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Recent problems solved by 'richwmiller'

richwmiller answered: 9124 problems
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Polynomials-and-rational-expressions/285916: please help me solve this equation : x+2x/x-2=3x-2/x-2 . I figured out that the LCD is x-2, but I don't know what to do from here 1 solutions Answer 207320 by richwmiller(9135)   on 2010-03-27 16:32:26 (Show Source): You can put this solution on YOUR website! WOW That must have taken you all of 0 seconds to figure out. Why were you looking for an LCD ? Why don't you multiply both sides by the LCD it took so long to find?

Linear_Equations_And_Systems_Word_Problems/285877: Aldo runs 4 miles in 30 minutes. At the same rate, how many miles would he run in 48 minutes. 1 solutions Answer 207319 by richwmiller(9135)   on 2010-03-27 16:27:50 (Show Source): You can put this solution on YOUR website! 4/30=x/48 30x=4*48 x=4*48/30 x=96/15 x=6.4

real-numbers/285883: Is the number 4.9 a rational or irrational? 1 solutions Answer 207318 by richwmiller(9135)   on 2010-03-27 16:22:47 (Show Source): You can put this solution on YOUR website! A rational number can be expressed as a ratio 49/10

Evaluation_Word_Problems/285898: Two in-line skaters, Nell and Kristin, strat from the smae point and smae direction. Nell skates at 12 miles per hour and kirstin and 14 mile per hour. If they can up that pace for 4.5 hours, how far apart will they be at the end of that time? 1 solutions Answer 207317 by richwmiller(9135)   on 2010-03-27 16:17:28 (Show Source): You can put this solution on YOUR website! It si vrey hrad to rade yoru porblem woiht os mnay speelnig erorrs. Taek mroe crae if yuo wnat phel. strat smae and smae " if they can up that pace"????? They are going apart at the rate of 2 mph for 4.5 hours

Age_Word_Problems/285783: Each year on Colin’s birthday (since his first birthday), he celebrates with a birthday cake and the number of candles on the cake is always equal to his age. If he has had a total of 253 candles on his birthday cakes, how old is he? A.22 B. 20 C. 24 D. 19 E. None of these. 1 solutions Answer 207309 by richwmiller(9135)   on 2010-03-27 16:09:19 (Show Source): You can put this solution on YOUR website! 253=n*(n+1)/2 506=n*(n+1) n=22 A. 22 1+2+3+4+ 19+20+21+22=253

Triangles/285903: I have a triangle with side a being 75 feet, side b being 50 feet and side c being 20 feet. I need to find angle C, but I think it is impossible. Is this triangle impossible, and if it is why? 1 solutions Answer 207303 by richwmiller(9135)   on 2010-03-27 15:56:01 (Show Source): You can put this solution on YOUR website! Why do you think it is impossible? Do you think it is impossible to find the angle? or that the triangle itself is impossible? Why?

test/285905: Let f be the function given by f(x)=x^3-6x^2. The graph is concave up when (A) x > 2 (B) x < 2 (C) 0 < x < 4 (D) x < 0 or x > 4 only (E) x > 6 only 1 solutions Answer 207302 by richwmiller(9135)   on 2010-03-27 15:52:16 (Show Source): You can put this solution on YOUR website! it curves up when x>2

Linear-equations/285866: Factor 25y^2 - 9 1 solutions Answer 207289 by richwmiller(9135)   on 2010-03-27 13:02:11 (Show Source): You can put this solution on YOUR website! (5y-3)*(5y+3)

