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 Linear_Equations_And_Systems_Word_Problems/284667: Working alone, it takes Emily seven hours to dig a 10ft by 10ft hole.1 solutions Answer 206502 by richwmiller(9132)   on 2010-03-23 21:44:53 (Show Source): You can put this solution on YOUR website!This belongs under word problems rate of work category. I was going to solve this but then noticed that you submitted the exact same problem at least 4 times that I saw.
 Linear-systems/284572: -2(x+3)<-51 solutions Answer 206498 by richwmiller(9132)   on 2010-03-23 21:29:19 (Show Source): You can put this solution on YOUR website!The other tutor forgot to switch signs after dividing by a minus should be x>-1/2
 Surface-area/284644: Hi, my question is that what is the surface area of a box five feet long, three feet wide, and seven feet high?1 solutions Answer 206495 by richwmiller(9132)   on 2010-03-23 21:26:01 (Show Source): You can put this solution on YOUR website!how would you find any surface area? How about the surface area of rectangle? A box has 6 surfaces. top bottom are the same the ends are the same and the sides are the same. so that is three different surfaces twice each
 Rational-functions/284561: What is the answer to the rational expression, (x-5)(x+4)/(x+5)(x-5)?1 solutions Answer 206494 by richwmiller(9132)   on 2010-03-23 21:22:54 (Show Source): You can put this solution on YOUR website!First what is the question?
 Linear-equations/284647: Write the variation, and find the quantity indicated. r varies directly as s. Find r when s = 13 and k = 14. The variation is ______ (Type k for the variation constant. Do not substitute in values) 1 solutions Answer 206492 by richwmiller(9132)   on 2010-03-23 21:20:39 (Show Source): You can put this solution on YOUR website!r=ks go from there.
 Graphs/284652: Determine which ordered pairs are part of the solution set for each inequality. y<3-2x,{(0,4),(-1,3),(6,-8),(-4,5)}1 solutions Answer 206490 by richwmiller(9132)   on 2010-03-23 21:17:22 (Show Source): You can put this solution on YOUR website!It is matter of testing them better your time than mine. just plug in the given x's and y's and see if the results fit the inequality if they do then they are part of the solution set.
 Linear-equations/284649: If z varies inversely as w, and z = 10 when w = 0.5, find z when w = 30. z = ___ (Round to the nearest thousandth) 1 solutions Answer 206488 by richwmiller(9132)   on 2010-03-23 21:14:51 (Show Source): You can put this solution on YOUR website!your job is to find k z=k/w plug in given value of z and w and find k then after you have found k plug in 30 for w and find z
 Numbers_Word_Problems/284631: m-2 / 3m + 9 * m^2 + 6m + 9 / 2m^2 - 8 Please show all steps in solving this problem.1 solutions Answer 206486 by richwmiller(9132)   on 2010-03-23 21:12:37 (Show Source): You can put this solution on YOUR website!This problem has nothing to do with consecutive numbers little to do with numbers at all. It is not a word problem and it is written poorly. Rewrite with many parentheses. It could have a million different meanings
 Equations/284563: Please help me with this. s + 66 = 481 solutions Answer 206483 by richwmiller(9132)   on 2010-03-23 21:06:11 (Show Source): You can put this solution on YOUR website!What do you think should be done?
 Inequalities/284636: Why does the inequality sign change when both sides are multiplied or divided by a negative number?1 solutions Answer 206481 by richwmiller(9132)   on 2010-03-23 21:02:37 (Show Source): You can put this solution on YOUR website!Because the number line for negative numbers is opposite the number line for positive numbers.
 Triangles/284564: One angle of a triangle is a right angle. The third angle is three times the smallest angle. what are their measures? I have tried setting up an equation: 180= 90 + 3x + x -------- -90 90= 3x + x ------- 3 30= x but it didn't work because if this answer is substituted back in it doesn't work. I'm not sure if i just solved the equation wrong or if it is the wrong equation all together. If you can help me it will be greatly appreshiated:) 1 solutions Answer 206480 by richwmiller(9132)   on 2010-03-23 21:00:51 (Show Source): You can put this solution on YOUR website!You were good up to 90=3x+x you divided the 90 by 3 and 3x by 3 but you forgot the other x anyways it was the wrong move 90=3x+x add 3x+x to get 4x 90=4x now divide by 4
 Linear_Algebra/284604: you can rent a car a day from company A for \$49 plus \$o.10 a mile or from company B for\$29 plus\$o.18 a mile. Formulate a systems of equation that can be used to help make a decision about which country to rent from. let x = number of miles and y= total cost of car.1 solutions Answer 206478 by richwmiller(9132)   on 2010-03-23 20:48:35 (Show Source): You can put this solution on YOUR website!I vote for renting from Spain!
