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Recent problems solved by 'edjones'

edjones answered: 7568 problems
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Numeric_Fractions/223758: how do you solve 8u-2=7u-4 ? 1 solutions Answer 167244 by edjones(7569)   on 2009-10-08 14:39:35 (Show Source): You can put this solution on YOUR website! 8u-2=7u-4 u=-2 add -7u+2 to each side. . Ed

Surface-area/223750: 631CM= 1 solutions Answer 167239 by edjones(7569)   on 2009-10-08 14:27:47 (Show Source): You can put this solution on YOUR website! 6.31 m

Equations/223749: Please help me solve this equation: 1 solutions Answer 167238 by edjones(7569)   on 2009-10-08 14:26:21 (Show Source): You can put this solution on YOUR website! 2x^2-5x+3=0 2*3=6 what 2 factors of 6 add up to -5? -2 and -3 2x^2-2x-3x+3=0 2x(x-1)-3(x-1)=0 (2x-3)(x-1)=0 . 2x-3=0 2x=3 x=3/2 . x-1=0 x=1 . Ed

Numbers_Word_Problems/223738: what is the last non zero digit of 96!? 1 solutions Answer 167223 by edjones(7569)   on 2009-10-08 13:45:00 (Show Source): You can put this solution on YOUR website! one

logarithm/222938: logx= log9^3/2 1 solutions Answer 166810 by edjones(7569)   on 2009-10-07 01:32:10 (Show Source): You can put this solution on YOUR website! log(x)= log(9^(3/2)) x=9^(3/2) x=27 . Ed

Quadratic_Equations/222934: Ive got to solve these problems using Quadratic Equation, but obviously I cant. Help me out, thanks! a) The product of the second and third consecutive integers is 7 more than the first. Find the numbers. b) If the area of the triangle is 240 square meters and one leg is 8 more than the other leg, find the (sorry, n/a. please fill in)? 1 solutions Answer 166809 by edjones(7569)   on 2009-10-07 01:26:39 (Show Source): You can put this solution on YOUR website! Let the numbers be x, x+1 and x+2. (x+1)(x+2)=x+7 x^2+3x+2=x+7 x^2+2x-5=0 There is no answer because x is not an integer. . Ed

Circles/222731: Hannah wants to plant strawberries in a circular plot covering an area of 15 sq meters - write an equation you can use to find the radius 1 solutions Answer 166808 by edjones(7569)   on 2009-10-07 01:14:18 (Show Source): You can put this solution on YOUR website! A=pi*r^2 pi*r^2=15 r^2=15/pi r=sqrt(15/pi) . Ed

Numbers_Word_Problems/222733: The sum of the digits of a four-digit number is 27. If the ten's digit and the unit's digit are reversed, the resulting number exceeds the original number by 45. What is the LARGEST possible value for the original four-digit number? Explain your answer. 1 solutions Answer 166807 by edjones(7569)   on 2009-10-07 01:09:57 (Show Source): You can put this solution on YOUR website! Let t=tens number and u=units number 10t+u=10u+t-45 9t=9u-45 t=u-5 for the last 2 numbers We want the first 2 numbers to be 99 if possible in order to have the largest number possible. So t+u=9 would be best. u-5+u=9 substitute u-5 for t 2u-5=9 2u=14 u=7 t=2 The number is 9927 . Ed

Graphs/222734: I need help getting: T/4 >(underlined) -1/4 And problems such as those. 1 solutions Answer 166806 by edjones(7569)   on 2009-10-07 00:42:14 (Show Source): You can put this solution on YOUR website! means "x is greater than or equal to 8" multiply each side by 4. . Ed

Angles/222735: How do i find the suppliment and compliment of angle 3x 1 solutions Answer 166805 by edjones(7569)   on 2009-10-07 00:35:36 (Show Source): You can put this solution on YOUR website! 90-3x is the compliment. 180-3x is the supplement. . Ed

Polynomials-and-rational-expressions/222753: 36x^2 > or equal to 25x 1 solutions Answer 166802 by edjones(7569)   on 2009-10-07 00:27:28 (Show Source): You can put this solution on YOUR website! 36x^2>=25x 36x>=25 divide each side by x. x>=25/36 . Ed

Rectangles/222761: the height of a triangle is 5 cm more than twice the length of its base.write an equation relating the height of the triangle 2 the length 1 solutions Answer 166799 by edjones(7569)   on 2009-10-07 00:18:45 (Show Source): You can put this solution on YOUR website! h=2b+5 where b=length of the base and h=height.