Geometry_proofs/285846: Given: 0 is the midpoint of line segment MQ. 0 is the midpoint of line segment NP. Prove: triangle MON is congruent to triangle QOP statements: Reasons. 1. O is the midpoint of line segment MQ. 1. _______________________ 2._________________ 2. Definition of Midpoint. 3._________________ 3. given 4._________________ 4. Definition of Midpoint. 5. angle MON is congruent to angle QOP 5. _______________________ 6. triangle MON is congruent to triangle QOP. 6. _______________________ i have too find the blanks and idk how. 1 solutions Answer 207285 by richwmiller(9135)   on 2010-03-27 12:49:21 (Show Source): You can put this solution on YOUR website! Given: 0 is the midpoint of line segment MQ. 0 is the midpoint of line segment NP. Prove: triangle MON is congruent to triangle QOP It is best to draw the figures to visualize it. statements: Reasons. 1. O is the midpoint of line segment MQ. 1. ___given____________________ 2.___________MO=MQ______ 2. Definition of Midpoint. 3. 0 is the midpoint of line segment NP. 3. given 4.____________NO=OP 4. Definition of Midpoint. 5. angle MON is congruent to angle QOP 5.intersecting lines form congruent angles 6. triangle MON is congruent to triangle QOP. 6. two sides and the angle between them are congruent start with the given we are told under given two things one was used in #1 and #3 what does midpoint mean? #2 and #4 the line MQ and line NP intersect and form congruent angles mon and poq

Miscellaneous_Word_Problems/284723: A rock and a half rock weigh a pound and a half. The rock and the half rock weigh the same. How much would half the whole rock and the whole of the half rock weigh? a 2 1/2 b 1 1/8 c 1 7/2 d 2 1/4 e None of these. 1 solutions Answer 207284 by richwmiller(9135)   on 2010-03-27 12:38:09 (Show Source): You can put this solution on YOUR website! let x= whole rock y/2=half rock x+y/2=1.5=3/2 we are told that the whole rock and the half rock weight the same x=y/2 x=3/2*1/2=3/4 y/2=3/4 y=6/4=3/2 half the whole rock =3/8 the whole of half rock =3/4 3/8+3/4= 3/8+6/8= 9/8= 1 1/8 answer b 1 1/8 we are not adding half of the whole rock but removing it. we are removing 3/8 so instead of 3/4+3/4 we have 3/8 +3/4

Inverses/285841: when you have 20=5f+15 what would you do to get the 5f onto the other side of the = sign? Would it be a positive or a negative? 1 solutions Answer 207277 by richwmiller(9135)   on 2010-03-27 11:57:44 (Show Source): You can put this solution on YOUR website! don't know why you want to do that 20=5f+15 subtract 15 from both sides 5=5f 1=f but anyways 20=5f+15 20-5f+15 -5f=-5 f=1 negative you subtract 5f from both sides you want 0 instead of 5f so you have to subtract if you added 5f you get 20+5f=5f+5f+15 20+5f=10f+15

Miscellaneous_Word_Problems/285797: Find the measures of the angles of a triangle if the measure of the 1st triangle is twice the measure of the second angle and the third angle is 36 degrees more than the second angle. 1 solutions Answer 207276 by richwmiller(9135)   on 2010-03-27 11:53:26 (Show Source): You can put this solution on YOUR website! i assume that there is a typo and that it should read" Find the measures of the angles of a triangle if the measure of the 1st "angle" is twice the measure of the second angle and the third angle is 36 degrees more than the second angle. a, b and c where a=2b c=36+b so we have a+b+c=180 by substitution 2b+b+36+b=180 4b+36=180 4b=144 4b=4*3*12 b=36 a=72 c=72

Linear-equations/285776: Find the slope and y-intercept for each x + 2y = 3 1 solutions Answer 207271 by richwmiller(9135)   on 2010-03-27 11:39:49 (Show Source): You can put this solution on YOUR website! the slope is -a/b=-1/2 y intercept is when x=0 2y=3 y=3/2=1 1/2

expressions/285836: Write the point-slope form of the equation of the line described. through: (-4,-1), parallel to y=-1/2x-1 1 solutions Answer 207268 by richwmiller(9135)   on 2010-03-27 11:35:58 (Show Source): You can put this solution on YOUR website! wrong category It is hard to find lessons and examples if you are in the wrong category! There is no such thing as a point-slope form of the equation of the line. there is a slope intercept form and standard form you might use a point slope formula to find one.