 Probability-and-statistics/284627: Suppose that an urn contains 3 green marbles, 11 black marbles, and 6 yellow marbles. If one marble is selected, determine the probability that it is black. Here is my solution: 3 + 11 + 6 = 20 black marbles = 11 answer: 11/20.1 solutions Answer 206477 by richwmiller(9132)   on 2010-03-23 20:47:06 (Show Source): You can put this solution on YOUR website!By George I think you have got it!
 Travel_Word_Problems/284605: How many hours will it take Bob to travel 150 miles at a speed of 75 miles per hour? 1 solutions Answer 206476 by richwmiller(9132)   on 2010-03-23 20:45:41 (Show Source): You can put this solution on YOUR website!How far will he go in one hour at that speed? So you have two numbers; what do you think you should do with them?
 Graphs/284586: Graph equation by determining the missing values needed to plot the ordered pairs y+x=4; (3, ), (4, ), (1, )1 solutions Answer 206475 by richwmiller(9132)   on 2010-03-23 20:43:29 (Show Source): You can put this solution on YOUR website!plug 3 in for x and find y plug 4 in for x and find y plug 1 in for x and find y you actually only need two points to find your line so the third point is to check that you did all three correctly.
 Graphs/284623: 1 solutions Answer 206473 by richwmiller(9132)   on 2010-03-23 20:40:04 (Show Source): You can put this solution on YOUR website!Sorry but you already asked a similar question.
 Graphs/284625: Please Help Me; The Directions are to write an equation for the linear function f with the given values. f(0)= -1, F(3)= -10 Please Help Me, Thank You So Much, ♥1 solutions Answer 206472 by richwmiller(9132)   on 2010-03-23 20:38:31 (Show Source): You can put this solution on YOUR website!Think of it as (0,-1) x=0 y=-1 (3,-10) x=3 y=-10 Use those points to write the equation for a line.
 Linear_Equations_And_Systems_Word_Problems/284582: Your teacher is giving a test worth 200 points. There is a total of 30 five-point and ten-point questions. How many five-point questions are on the test?1 solutions Answer 206471 by richwmiller(9132)   on 2010-03-23 20:35:28 (Show Source): You can put this solution on YOUR website!a+b=30 5a+10b=200 a=20 b=10 There are 20 five pointers and 10 ten pointers. 100 points of five pointers and 100 points of ten pointers
 Volume/284596: Find the height of a cylinder with a radius of 8.4 inches and a volume of 3546.7in <-(that number has a little three above it) Round to the nearest tenth1 solutions Answer 206469 by richwmiller(9132)   on 2010-03-23 20:30:04 (Show Source): You can put this solution on YOUR website!in is not a number. It is an abbreviation for inches. The little three means cubic inches because we are dealing with volume.
 Pythagorean-theorem/284620: how can the formula of Pythagorean theorem help me solve this problem? a^2+b^2=c^2 8^2+b^2=10^21 solutions Answer 206468 by richwmiller(9132)   on 2010-03-23 20:26:28 (Show Source): You can put this solution on YOUR website!It can't help you. It is just an equation. You have to do the work which is applying the Pythagorean formula to find b which is one of the sides of the right triangle.
 Rate-of-work-word-problems/284590: John can type 2/3 of a manuscript in 12 hours. If Laura and John work together, they can type the entire manuscript in 2 hours. If Laura worked alone, how long would it take her to type the manuscript?1 solutions Answer 206467 by richwmiller(9132)   on 2010-03-23 20:18:08 (Show Source): You can put this solution on YOUR website!John is obviously not much of a typist and should just hire Laura to do it. John will take 18 hours to type the thing by himself. 2/18+2/L=1 2L+36=18L 36=16L 9=4L 9/4=L 2 1/4=L 2.25=L 1/9+2/2.25=1 1/9+8/9=1 Laura does 8/9 of the work and John does 1/9 and most of his is probably errors. Laura can do it alone in 2 hours 15 minutes.
 Graphs/284598: 2x-y=1 y=-x+5 do you solve this1 solutions Answer 206462 by richwmiller(9132)   on 2010-03-23 20:10:25 (Show Source): You can put this solution on YOUR website!This is a lesson in learning how to word your question correctly. No, I do not solve this.
