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Recent problems solved by 'richwmiller'

richwmiller answered: 9132 problems
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Graphs/285102: I really need help graphing these pairs on one graph very confusing. x = (0,0)(1,0)(2,0)(3,0)(-1,0)(-2,0)(-3,0) y = (0,-1)(0,-0.33)(0,-0.11)(0,-0.037)(0,-3)(0,-9)(0,-27) 1 solutions Answer 206733 by richwmiller(9143)   on 2010-03-25 03:28:55 (Show Source): You can put this solution on YOUR website! Nothing confusing, you just plot the points that is all there is to it. plot and plot some more. Don't know why you have one group labelled x and one y the points are generally labelled x,y but do what you must

Polygons/285105: the measure of four of the exterior angles of a pentagon are 57, 74, 56, and 66 what is the measure of the remaning angle? 1 solutions Answer 206731 by richwmiller(9143)   on 2010-03-25 03:24:39 (Show Source): You can put this solution on YOUR website! exterior angles add up to 360 subtract from 360 to get the "remaning" angle

Travel_Word_Problems/285110: two trucks start from the same point at the same time and go in opposite directions. One truck travels at 88 km/h and the other truck travels at 72 km/h. How long must they travel to be at least 672 km apart 1 solutions Answer 206730 by richwmiller(9143)   on 2010-03-25 03:21:58 (Show Source): You can put this solution on YOUR website! 88*x+72*x=672 (88+72)*x=672 160x=672 x=4.2 hours

Parallelograms/285112: In baseball, the area of each base is 225 square inches. Each base is a square. What is the length of each side of a base on a baseball field? 1 solutions Answer 206729 by richwmiller(9143)   on 2010-03-25 03:17:22 (Show Source): You can put this solution on YOUR website! A=225 s^2=225 s=15

Probability-and-statistics/285113: how long would it take a bus traveling at 60 mph to overtake a car traveling at 50 mph that had a 1.5 hour head start? 1 solutions Answer 206728 by richwmiller(9143)   on 2010-03-25 03:15:55 (Show Source): You can put this solution on YOUR website! 60x=50(x+1.5) 60x=50x+75 10x=75 x=7.5 think about it the car had a 75 mile head start the bus is gaining on the car at 10 mph so it will take 7.5 hours to make up the 75 miles.

Mixture_Word_Problems/285111: How many gallons of water should be added to 30 gallons of a solution that is 70% antifreeze in order to obtain a mixture that is 60% antifreeze? 1 solutions Answer 206727 by richwmiller(9143)   on 2010-03-25 03:13:00 (Show Source): You can put this solution on YOUR website! from the standpoint of antifreeze .7*30=.60*(30+x) 2.10=1.80+.6x .30=.6x 5=x x= 5 gallons of water from the standpoint of water (.3*30)+x=(30+x)*.4 9+x=12.+.4x .6x=3 multiply by 10 6x=30 x=5 gallons of water

Polynomials-and-rational-expressions/285114: How would you factor this polynomial? 5w^4-405 1 solutions Answer 206726 by richwmiller(9143)   on 2010-03-25 02:57:15 (Show Source): You can put this solution on YOUR website! are there any w's common to both terms? any numbers common to both terms?

Unit_Conversion_Word_Problems/285120: Kay wants to buy a new fireplace insert that will burn gas instead of wood. She normally uses two cords of wood winter. Wood costs $250/cord.She is interested in knowing how much she will save if she burns gas in the fireplace insert.Gas costs $0.70 per therm. One therm is 100,000 BTU. The fireplace insert burns 33,000 BTU per hour. Kay figures she will burn the fireplace 5 hours per day for 120 days. How much will she save in one winter if she burns gas instead of wood? 1 solutions Answer 206725 by richwmiller(9143)   on 2010-03-25 02:54:48 (Show Source): You can put this solution on YOUR website! 250*2 for the winter=$500 for the winter. But what does the fireplace insert cost including purchase delivery, installation and maintenance? You work backwards starting with what you know and working towards the amount saved. 5*120=600 hours 33,000*600=bTU's per hour=19,000,000 btu's 190*100,000 190 therms*.70 per therm $133 500-133=367 saved Solar energy is cheap but the initial cost is very high. Is it he same with the insert?

