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# Recent problems solved by 'richwmiller'

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 Subset/292474: the cardinal number of the set {yellow, blue, red, green, purple, orange} is 1 solutions Answer 211243 by richwmiller(9135)   on 2010-04-15 09:27:43 (Show Source): You can put this solution on YOUR website!"What is the cardinal number?" means "How many are in the set?"
 Triangles/292482: Can you calculate the value of x in a right triangle with legs of x and 2x-1 and a hypoyenuse of 2x-1? I have tried the pythagorean theorem but x = 0. I don't think it works because the leg and the hypotenuse are the same. Thanks.1 solutions Answer 211242 by richwmiller(9135)   on 2010-04-15 09:25:02 (Show Source): You can put this solution on YOUR website!The hypotenuse is the longest side. There can't be a side equal to it. check the problem Perhaps the hypotenuse is 2x+1. x^2+(2x-1)^2=(2x+1)^2 x=8 or 0
 Graphs/292462: x <-3<= I am stuck on this graph Can you please show me how to get it going1 solutions Answer 211241 by richwmiller(9135)   on 2010-04-15 09:18:21 (Show Source): You can put this solution on YOUR website!x <-3<= makes no sense What are you trying to say?
 Rectangles/292467: the area of a rectangle is 300 square inches. the sides are in a 3:4 ratio. what is the perimeter of the rectangle?1 solutions Answer 211240 by richwmiller(9135)   on 2010-04-15 09:13:51 (Show Source): You can put this solution on YOUR website!3x*4x=300 12x^2=300 x^2=25 x=5 p=2*(3x+4x)=14x=70
 Age_Word_Problems/292478: William is six years older than Robert. In two years, William will be twice as old as Robert. Find their ages. 1 solutions Answer 211239 by richwmiller(9135)   on 2010-04-15 09:09:27 (Show Source): You can put this solution on YOUR website!w=6+r w+2=2*(r+2) r=4 w=10
 Age_Word_Problems/292480: Bud's age is 1/7 the age of his uncle. If Bud is 8 years old, how old is his uncle? 1 solutions Answer 211238 by richwmiller(9135)   on 2010-04-15 09:06:24 (Show Source): You can put this solution on YOUR website!b=1/7*u b=8 8=1/7*u 56=u
 Geometric_formulas/292469: A boy standing on the shore of a lake 1 mile wide wants to go to the store 3 miles down the shore on the opposite side of the lake. If he swims at 2 miles per hour, and walks at 4 miles per hour, is it quicker for him to swim directly across the lake and then walk to the store, or is it quicker for him to swim directly to the store? Prove this mathematically. 1 solutions Answer 211237 by richwmiller(9135)   on 2010-04-15 09:04:35 (Show Source): You can put this solution on YOUR website!walk 3 and swim 1 4*w=3 w=3/4 2*s=1 s=2/4 s+w=5/4 swim diagonal 1^2+3^2=d^2 1+9=d^2 10=d^2 sqrt(10)=d 3.16=d 2*s=3.16 s=1.58 hours Faster and safer to walk first. .
 Square-cubic-other-roots/292471: how do i simplify this? 2 (times the square root of) 8 1 solutions Answer 211236 by richwmiller(9135)   on 2010-04-15 08:46:45 (Show Source): You can put this solution on YOUR website!No similar problems and one problem at a time 2*sqrt(8)=2*sqrt(4*2)=4sqrt(2)
 Quadratic_Equations/292443: If the roots of a quadratic equation are Real, equal and rational, then what is the value of b^2 -4ac? (1) 0 (2) <0 (3) >0 (4) 4 1 solutions Answer 211235 by richwmiller(9135)   on 2010-04-15 05:18:20 (Show Source): You can put this solution on YOUR website!>0 2 real =0 one real <0 2 complex(imaginary)
 Polynomials-and-rational-expressions/292441: Which polynomial is prime? a.2x^2 - 5x + 3 b.10x^2 - 11xw + 6w^2 c.9y^2 + 29yn + 6n^2 d.none of the above1 solutions Answer 211234 by richwmiller(9135)   on 2010-04-15 05:13:12 (Show Source): You can put this solution on YOUR website!b only has complex roots. 10*6=60 we need factors of 60 which add up to -11 -15 and 4 add up to -11 but the product is -60 not 60
 Exponential-and-logarithmic-functions/292401: Exponents and polynomials: How is this problem simplified? (2s ^-1t^3(-3) / 6s^2t^-4) please email asap and feel free to post this problem! thanks, lroy1 solutions Answer 211233 by richwmiller(9135)   on 2010-04-15 05:01:26 (Show Source): You can put this solution on YOUR website!Your problem is not clear. Is it 2*s^(-1)*t^3*(-3) / 6s^2*t^(-4) What is the (-3)? Is it part of the exponent or a coefficient? It is oddly placed for either.