 Linear_Equations_And_Systems_Word_Problems/284543: Solve the problem. After two years on the job, an engineer's salary was \$45,000. After seven years on the job, her salary was \$60,000. Let y represent her salary after x years on the job. Assuming that the change in her salary over time can be approximated by a straight line, give an equation for this line in the form y = mx + b. 1 solutions Answer 206441 by richwmiller(9132)   on 2010-03-23 18:24:06 (Show Source): You can put this solution on YOUR website!so you have two points (2,45) or (2, 45000) and (7,60) or (7,60000) make an equation from those two points
 Percentage-and-ratio-word-problems/284538: Hello! I would really like if you could help me with this problem. We have to turn 34/42 into a decimal then into a percent. I tried to multiply 42(the denominator) till i got 100, but 42 doesn't go into 100 so i tried multiplying till i got a number that can go into 200 300 400... but 42 doesn't go into those numbers either. Can you help? thanks for reading this -S 1 solutions Answer 206439 by richwmiller(9132)   on 2010-03-23 18:18:30 (Show Source): You can put this solution on YOUR website!to get the decimal you divide 42 into 34 and no it doesn't go evenly you could reduce 34/42=17/21 to make it a little easier (but not much) to divide 21 into 17 then take that decimal and multiply it by 100 to get percent. it should be at least .xxx places
 Linear-equations/284532: this is a question in my 8th grade Pre algebra class that i don't understand: If an athlete runs 1 mile in 6 minutes, 2 miles in 12 minutes, and 3 miles in 18 minutes. Does the athlete run at a linear rate? Explain your reasoning.1 solutions Answer 206437 by richwmiller(9132)   on 2010-03-23 18:13:14 (Show Source): You can put this solution on YOUR website!first you have to understand what linear rate means. Linear means it make a line. If you plot (1,6) (2,12) (3,18) will it make a line. Try it. the formula for a line is y=mx+b in this case b=0 and m =6 y=6x try them 6=6*1 12=6*2 18=6*3 so yes it is linear
 Polynomials-and-rational-expressions/284234: Divide and, if possibly, simplify. (x^2- 2x-8)/(x^2- 9) ÷ (x-4)/(x+3) The answer is one of the following: ((x+4)(x-2)(x+3))/(x-4) (x+2)/(x-3) I believe it is this one... (x+3)^2/(x+2) (x+3)/(x+2)1 solutions Answer 206388 by richwmiller(9132)   on 2010-03-23 13:15:20 (Show Source): You can put this solution on YOUR website!Why do you believe it is that one?
 Graphs/284392: identify the ordered pair for -2x+5y=-5 a)(-5,3) b)(-4,3/5) c)(0,-1) d) (-1,0)1 solutions Answer 206386 by richwmiller(9132)   on 2010-03-23 13:05:36 (Show Source): You can put this solution on YOUR website!plug in the x and see if the same y appears Don't be so lazy!
 Money_Word_Problems/284400: The revenue achieved by selling x graphing calculators is figured to be x(32-0.2x) dollars. The cost of each calculator is \$16. How many graphing calculators must be sold to make a profit (revenue - cost) of at least \$307.20?1 solutions Answer 206385 by richwmiller(9132)   on 2010-03-23 12:59:09 (Show Source): You can put this solution on YOUR website!revenue-cost=profit x(32-.2x)-16x=307.20 x=32 and 48 the max will be at 40 There is obviously something wrong with the formula if the same profit is made at 32 and 48 pieces
 Functions/284399: if f(x)=X^2 and g(x)=3X-4, find (fog). The solution is shown as this 9x^2-24x+16. I just can't figure out where the 24x comes from??? I understand where everything else comes from except the 24x! lol.1 solutions Answer 206383 by richwmiller(9132)   on 2010-03-23 12:50:17 (Show Source): You can put this solution on YOUR website!-24x came from the same place the rest of it came from. Where do you think the rest of it came from?
 Graphs/284398: using the slope formula how do i solve for (-1,3)and(16,27)1 solutions Answer 206382 by richwmiller(9132)   on 2010-03-23 12:47:16 (Show Source): You can put this solution on YOUR website!Equations are solved. Points are plotted. What do you want? I can guess but I am not going to. Part of learning math is learning to ask the right questions.
 Rectangles/284331: The area of a square exceeds the area of a rectangle by 4 square inches. The width of a rectangle is 5 inches and the length is 4 inches longer than the side of the square. Find the side of the square.1 solutions Answer 206381 by richwmiller(9132)   on 2010-03-23 12:44:44 (Show Source): You can put this solution on YOUR website!s^2=L*w+4 w=5 L=s+4 L = 12, s = 8, w = 5 check 64=(5*12)+4 L=8+4 ok