Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On

 Tutoring Home For Students Tools for Tutors Our Tutors Register Recently Solved
 By Tutor
| By Problem Number |

Tutor:

# Recent problems solved by 'scott8148'

Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689 , 3690..3719 , 3720..3749 , 3750..3779 , 3780..3809 , 3810..3839 , 3840..3869 , 3870..3899 , 3900..3929 , 3930..3959 , 3960..3989 , 3990..4019 , 4020..4049 , 4050..4079 , 4080..4109 , 4110..4139 , 4140..4169 , 4170..4199 , 4200..4229 , 4230..4259 , 4260..4289 , 4290..4319 , 4320..4349 , 4350..4379 , 4380..4409 , 4410..4439 , 4440..4469 , 4470..4499 , 4500..4529 , 4530..4559 , 4560..4589 , 4590..4619 , 4620..4649 , 4650..4679 , 4680..4709 , 4710..4739 , 4740..4769 , 4770..4799 , 4800..4829 , 4830..4859 , 4860..4889 , 4890..4919 , 4920..4949 , 4950..4979 , 4980..5009 , 5010..5039 , 5040..5069 , 5070..5099 , 5100..5129 , 5130..5159 , 5160..5189 , 5190..5219 , 5220..5249 , 5250..5279 , 5280..5309 , 5310..5339 , 5340..5369 , 5370..5399 , 5400..5429 , 5430..5459 , 5460..5489 , 5490..5519 , 5520..5549 , 5550..5579 , 5580..5609 , 5610..5639 , 5640..5669 , 5670..5699 , 5700..5729 , 5730..5759 , 5760..5789 , 5790..5819 , 5820..5849 , 5850..5879 , 5880..5909 , 5910..5939 , 5940..5969 , 5970..5999 , 6000..6029 , 6030..6059 , 6060..6089 , 6090..6119 , 6120..6149 , 6150..6179 , 6180..6209 , 6210..6239 , 6240..6269 , 6270..6299 , 6300..6329 , 6330..6359 , 6360..6389 , 6390..6419 , 6420..6449 , 6450..6479 , 6480..6509 , 6510..6539 , 6540..6569 , 6570..6599 , 6600..6629, >>Next