 Circles/292115: What is the radius if the circumference is: (x + y)pi 1 solutions Answer 211232 by richwmiller(9135)   on 2010-04-15 04:53:37 (Show Source): You can put this solution on YOUR website!C=2*pi*r (x+y)*pi=2*pi*r x+y=2*r (x+y)/2=r
 Numeric_Fractions/292421: what is x? 1 solutions Answer 211231 by richwmiller(9135)   on 2010-04-15 04:50:49 (Show Source): You can put this solution on YOUR website!x=8 add 4 to both sides x/2-4=3x/4-6 x/2=3x/4-2 multiply by 4 2x=3x-8 add 8 2x+8=3x subtract 2x 8=x
 Proportions/292411: a-2/6 = 6a-8/a1 solutions Answer 211230 by richwmiller(9135)   on 2010-04-15 04:46:54 (Show Source): You can put this solution on YOUR website! or Neither comes out with nice neat answers
 Polygons/292414: what is the exterior angle measure for a regular 11-gon1 solutions Answer 211229 by richwmiller(9135)   on 2010-04-15 04:42:21 (Show Source): You can put this solution on YOUR website!360/11
 Surface-area/292397: I need help on finding an answer for the surface area of a cylinder. thank you this is the problem. r= 5ft h= 12ft thank you1 solutions Answer 211228 by richwmiller(9135)   on 2010-04-15 04:41:10 (Show Source): You can put this solution on YOUR website!Did you look for a formula?
 Linear-equations/292176: My 5th grader just started doing alegebra & Im so confused..can anyone tell me the definitions of the following....point, line, vertex, line segment, plane, vertical angles.....my email is beautynbeast1965@msn.com thx alot1 solutions Answer 211227 by richwmiller(9135)   on 2010-04-15 04:39:40 (Show Source): You can put this solution on YOUR website! Are you the beauty or the beast? lol All those terms should be in the glossary(dictionary in the back of the book) in your child's book as well in the chapters s/he is studying. Here is another place to look. http://www.eduplace.com/math/mw/models/overview/6_14_3.html
 Travel_Word_Problems/292396: Cleaning service number 1 can clean a certain office building in 30 hours, while the cleaning service number 2 can clean the same building in 20 hours. If the two companies work together, how long would it take to clean the building?1 solutions Answer 211225 by richwmiller(9135)   on 2010-04-15 04:34:05 (Show Source): You can put this solution on YOUR website!This is indeed a word problem. How did you decide that it is travel and distance word problem? x/30+x/20=1 2x+3x=60 5x=60 x=12 Together the two companies can do the job in 12 hours. check 12/30+12/20=1 2/5+3/5=1 ok
 Travel_Word_Problems/292418: two racers 15 miles apart start at the same time traveling in the same direction. after 6 hrs, the faster racer overtakes the slower. if they had traveled toward each other they would have met after 2 hrs. find the rate of each1 solutions Answer 211224 by richwmiller(9135)   on 2010-04-15 04:27:12 (Show Source): You can put this solution on YOUR website!6x+15=6y 2x+2y=15 x=5/2 y=5
 Proportions/292398: EXPLAIN WHY THE MULTIPLICATIVE INVERSE OF A NUMBER HAS THE SAME SIGN OF THE NUMBER? EXPLAIN WHY THE ADDITIVE INVERSE OF A NUMBER HAS THE OPPOSITE OF THE NUMBER1 solutions Answer 211223 by richwmiller(9135)   on 2010-04-15 04:19:14 (Show Source): You can put this solution on YOUR website!Stop yelling. And your problem is posted in the wrong category.