Miscellaneous_Word_Problems/285800: An archer has $191 to spend on a new archery set. A certain set containing a bow and three arrows costs $61. With the purchase of this set he can purchase additional arrows for $10 per arrow. Use an inequality to find the maximum number of arrows he could obtain, including those with the set for his $191. 1 solutions Answer 207257 by richwmiller(9135)   on 2010-03-27 11:10:17 (Show Source): You can put this solution on YOUR website! 191<=61+10a 130<=10a 13<=a 13+ the 3 with the set =16

Radicals/285828: x=Radical 200-35x 1 solutions Answer 207254 by richwmiller(9135)   on 2010-03-27 11:06:23 (Show Source): You can put this solution on YOUR website! x^2=200-35x x^2+35x-200=0 what are factors of 200 with a difference or sum of 35 5 and 40 (x-5)*(x+40)=0 x=5 x=-40

Probability-and-statistics/285778: The problem in statistics is given to two students A and B whose chances of solving it are 1/3 and 1/4.What is the probability that the problem will be solved? 1 solutions Answer 207251 by richwmiller(9135)   on 2010-03-27 11:03:14 (Show Source): You can put this solution on YOUR website! It is either 1/3*1/4=1/12 or 1/3+1/4=4/12+3/12=7/12

Quadratic_Equations/285804: x²-2k(x+3)=6x+3 has equal roots 1 solutions Answer 207249 by richwmiller(9135)   on 2010-03-27 10:59:39 (Show Source): You can put this solution on YOUR website! Do you want something? Perhaps have a question?

expressions/285815: Write the point-slope form of the equation of the line described through: (-3,-3), parallel to y=7/3x+3 1 solutions Answer 207242 by richwmiller(9135)   on 2010-03-27 10:29:35 (Show Source): You can put this solution on YOUR website! you couldn't find the slope category?

Geometry_Word_Problems/285817: the sum of two numbers is twenty five the total of four times the smaller number and two is six less than the product of two and the number. Find two numbers 1 solutions Answer 207241 by richwmiller(9135)   on 2010-03-27 10:28:05 (Show Source): You can put this solution on YOUR website! Please connect this to geometry?

Triangles/285819: I have a geometry question I need help with it is as follows: A triangle has the following sides: 12 feet, 20 feet, and 16 feet. Is this a right triangle? Explain your answer. 1 solutions Answer 207239 by richwmiller(9135)   on 2010-03-27 10:26:57 (Show Source): You can put this solution on YOUR website! let's put them in order of size 12,16,20 divide by 4 3,4,5 yes it is the classic 3,4,5 right triangle What is another way using the Pythagorean theorem ? the largest side will be the hypotenuse 12^2+16^2=20^2 144+16^2=400 Does 16^2=256? if so then it is a right triangle.

Miscellaneous_Word_Problems/285814: A company manufactures bicycles and skateboards. The company's daily production of bicycles cannot exceed 10, and its daily production of skateboards must be less than or equal to 12. The combined number of bicycles and skateboards cannot be more than 16. If x is the number of bicycles and y is the number of skateboards, graph on the accompanying set of axes the region that contains the number of bicycles and skateboards the company can manufacture daily. I tried to do this question several times but keep getting stuck on the 10 and 12. I cant make another inequality for it. 1 solutions Answer 207235 by richwmiller(9135)   on 2010-03-27 10:23:05 (Show Source): You can put this solution on YOUR website! x<=10 y<=12 x+y<=16 There is no question. It tells you to graph it! What/where are the accompanying set of axes? x y x+y 1 1 2 1 2 3 1 3 4 As you can see there are many possibilities for x and y You cannot find a unique solution for x and y. If you want to know the possible values of x and y when x+y=16 remember the max for y=12 the max for x=10 4 12 16 5 11 16 6 10 16 7 9 16 8 8 16 9 7 16 10 6 16 but the only "question" is to graph the inequalities. also remember that x+y doesn't have to be 16

