours later, when will they arrive at their respective destination? 1 solutions Answer 372942 by richwmiller(9144)   on 2012-03-09 14:47:20 (Show Source): You can put this solution on YOUR website! distance is x They meet at y x-y b=3a r*t=d 3a*6=x-y 6a=y x=24a y=6a A will arrive in 18 more hours and B will arrive in 2 more hours

Word_Problems_With_Coins/584880: Gina has a tube that she is filling with dimes. When the tube is full she deposits the dimes into her savings account. Each deposit is $292.60. The dimes are each 1.35 millimeters thick. How tall is the tube Gina is using? 1 solutions Answer 372938 by richwmiller(9144)   on 2012-03-09 14:27:34 (Show Source): You can put this solution on YOUR website! divide 29260 by 10=2926 dimes 2926*1.35=3950.1 mm= 3.9501 meters

Proportions/584885: A basketball player is about 7 ft tall. A 2nd grader is about 3.5 ft. tall. Why is the basketball player more than twice the weight of the 2nd grader? 1 solutions Answer 372937 by richwmiller(9144)   on 2012-03-09 14:23:43 (Show Source): You can put this solution on YOUR website! It is a law of physiology.

Length-and-distance/584817: A plane flies from City X to City Y against the wind in 8 hours, and flies back from City Y to City X with the wind in 5 hours. If the speed of the plane is 650 mph, find the speed of the wind (mph)?. Thanks. 1 solutions Answer 372914 by richwmiller(9144)   on 2012-03-09 12:29:48 (Show Source): You can put this solution on YOUR website! r*t=d (650+w)*5=(650-w)*8 w=150

Probability-and-statistics/584806: I can't figure out this problem, can you show me step by step how to do it? p = $250, r = 0.04, n = 5---can you help me with this?---thanks Terry Little 1 solutions Answer 372913 by richwmiller(9144)   on 2012-03-09 12:28:12 (Show Source): You can put this solution on YOUR website! There is no problem. Try again. You just gave us the data.

Equations/584837: Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2-4x-8y+4=o 1 solutions Answer 372912 by richwmiller(9144)   on 2012-03-09 12:27:00 (Show Source): You can put this solution on YOUR website! already asked.

Sequences-and-series/584818: My grade in a certain math class is determined by three tests. My highest test score will count for 50% of my grade and my lowest for 20%; the "middle" test score will count for 30%. I must have a weighted average of 60 in order to pass the class. If I have already earned scores of 70 on my first two tests, what is the lowest score I can earn on the third test for which I will still pass the class? 1 solutions Answer 372911 by richwmiller(9144)   on 2012-03-09 12:25:42 (Show Source): You can put this solution on YOUR website! .5x+.3y+.2z=60 x>y>z if x=100 then .5*100+.3*70+.2*70=85 if z=20 then .5*70+.3*70+.2*20=60 If you get a 20 on the third test, your average will be 60

Permutations/584822: A company car that has a seating capacity of seven is to be used by seven employees who have formed a car pool. If only four of these employees can drive, how many possible seating arrangements are there for the group? 1 solutions Answer 372910 by richwmiller(9144)   on 2012-03-09 12:20:14 (Show Source): You can put this solution on YOUR website! 4*6*5*4*3*2*1

logarithm/584826: Solve 2^6x+5=31 I need to know the step by step instructions as everything I do seems to be wrong. I need help on this ASAP. Thanks This need to go to 4 decimal places 1 solutions Answer 372909 by richwmiller(9144)   on 2012-03-09 12:19:10 (Show Source): You can put this solution on YOUR website! What have you tried?

test/584834: I live in the Rio Grande valley. is their local tutors for free 1 solutions Answer 372907 by richwmiller(9144)   on 2012-03-09 12:17:55 (Show Source): You can put this solution on YOUR website! Not likely. Just submit your questions and problems here.

Rate-of-work-word-problems/584833: If Sammy can mow a lawn in 3 hours and Laura can mow the same lawn in 4 hours, how long will it take them if they work together? 1 solutions Answer 372905 by richwmiller(9144)   on 2012-03-09 12:16:53 (Show Source): You can put this solution on YOUR website! x/3+x/4=1 4x+3x=12 7x=12 x=12/7 =1 5/7 hrs about 1 hr 43 minutes

Surface-area/584709: The area of four walls of a room with length 10 inches, width 8 inches and height 6 inches is ?? 1 solutions Answer 372852 by richwmiller(9144)   on 2012-03-09 04:52:26 (Show Source): You can put this solution on YOUR website! What kind of room is measured in inches? Who fits in a room 6 inches high? two walls measure 10*6 and two walls measure 8*6 2*10*6+2*8*6 12*10+12*8 12*18=216 sq in

Numbers_Word_Problems/584712: the difference of the digits of a two-digit number is 8 and their sum is 10. what is the number ? 1 solutions Answer 372851 by richwmiller(9144)   on 2012-03-09 04:47:39 (Show Source): You can put this solution on YOUR website! x-y=8 x+y=10 2x=18 x=9 y=1 91 or 19

Evaluation_Word_Problems/584686: a general arranges 120419 men in the form of largest solid square, and finds 10 men extra. the number of men per row is: (1) 347 (2) 343 (3) 349 (4) 309 1 solutions Answer 372850 by richwmiller(9144)   on 2012-03-09 04:46:33 (Show Source): You can put this solution on YOUR website! 347^2=120409

test/584688: a square field has an area of 479 ft^2 what is the approximate length of the field 1 solutions Answer 372849 by richwmiller(9144)   on 2012-03-09 04:44:21 (Show Source): You can put this solution on YOUR website! 22^2=484 21^2=441 about 22 feet

Numbers_Word_Problems/584692: Lina bought CDs at $5 each and sold them at $8 each. To promote sales, all customers who bought 2 CDs were given 1 free CD. After she had sold all her CDs, Lina made a profit of $660 despite giving away 120 CDs to her customers. How many of Lina's customers bought only one CD? 1 solutions Answer 372848 by richwmiller(9144)   on 2012-03-09 04:39:49 (Show Source): You can put this solution on YOUR website! 240 sold 240*8=$1920 received 120 given away 360 *5=1800 cost 1920-1800=120 profit on selling 240 and giving away 120 CDs. She made one dollar profit on the deal of giving away one for every two sold. cost 15 for the three cds and received 16 for two sold profit 16-15=1 dollar. So she must have made 540 profit on the singles. 660-120=540 profit on single CDs. She made a profit of three dollars on each single cd. 540/3=180 singles sold 180*3=540 360=240+120 (240 sold and 120 given away) 240+120+180=540 sold or given away

test/584685: Suppose an auto racer won a 400 mile race with a time of 1:43:47.6734. At one point, the racer was 60 miles closer to the finish than the start. How far had the racer gone at that point? How far from the start was the racer? 1 solutions Answer 372846 by richwmiller(9144)   on 2012-03-09 04:24:45 (Show Source): You can put this solution on YOUR website! 400-60=340 340/2=170 170+60=230 After going 230 miles, the racer is 60 miles closer to the finish than to the start.