Polynomials-and-rational-expressions/285043: Susan can word process 75 pages in 8 hours. Tim can process the same # of pages in 13 hours. If they work together how long will it take to process 75 pages? 1 solutions Answer 206705 by richwmiller(9143)   on 2010-03-24 21:52:08 (Show Source): You can put this solution on YOUR website! x/8+x/13=1 x=104/21 abt 4.95

Quadratic_Equations/285044: 1.express y=(x-2)^2+4 in standard form. 1 solutions Answer 206704 by richwmiller(9143)   on 2010-03-24 21:42:58 (Show Source): You can put this solution on YOUR website! one problem at a time and no similar problems. Limit 4 problems daily.

real-numbers/285022: graph the circle x^ + y^ -4x + 8y = 24 1 solutions Answer 206703 by richwmiller(9143)   on 2010-03-24 21:38:52 (Show Source): You can put this solution on YOUR website! x^ means nothing if you mean x^2 (x squared) say so!

Linear-systems/285046: I need make two equations for this problem. if there were 4 people out at a restaurant and their meal cost $30 per plate what is the two equations using X and y x is for the people 1 solutions Answer 206702 by richwmiller(9143)   on 2010-03-24 21:33:09 (Show Source): You can put this solution on YOUR website! Not enough info! per plate or per dish or per person?

Graphs/285040: solve the inequality involving absolute values. Express answer in interval notation. 3x + 4 (Greater than, equal to) 2 1 solutions Answer 206701 by richwmiller(9143)   on 2010-03-24 21:29:21 (Show Source): You can put this solution on YOUR website! What are we graphing? Where are the absolute values? Why don't you use math symbols such as > = ?

Rational-functions/285002: How do you solve this promblem 5divided by x minus 5. plus x divided by 2x minus 10? 1 solutions Answer 206699 by richwmiller(9143)   on 2010-03-24 21:24:00 (Show Source): You can put this solution on YOUR website! Is it (5/x)-5 or 5/(x-5) Is it +(x/2x)-10 or +x/(2x-10)

Radicals/285037: 7x^6-14x^5+35x^4 factor completely, I know this should be basic but can I see the steps to how you factor this? 1 solutions Answer 206696 by richwmiller(9143)   on 2010-03-24 21:20:31 (Show Source): You can put this solution on YOUR website! x^4 can be factored. Start there.

Triangles/285016: Holly works in the product analysis division of a company. The tent shown includes a material floor. As part of Holly's cost analysis, she needs to determine the amount of material used to make the tent. Use the following dimensions to calculate the amount of material used to make this tent. L 7' w6'h4'slant5'. Tent has material floor which must also be counted. Please help. I have tried on this for 2 hours and cannot get the same answer two times. Please show me 1 solutions Answer 206695 by richwmiller(9143)   on 2010-03-24 21:17:50 (Show Source): You can put this solution on YOUR website! What do you mean by slant5' ? What is the shape of the tent?

Graphs/285036: Determine whether the graphs of the pair of lines are parallel. x+8=y y-8= -4 What is the slope of the line x+8=y. 1 solutions Answer 206694 by richwmiller(9143)   on 2010-03-24 21:14:54 (Show Source): You can put this solution on YOUR website! Is something missing from the second equation?

real-numbers/285023: add complex numbers (4=3i) + (-5+7i) give answer in complex form a+bi 1 solutions Answer 206693 by richwmiller(9143)   on 2010-03-24 21:10:41 (Show Source): You can put this solution on YOUR website! should the = be +? just add the 4 and -5 and add 3i and 7i

Graphs/285019: find the slop of the line that passes the P(4,2) and Q(-5,2) 1 solutions Answer 206691 by richwmiller(9143)   on 2010-03-24 21:05:08 (Show Source): You can put this solution on YOUR website! the "slop" is zero. It is a horizontal line.

Linear-equations/285031: y=5/4x-2, y=5/4x-1 1 solutions Answer 206690 by richwmiller(9143)   on 2010-03-24 21:01:33 (Show Source): You can put this solution on YOUR website! Nice set of equations! Did you notice they have the same slope and are therefore parallel. Yes indeed nice equations!