Geometry_proofs/285807: Prove that in any triangle ABC the length x of the median from C is given by: I know it has to do with the law of cosines: but I'm not sure how to simplify it to this other equation. 1 solutions Answer 207231 by richwmiller(9135)   on 2010-03-27 10:10:33 (Show Source): You can put this solution on YOUR website! x=(1/2)sqrt(2a^2+b^2-c^2) 2x=sqrt(2a^2+2b^2-c^2) 4x^2= (2a^2+2b^2-c^2) x^2= (2a^2+2b^2-c^2)/4 x^2=(a^2+b^2-c^2)/2 so to be equal x^2 must be ab can you take it from here?

Linear_Equations_And_Systems_Word_Problems/285809: what value is y if 5y-8 is twice as big as 3y+5 1 solutions Answer 207228 by richwmiller(9135)   on 2010-03-27 09:57:47 (Show Source): You can put this solution on YOUR website! [example 10 is twice as big as 5 so 10=2*5] 5y-8=2*(3y+5) 5y-8=6y+10 -18=y

Linear_Equations_And_Systems_Word_Problems/285810: A BOAT TRAVELED 336 miles downstream and back. The trip downstream took 12 hours. The trip back took 14 hours. What is the speed of the boat in still water? what is the speed of the current? 1 solutions Answer 207225 by richwmiller(9135)   on 2010-03-27 09:52:50 (Show Source): You can put this solution on YOUR website! (r+c)*12=336 (r-c)*14=336 divide both by 2 (r+c)*6=168 (r-c)*7=168 (r+c)*6=(r-c)*7 6r+6c=7r-7c 13c=r substitute 13c for r in equation one 14c*12=336 7c*12=168 7c*6=84 42c=84 c=2 r=26

Problems-with-consecutive-odd-even-integers/285727: One number is 1 more than 3 times another.Their sum is 21. What is their product? 1 solutions Answer 207192 by richwmiller(9135)   on 2010-03-26 22:25:25 (Show Source): You can put this solution on YOUR website! Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting?

Polynomials-and-rational-expressions/285568: (3a-2) = (a+25)/(a+1) The solution is______ (simplify the answer use a comma to separate the answers). 1 solutions Answer 207191 by richwmiller(9135)   on 2010-03-26 22:24:51 (Show Source): You can put this solution on YOUR website! Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting?

Systems-of-equations/285726: 9x-6y=30 6y-9x=-30 1 solutions Answer 207190 by richwmiller(9135)   on 2010-03-26 22:23:15 (Show Source): You can put this solution on YOUR website! Isn't this a system of linear equations? Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting?

Functions/285570: x^2+y ^2+ 4x + 6y - 12 = 0 the problem is asking me to find the domain 1 solutions Answer 207189 by richwmiller(9135)   on 2010-03-26 22:20:40 (Show Source): You can put this solution on YOUR website! Then I recommend doing it. Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting?

Geometry_proofs/285600: Decide whether the argument is valid or invalid, and give the form (of valid or invalid argument) that applies. Select from Law of Detachment or Law of Syllogism. If it's Tuesday then this must be Paris. Today is Wednesday. ____________________ This must not be Paris. 1 solutions Answer 207188 by richwmiller(9135)   on 2010-03-26 22:19:19 (Show Source): You can put this solution on YOUR website! what part of geometry proofs is this? Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting?

Exponential-and-logarithmic-functions/285722: Hi, my question is actually regarding Evaluating and Graphing Polynomial Functions, but there was not option for that. My question is: Is f(x)=x^4(square root of 5)-x a function? 1 solutions Answer 207187 by richwmiller(9135)   on 2010-03-26 22:15:48 (Show Source): You can put this solution on YOUR website! Just curious. Had you looked for similar problems before posting? Had you looked for lessons before posting? What about the functions since you don't want to graph it.