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Recent problems solved by 'richwmiller'

richwmiller answered: 9124 problems
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Probability-and-statistics/730224: in a fifty question true false examination a student must achieve twenty five correct answers required to pass. 1 solutions Answer 446554 by richwmiller(9135)   on 2013-03-25 09:10:00 (Show Source): You can put this solution on YOUR website! already asked

Quadratic_Equations/730217: what is the roots of the function 1 solutions Answer 446553 by richwmiller(9135)   on 2013-03-25 09:06:36 (Show Source): You can put this solution on YOUR website! already asked

test/730159: In a lake, there is a patch of lily pads. Every day the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake? 1 solutions Answer 446529 by richwmiller(9135)   on 2013-03-25 01:04:27 (Show Source): You can put this solution on YOUR website! 47 days it is half full on day 47 every day it doubles so on day 48 it is full

Polynomials-and-rational-expressions/730164: 1.8xy/18x^2y * 24xy^2/16y^3 2.-14a^2b^z/6b^3 / 21a/15ab 3. 2/x-2 - 2/x+2 - 4/x^3-4x 1 solutions Answer 446527 by richwmiller(9135)   on 2013-03-25 01:00:05 (Show Source): You can put this solution on YOUR website! Thank you Those are lovely expressions

Geometry_Word_Problems/730170: Write the equation of the line that passes through (-2,4) and is parallel to the graph of the line y=4x+5 I have tried but I can't figure It out. Please help 1 solutions Answer 446526 by richwmiller(9135)   on 2013-03-25 00:59:41 (Show Source): You can put this solution on YOUR website! what have you tried. this is easy y=mx+b slope is m plug in -2 for x and 4 for y and find b 4=-2(4)+b

Travel_Word_Problems/730174: Ann is riding on a bike course that is miles long. So far, she has ridden miles of the course. What percentage of the course has Ann ridden so far? 1 solutions Answer 446525 by richwmiller(9135)   on 2013-03-25 00:54:37 (Show Source): You can put this solution on YOUR website! You left out the numbers

Circles/730178: How do you find this if both sides are squared Finding the radius and centre of a circle. 1.)(x-4)^2+(y-5)^2=16 1 solutions Answer 446524 by richwmiller(9135)   on 2013-03-25 00:52:05 (Show Source): You can put this solution on YOUR website! centre (4,5) radius 4

Circles/730179: Hello just wondering if this type of question is possible to solve when finding the radius and centre of a circle?? x^2+5^2-14x+32y=0 1 solutions Answer 446523 by richwmiller(9135)   on 2013-03-25 00:47:12 (Show Source): You can put this solution on YOUR website! It's a parabola not a circle did you really mean 5^2? put y^2 instead of 5^2 and it is a circle

Rectangles/730177: Among all rectangles having a perimeter of 19 m, find the dimensions of the one with the largest area. 1 solutions Answer 446522 by richwmiller(9135)   on 2013-03-25 00:43:47 (Show Source): You can put this solution on YOUR website! a square will have the largest area

Word_Problems_With_Coins/730089: Tulips sell for $1.25 each and roses sell for 2.00$ each. $116 worth are sold. How many roses were sold if 3 times as many roses as tulips were sold? 1 solutions Answer 446458 by richwmiller(9135)   on 2013-03-24 20:40:53 (Show Source): You can put this solution on YOUR website! r=3t, 1.25t+2r=116 r=48., t=16.

Numeric_Fractions/730037: jordan made 3/5 of a recipe that called for 2 1/3 cups sugar how much sugar was needed 1 solutions Answer 446450 by richwmiller(9135)   on 2013-03-24 20:20:31 (Show Source): You can put this solution on YOUR website! 2 1/3=7/3 7/3*3/5=7/5 =1 2/5 or 1.4 cups

Travel_Word_Problems/729976: She rode a bike for 5 miles then she walked for another 2 miles. she can ride her bike twice as fast as she can walk. The entire trip tool 2 hours . How fast can she walk 1 solutions Answer 446447 by richwmiller(9135)   on 2013-03-24 20:12:10 (Show Source): You can put this solution on YOUR website! time b+w=2, B*b=5, W*w=2, speed B=2W b = 10/9, B = 9/2, w = 8/9, W = 9/4

Miscellaneous_Word_Problems/730055: In the lab, Carlos has two solutions that contain alcohol and is mixing them with each other. He uses times as much Solution A as Solution B. Solution A is alcohol and Solution B is alcohol. How many milliliters of Solution A does he use, if the resulting mixture has milliliters of pure alcohol? 1 solutions Answer 446443 by richwmiller(9135)   on 2013-03-24 20:00:33 (Show Source): You can put this solution on YOUR website! you seem to have left out the numbers