Travel_Word_Problems/222763: If joe drives 20mi in 1/2hr. how long will it take him to drive 50mi? 1 solutions Answer 166798 by edjones(7569)   on 2009-10-07 00:15:09 (Show Source): You can put this solution on YOUR website! He drives 40 mi/hr 40t=50 (st=d Where d=dist, t=time, s=speed) t=5/4 hr . Ed

Linear-systems/222765: 3(x+3)-6x-8=-4 1 solutions Answer 166796 by edjones(7569)   on 2009-10-07 00:10:23 (Show Source): You can put this solution on YOUR website! 3(x+3)-6x-8=-4 3x+9-6x-8=-4 -3x+1=-4 -3x=-5 x=5/3 . Ed

Travel_Word_Problems/222780: A jet plane traveling at 500 mph overtakes a propeller plane traveling at 200 mph that had a 2-hour head start. How far from the starting point are the planes? 1 solutions Answer 166795 by edjones(7569)   on 2009-10-07 00:03:57 (Show Source): You can put this solution on YOUR website! d=st Where d=distance, t=time, s=speed d is the same for both planes. 500t=200(t+2) head start of 2 hr=t+2 500t=200t+400 300t=400 t=4/3 hr 500 * 4/3 = 2000/3 =666.67 mi . Ed

Miscellaneous_Word_Problems/222916: the perimeter of a trangle is 136cm. if the three sides of the trangle are (x + 7)cm, (2x - 5)cm, and (3x + 2)cm, what is the lenght of each side? 1 solutions Answer 166793 by edjones(7569)   on 2009-10-06 23:51:53 (Show Source): You can put this solution on YOUR website! x+7+2x-5+3x+2=136 6x+4=136 6x=132 x=22cm 29, 39 and 68 are the 3 sides . Ed

Quadratic_Equations/220887: I don't understand how to use the formula of ax^+bx+c=0 My problem is this x^2+7x=180 I need x answered 1 solutions Answer 165738 by edjones(7569)   on 2009-10-03 01:02:24 (Show Source): You can put this solution on YOUR website! x^2+7x=180 x^2+7x-180=0 a=1, b=7, c=-180 . Ed . Solved by pluggable solver: SOLVE quadratic equation with variable Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=769 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 10.365424623862, -17.365424623862. Here's your graph:

Expressions-with-variables/220886: 49 more than some number 1 solutions Answer 165736 by edjones(7569)   on 2009-10-03 00:50:08 (Show Source): You can put this solution on YOUR website! x+49

Signed-numbers/220889: What is (x+5y) + (x-y) 1 solutions Answer 165735 by edjones(7569)   on 2009-10-03 00:49:17 (Show Source): You can put this solution on YOUR website! x+x=2x 5y-y=4y 2x+4y Answer. . Ed

Polynomials-and-rational-expressions/220909: 3. Combine like terms, and write in descending order: 3/4 x^3+4x^2-x^3+7 now ive tryed this so far but not sure if right please help me 3/4x, 3/4x, 3/4x = 21/64x 4x, 4x = 16x x, x, x =x^3 7 = 7 16x + 7 + 21/64x + x^3 is this correct? 1 solutions Answer 165733 by edjones(7569)   on 2009-10-03 00:40:49 (Show Source): You can put this solution on YOUR website! (3/4)x^3+4x^2-x^3+7 =3x^3/4 +4x^2-x^3+7 =-x^3/4 +4x^2+7 [(-4x^3/4) - (3x^3/4) = (-x^3/4)] . Ed

Exponents-negative-and-fractional/220918: what is 2/3 to the negative 3 power 1 solutions Answer 165731 by edjones(7569)   on 2009-10-03 00:33:17 (Show Source): You can put this solution on YOUR website! (2/3)^-3 =(3/2)^3 =27/8 . Ed

Percentage-and-ratio-word-problems/220905: The ratio of onions to radishes in a tossed salad is 8 to 5. If the number of onions is decreased by 20 percent and the number of radishes is increased by 20 percent what is the new ratio of onions? Express answer in a common fraction. 1 solutions Answer 165717 by edjones(7569)   on 2009-10-02 23:22:11 (Show Source): You can put this solution on YOUR website! (8-(8*.2))/(5+(5*.2)) =(8-1.6)/(5+1) =6.4/6 =32/30 multiply by 5/5 =16/15 . Ed