Proportions/259863: a bicycle chain moves along two sprockets when you shift gears. the number of teeth on the front sprocket form a ratio. equivalent ratios provide equal pedaling power. find a ratio equivalent to the ratio 52 over24 1 solutions Answer 206689 by richwmiller(9143)   on 2010-03-24 20:59:36 (Show Source): You can put this solution on YOUR website! 52/24=26/12=13/6

decimal-numbers/284938: how would you divide this on paper? 12 divide by .15 1 solutions Answer 206682 by richwmiller(9143)   on 2010-03-24 20:42:12 (Show Source): You can put this solution on YOUR website! .15=15/100 multiplying by the reciprocal is the same as division 12*100/15=4/5*100=80

Polynomials-and-rational-expressions/284960: 3/5 + 1/4 = 1/x the solution for x is ? 1 solutions Answer 206667 by richwmiller(9143)   on 2010-03-24 18:56:49 (Show Source): You can put this solution on YOUR website! convert 3/5 and 1/4 to fractions with lcd let's try 20 12/20+5/20=1/x 17/20=1/x x/1=20/17 x=20/17

Linear_Equations_And_Systems_Word_Problems/284964: Nicky said "you'll never guess my numbers! Their sum is 12 and their difference is 26." are there two such numbers? If so, what are they? 1 solutions Answer 206666 by richwmiller(9143)   on 2010-03-24 18:53:43 (Show Source): You can put this solution on YOUR website! a+b=12 a-b=26 2a=38 a=19 b=-7

Polynomials-and-rational-expressions/284975: im having trouble with FOIL can you please explain the concept? 1 solutions Answer 206665 by richwmiller(9143)   on 2010-03-24 18:51:32 (Show Source): You can put this solution on YOUR website! Better what do you think it means?

Rectangles/284968: find the area of each figure described: a square with diagonal 4cm 1 solutions Answer 206664 by richwmiller(9143)   on 2010-03-24 18:50:36 (Show Source): You can put this solution on YOUR website! to find the area we need to know the s^2 to find the ^2 we use the pythagorean theorem since the diagonal will be the hypotenuse. 2s^2=4^2 2s^2=16 s^2=8 area=s^2=8

Geometry_proofs/284971: Please help me with this problem! "Draw a diagram, provide the given and conclusion, and prove." "If one pair of opposite sides of a quadrilateral are both parallel and congruent, than it is a parallelogram." Thank you very much! 1 solutions Answer 206663 by richwmiller(9143)   on 2010-03-24 18:46:45 (Show Source): You can put this solution on YOUR website! Parallel is good but the congruent means they are the same length which means that the lines connecting the endpoints will also be congruent and parallel.

Geometry_Word_Problems/284860: The perimeter of a rectangle is 38cm. One side is 11 cm longer than the other side. Find the lengths of the sides. My attempt: P=2 (L) + 2 (W) 38 cm = 2 (11) + 2 (L) 38 cm = 22 + 2 (L) 38 cm = 24/38 1 solutions Answer 206632 by richwmiller(9143)   on 2010-03-24 14:35:33 (Show Source): You can put this solution on YOUR website! Which part of your equations says "11 cm longer" not "11 cm long"?

Linear-equations/284862: How do I solve this problem 12x-8/6? 1 solutions Answer 206631 by richwmiller(9143)   on 2010-03-24 14:34:05 (Show Source): You can put this solution on YOUR website! Equations are solved. Expressions are simplified. This is an expression. It can't be solved.

Systems-of-equations/284800: What is the value of Z in the solution of the system of equations? 2x + 3y + z = 9 x - 2y - z = 4 x - 3y + 2z = -3 1 solutions Answer 206629 by richwmiller(9143)   on 2010-03-24 14:21:54 (Show Source): You can put this solution on YOUR website! There is no Z in the system of equations. Z is not the same as z.

Polynomials-and-rational-expressions/284852: Add, and simplify 6/w + 1/w^2 = I came up with an answer of 6w+1w^2 is this correct? 1 solutions Answer 206628 by richwmiller(9143)   on 2010-03-24 14:16:47 (Show Source): You can put this solution on YOUR website! Multiply the first term by w/w Then you have (6w+1)/w^2 There really isn't much you can do with this.