Polynomials-and-rational-expressions/730071: Divide (3b^2+2b-5) by (b-2) I keep getting 3b-4 3/b-2 for an answer. Am I writing the remainder wrong? 1 solutions Answer 446442 by richwmiller(9135)   on 2013-03-24 19:57:59 (Show Source): You can put this solution on YOUR website! You divided incorrectly (3b+8)with remainder 11/(b-2)

Complex_Numbers/730066: Hello,The problem looks like this... Solve the equation; find all solutions, including complex solutions: x^3 + 5x + 4 = 4(x^2 + 1) I've tried to take the right side of the equation and distribute the 4, then subtracting the individual terms from the left side leaving me with x^3 - 4x^2 + 5x = 0 Then I tried to factor out x from the right side x(x^2 -4^x + 5) = 0 I cant do much more because of the sign in front of the 4 being (-) and the sign in front of 5 being +. So I tried using imaginary numbers on the right side leaving me with.... x^3 + 5x +4 = (2x + 2i)(2x - 2i) and now im stuck confused and irritated. I don't know if I'm doing any of the step work correctly. 1 solutions Answer 446438 by richwmiller(9135)   on 2013-03-24 19:47:30 (Show Source): You can put this solution on YOUR website! x(x^2 -4^x + 5) = 0 x = 2+i x = 2-i x=0

Word_Problems_With_Coins/729933: randy has a jar containing 51 coins, all quarters and nickels. totaling $5.55. how many quarters are in the jar? 1 solutions Answer 446435 by richwmiller(9135)   on 2013-03-24 19:38:15 (Show Source): You can put this solution on YOUR website! q+n=51 n=51-q 25q+5n=555 5q+n=111 5q+51-q=111 4q=60 q=15 n=36

Graphs/730063: I NEED HELP PLEASE W/ THIS QUESTION !!! ~ Given the line y= 2/5x + 6, find the equation of the line passing through the point (0,6) [ added : and perpendicular to the given equation] 1 solutions Answer 446430 by richwmiller(9135)   on 2013-03-24 19:30:25 (Show Source): You can put this solution on YOUR website! It is a poorly written question. There is an infinite number of lines through (0,6) What is the relationship to the given equation? parallel? perpendicular? something else? perpendicular means the slopes multiplied equal -1 the slope of the first equation is 2/5 so we need -5/2 y=mx+b 6=5/2*0+b 6=b y=-(5/2)*x+6

Geometry_Word_Problems/730056: what is the area of the shape left when a circle of radius 3 inches is cut from the middle of a square with a 10 inch diameter? 1 solutions Answer 446429 by richwmiller(9135)   on 2013-03-24 19:27:11 (Show Source): You can put this solution on YOUR website! squares don't have diameters

Travel_Word_Problems/729792: If you drove 35 miles in an hour how many feet would you drive a minute? 1 solutions Answer 446242 by richwmiller(9135)   on 2013-03-24 03:03:00 (Show Source): You can put this solution on YOUR website! multiply by 5280 ft in a mile an multiply by 60 minutes in an hour

Travel_Word_Problems/729169: A family drove 45 miles and they hiked 2 miles to their campsite. The trip took 1 hour and 15 minutes. If they drove 56 mph faster than they hiked, how fast did they drive? 1 solutions Answer 445749 by richwmiller(9135)   on 2013-03-21 19:03:49 (Show Source): You can put this solution on YOUR website! x+y=1.25, r*x=56, (r-56)*y=2 r=61.8132, x=0.905955, y=0.344045 I don't like these answers

Word_Problems_With_Coins/729159: Penny has a total of 18 coins made up of nickels and quarters. When totaled they add up to $1.90. There are three more nickels than twice the number of quarters. I am having a total blank please help. 1 solutions Answer 445747 by richwmiller(9135)   on 2013-03-21 18:47:10 (Show Source): You can put this solution on YOUR website! n+q=18, 5n+25q=190 we don't need the last part. n=2q+3 q=5 n=13

Linear-equations/729158: How do you graph the linear equation y=-2 using a table of values 1 solutions Answer 445746 by richwmiller(9135)   on 2013-03-21 18:42:32 (Show Source): You can put this solution on YOUR website! it is a straight horizontal line below the x axis plot any point where y=-2 follow the straight line

Surface-area/728967: when i make a rectangle it is of 64 cm area but when i cut it in 4 parts of different shapes its area is of 65 cm how 1 solutions Answer 445661 by richwmiller(9135)   on 2013-03-21 12:34:00 (Show Source): You can put this solution on YOUR website! 64 cm is a linear dimension is is not a measurement of area.