 Percentage-and-ratio-word-problems/292429: Edwin earned \$15.75 in 3 hr at part time job How much would he earn if he works 5 hrs.1 solutions Answer 211222 by richwmiller(9135)   on 2010-04-15 04:16:59 (Show Source): You can put this solution on YOUR website!15.75/3=5.25 per hr. 5.25*5=26.25
 Rational-functions/292251: Describe the vertical asymtopes and holes for the graph of y=(x-2)(x-2)/(x-2)(x+4) Thankyou!!!1 solutions Answer 211221 by richwmiller(9135)   on 2010-04-15 04:05:58 (Show Source): You can put this solution on YOUR website!Are you sure that is the equation? (x-2) would cancel out in the numerator and denominator. As it is, x cannot equal 2 nor -4.
 Miscellaneous_Word_Problems/292427: The ratio of girls to boys at woodrow wilson high school is 13:12 there are 416 girls. How many boys are there.1 solutions Answer 211220 by richwmiller(9135)   on 2010-04-15 03:59:04 (Show Source): You can put this solution on YOUR website!13/12=416/x x=384
 Polynomials-and-rational-expressions/292423: Please help me factor b to the 3rd power - 2b to the second power.1 solutions Answer 211219 by richwmiller(9135)   on 2010-04-15 03:54:45 (Show Source): You can put this solution on YOUR website!b^3-2b^2 factor out b^2 b^2*(b-2)
 Linear_Equations_And_Systems_Word_Problems/292428: Rita recieved a \$70 gift card for a coffee store. She used it in buying some coffe that cost \$8.58 per pound. After buying the coffe, she had \$35.68 left on her card. How many pounds of coffe did she buy?1 solutions Answer 211218 by richwmiller(9135)   on 2010-04-15 03:52:46 (Show Source): You can put this solution on YOUR website!(70-35.68)/8.58=p 4 = p
 Expressions-with-variables/292425: I need help please. I need to write out an algerbra expression/equation and then solve. If a budget is \$118,250.00, I need to find out what is 25% of that budget. Is the proper equation : What is 25% of \$118,250.00? Is this correct? If so then I can solve. Please advise. Thank you.1 solutions Answer 211217 by richwmiller(9135)   on 2010-04-15 03:49:10 (Show Source): You can put this solution on YOUR website!"What is 25% of \$118,250.00?" is not an equation. It is a question. It is the right question to set up an equation. Algebra not algerbra- one r.
 Miscellaneous_Word_Problems/292437: Can the following problem be solved for x? If (x+4) pounds of peaches cost \$5.50, what is the cost per pound? 5.50/(x+4) per pound1 solutions Answer 211216 by richwmiller(9135)   on 2010-04-15 03:45:21 (Show Source): You can put this solution on YOUR website!No.Not enough info. There is no equality and so no equation
 Expressions-with-variables/292420: Jill is painting a cut-out of Santa for a Christmas display. She decided to first paint the entire cut-out with white paint. She had to use all of a 6 ounce jar of white paint to do this. Her boss told her that she should make a new Santa that is twice as large as the first one. How much white paint will she need? I think the answer here is obvious. She would need double the paint to finish a Santa that is twice the size as the original. The problem I am having is setting up an algebraic equation for this problem.1 solutions Answer 211215 by richwmiller(9135)   on 2010-04-15 03:40:00 (Show Source): You can put this solution on YOUR website!Actually she would need 4 times the paint. let's say Santa was 2 in by 6 in that would be an area of 12 sq in. If we double the dimensions, we would have 4 by 12 which is 48 sq in If we only double the height he would be stretched. a=x*y n=2x*2y=4*xy 4*xy=4*a
 Equations/292331: If you bought something at the sale price of \$315.00 at 30% off. What was the original price ???1 solutions Answer 211196 by richwmiller(9135)   on 2010-04-14 21:23:24 (Show Source): You can put this solution on YOUR website!.7x=315 x=450
 Surface-area/292335: Can you please please help me find the area of a dodecan in the simplest way possible. I've tried looking for help on other web sites but the formulas are so complicated i have no idea what they are talking about. Thanks so much1 solutions Answer 211171 by richwmiller(9135)   on 2010-04-14 20:09:06 (Show Source): You can put this solution on YOUR website!Do you mean dodecagon, a twelve sided figure?
 Square-cubic-other-roots/292291: How can you type in the square root of something?1 solutions Answer 211170 by richwmiller(9135)   on 2010-04-14 20:01:07 (Show Source): You can put this solution on YOUR website!sqrt(9) surrounded by 3 { and 3 } root(2,9) surrounded by 3 { and 3 }