Percentage-and-ratio-word-problems/220906: Given that 1/8 of a number is 1/5, what is 5/8 of a number? 1 solutions Answer 165714 by edjones(7569)   on 2009-10-02 23:04:54 (Show Source): You can put this solution on YOUR website! Let the number be x. x/8=1/5 x=8/5 Multiply each side by 8. 5/8 * 8/5 = 1 . Ed

Angles/214266: If three times the supplement of an angle is subtracted from seven times the complement of the angle, the answer is the same as that obtained by trisecting a right angle. Find the supplement. 1 solutions Answer 162068 by edjones(7569)   on 2009-09-18 01:08:14 (Show Source): You can put this solution on YOUR website! Let a=the angle trisecting a right angle=90/3=30 compliment=90-a supplement=180-a . 7(90-a)-3(180-a)=30 630-7a-540+3a=30 90-4a=30 -4a=-60 a=15 degrees. . Ed

Word_Problems_With_Coins/214267: Todd has 48 words to spell for a puzzle. His mother says she will pay him $1.00 for every word he spells correctly but he has to pay her $0.60 for every word he spells incorrectly. If Todd makes $19.20, how many words did he spell correctly? Define the variable, create the equation, and solve. 1 solutions Answer 162067 by edjones(7569)   on 2009-09-18 00:58:13 (Show Source): You can put this solution on YOUR website! Let c=number of words spelled correctly and 48-c=number of words spelled incorrectly. c-.6(48-c)=19.2 c-28.8+.6c=19.2 1.6c=48 c=30 words spelled correctly. . Ed

Graphs/214270: Okay so I have 2 questions. my first one is, how do you figure out the function of a graph that is not linear besides plugging in values for x? My second one is, how do you figure out what the end behavior of a graph is?? and what is an asymtope? 1 solutions Answer 162066 by edjones(7569)   on 2009-09-18 00:49:42 (Show Source): You can put this solution on YOUR website! 1) You have to plug them in or use a graphing calculator. . 2) Asymptote= a straight line that is closely approached but never touched by a curve. Take 1/(x+1) for example (the graph below). X can never be -1 (the vertical asymptote) because division by zero is not allowed. The end behavior of the function as x becomes very large (or very small) is that the lines get very close to the horizontal asymptote but never touch it. Note that there is a horizontal asymptote at y=0 also. . Ed . .

Functions/214276: This question is from textbook Algebra and Trigonometry Structure and Method Give the domain of the function 1 solutions Answer 162064 by edjones(7569)   on 2009-09-18 00:22:06 (Show Source): You can put this solution on YOUR website! Sqrt of a negative number cannot b e used. 2x-1<0 2x<1 x<1/2 X[1/2, infinity) Domain . Ed

Expressions-with-variables/214311: the product of 33 and j 1 solutions Answer 162062 by edjones(7569)   on 2009-09-18 00:16:53 (Show Source): You can put this solution on YOUR website! 33j

Rational-functions/214410: (x/x^2-4)-1(x+2)=2 1 solutions Answer 162061 by edjones(7569)   on 2009-09-18 00:12:32 (Show Source): You can put this solution on YOUR website! (x/(x^2-4))-1/(x+2)=2 Assuming that this is the problem. x/((x+2)(x-2)) - 1/(x+2)=2 x-(x-2)=2(x^2-4) multiply each side by (x-2)(x+2) x-x+2=2x^2-8 2x^2-10=0 2(x^2-5)=0 x^2=5 x=sqrt(5), x=-sqrt(5) . Ed

test/214603: Element QX has 3 naturally occurring isotopes. QX-18 occurs 72.03% of the time, Qx-17 occurs 22.94% of the time and Q-16 occurs 5.03% of the time. What is the average atomic mass number that would be reported on the periodic table? thank you 1 solutions Answer 162060 by edjones(7569)   on 2009-09-18 00:00:13 (Show Source): You can put this solution on YOUR website! 18*.7203 + 17*.2294 + 16*.0503 =17.67 . Ed

Rational-functions/214606: Solve the equation for x. Round to two decimal places. Please Show your work. 1. log[4](x)=3 2. In x=-2.5 3. 2*log[3](x)+4=1 4. 10*log(2x)=30 1 solutions Answer 162059 by edjones(7569)   on 2009-09-17 23:56:29 (Show Source): You can put this solution on YOUR website! log[4](x)=3 4^log[4](x)=4^3 x=64 . Ed