Probability-and-statistics/728970: A statistics professor decides to give a final exam that has only 12 true-false questions. Suppose a student taking that exam guesses on every question. Let X represent the number of questions the student gets correct on the exam. Explain why X can be considered a binomial random variable. If the student must answer at least 70% of the questions correctly to pass the exam, what is the minimum number of questions the student must answer correctly to pass, and what is the associated probability? 1 solutions Answer 445658 by richwmiller(9135)   on 2013-03-21 12:24:25 (Show Source): You can put this solution on YOUR website! 70% of 12 is 8.4 so he must get at least 9 correct which is really 75%.

Average/728977: mattis average on her first 3 test was 88 . What score does she need on her fourth test to make her average exactly 90 ? 1 solutions Answer 445654 by richwmiller(9135)   on 2013-03-21 12:12:50 (Show Source): You can put this solution on YOUR website! (3*88+x)/4=90 x=96 another way 88 misses 90 by 2 3*2=6 90+6=96 another way 4*90=360 3*88=264 360-264=96

logarithm/728974: How do you solve 12^(2x-8)=15 1 solutions Answer 445653 by richwmiller(9135)   on 2013-03-21 12:02:07 (Show Source): You can put this solution on YOUR website! factor out 2 in the exponent 144^(x-4) = 15 144^y=15 x = 4.5449

Linear-equations/728599: Find the intercepts of the equation 2x+6y=11. Write the answers as ordered pairs. All work must be shown. 1 solutions Answer 445514 by richwmiller(9135)   on 2013-03-20 15:41:27 (Show Source): You can put this solution on YOUR website! let x=0 find y let y=0 find x

Polynomials-and-rational-expressions/728569: I dont understand how to solve this problem: Original Equation: [(x)/(x-3)] - [(2)/(x+8)]= [(78)/(x^2+5x-24)] What I did: Multiplied left side of the equation to get common denominator: (x+8)[(x)/(x-3)] - (x-3)[(2)/(x+8)] I get this when simplified: [x^2+6x+6/(x^2+5x-24)]=[(78/(x^2+5x-24)] I mult each side by denom: so... x^2+6x+6=78 subtract and simplify: x^2+6x-72=0 But after this step I find that I can not factor it. If i put no solution in as the answers, it is wrong. When did I go wrong? 1 solutions Answer 445513 by richwmiller(9135)   on 2013-03-20 15:38:46 (Show Source): You can put this solution on YOUR website! from [x^2+6x+6/(x^2+5x-24)]=[(78/(x^2+5x-24)] we get (x^2+6 x+6)/((x-3) (x+8)) = 78/((x-3) (x+8)) (x^2+6 x-72)/((x-3) (x+8)) = 0 ((x-6) (x+12))/((x-3) (x+8)) = 0 x=6 x=-12

Rate-of-work-word-problems/728586: Two landscape workers can complete a certain landscaping job in a total of 20 hours. Working alone, one can do the same job in 2 hours less time than it takes the other. How long would it take the faster worker to do the job if the slower worker were unable to work? (Use calculator to find approx. value, but how intended computation.) 1 solutions Answer 445510 by richwmiller(9135)   on 2013-03-20 15:28:33 (Show Source): You can put this solution on YOUR website! 20x+20/(x+2)=1 x= about 39 and 41 20/39+20/41=1

Percentage-and-ratio-word-problems/728464: 12 ounces of concentrate mix with 3 1/2 cans of water, each can holds 12 ounces of water. What is the greatest number of 8 ounce cups that can be served? 1 solutions Answer 445424 by richwmiller(9135)   on 2013-03-20 10:06:38 (Show Source): You can put this solution on YOUR website! (12+3.5*12)/8 54/8 6 full 8 ounce cups

Evaluation_Word_Problems/728450: Kerry asked the bank teller to cash a $390 check using $20 bills and $50 bills. If the teller gave her a total of 15 bills, how many of each type of bill did she receive? 1 solutions Answer 445421 by richwmiller(9135)   on 2013-03-20 09:58:50 (Show Source): You can put this solution on YOUR website! t+f=15, 20t+50f=390 trail and error method there have to be at least 2 20's and one 50 to make the 90 that's three bills we need 12 more we can't have just 2 fifty's so try 3 50's 3 50's would mean 12 20's 150 and 240 work