 Matrices-and-determiminant/162512: Calculate the area of the triangle with the following vertices: (-8, -2), (-1, -11), and (-1, -2) I tried my best, and got an answer of 31.5 sq units. I just want to know if this is correct,and if not, see the steps to come to the correct answer and what it is. I thank you very much for your time!1 solutions Answer 119772 by scott8148(6628)   on 2008-10-16 16:28:10 (Show Source): You can put this solution on YOUR website!yes, you are correct
 Problems-with-consecutive-odd-even-integers/162520: The greater of two consecutive even integers is 6 less than three times the lesser. Find the integers. I only need the equation.1 solutions Answer 119770 by scott8148(6628)   on 2008-10-16 16:25:16 (Show Source): You can put this solution on YOUR website!let x=lesser, so x+2=greater "The greater of two consecutive even integers" __ x+2 "is" __ = "6 less than three times the lesser" __ 3x-6 x+2=3x-6
 logarithm/162469: Express as a single logarithm and simplify: 3 log 2 + log x – log (2x) If you could just show me an example of how to solve. Thanks, Anna 1 solutions Answer 119729 by scott8148(6628)   on 2008-10-16 12:03:22 (Show Source): You can put this solution on YOUR website!log[(2^3)x/2x] __ log(4)
 Travel_Word_Problems/162399: Two planes leave chicago one traving due east and the other due west. The first travels 100 miles per hour faster than the second. How long will it be until they are 2000 miles apart.1 solutions Answer 119728 by scott8148(6628)   on 2008-10-16 11:58:22 (Show Source): You can put this solution on YOUR website!not enough information
 Distributive-associative-commutative-properties/162387: A 5 digit number is represented by ABCDE where each letter is a digit. If we add the digit 1 in front of ABCDE we get 1ABCDE. The product 1ABCDE and 3 is the six digit number ABCDE1. Find the value of the original number ABCDE.1 solutions Answer 119727 by scott8148(6628)   on 2008-10-16 11:52:18 (Show Source): You can put this solution on YOUR website!3(ABCDE+100000)=10(ABCDE)+1 __ 3(ABCDE)+300000=10(ABCDE)+1 __ 299999=7(ABCDE) ABCDE=42857
 Polynomials-and-rational-expressions/162462: I need help factoring this problem: x^2 - 11xy + 24y^2 the ^ sign is meant to represent the power sign. Thank you (x-8y)(x-3y)1 solutions Answer 119720 by scott8148(6628)   on 2008-10-16 10:55:13 (Show Source): You can put this solution on YOUR website!factors of 24 that sum to -11 __ -3 and -8 (x-3y)(x-8y)
 Travel_Word_Problems/162377: This question is from textbook Algebra and Trigonometry please help me solve this word problem: On the first past of a 317-mile trip, a salesperson averaged 58 miles per hour. he averaged only 52 miles per hour on the last part of the trip because of an increased volume of traffic. the total time of the trip was 5 hours and 45 minutes. Find the amount of time at each of the two speed.1 solutions Answer 119667 by scott8148(6628)   on 2008-10-15 19:00:06 (Show Source): You can put this solution on YOUR website!let x="time @ 58mph", so 5.75-x="time @ 52mph" 58(x)+52(5.75-x)=317 __ 58x+299-52x=317 __ 6x=18 __ x=3 5.75-3=2.75 or 2hr 45min
 Numeric_Fractions/162348: Carlos had a bag of gum drops. He gave 1/4 of them to Monica, then gave half of what was left to Michael, then gave 1/6 of what was left to Ingrid. He then had 20 gumdrops left. How many did he have originally? I wasn't sure what topic this would go under, so i just clicked one that said fractions. I was thinking that i would try to work backward, but i just don't understand how.1 solutions Answer 119658 by scott8148(6628)   on 2008-10-15 18:39:26 (Show Source): You can put this solution on YOUR website!let x=gumdrops "He gave 1/4 of them to Monica" __ he kept 3/4 __ so 3x/4 "then gave half of what was left to Michael" __ he kept 1/2 __ 1/2 of 3x/4 is 3x/8 "then gave 1/6 of what was left to Ingrid" __ he kept 5/6 __ 5/6 of 3x/8 is 15x/48 "He then had 20 gumdrops left" __ 20=15x/48 __ 960=15x __ 64=x
 Quadratic-relations-and-conic-sections/162360: Classify the conic section of each equation. 13. 4x^2 + 3x = y^2 + 2y + 7 I know i need to make it look like... 4x^2 + 3x-y^2 - 2y - 7=0 but im not sure where to go next? Thank you for any help you may have!1 solutions Answer 119656 by scott8148(6628)   on 2008-10-15 18:28:38 (Show Source): You can put this solution on YOUR website!x and y both squared __ one coefficient negative this means hyperbola
 Quadratic-relations-and-conic-sections/162358: Classify the conic section of each equation 12. x^2 + 3y^2 = 3 I think this may be a parabola or an ellipse,but im not for sure, and i would love to see the way inwhich you can figure this out. Thank you so much!1 solutions Answer 119655 by scott8148(6628)   on 2008-10-15 18:25:54 (Show Source): You can put this solution on YOUR website!x and y both squared __ coefficients both positive but unequal (1 and 3) this means an ellipse
 Rate-of-work-word-problems/162357: PIPE A CAN FILL A POOL IN 12 HOURS. AFTER IT HAS BEEN USED FOR 4.5 HOURS. PIPE B IS ALSO USED; AND THE POOL IS FILLED IS ANOTHER 4.5 HOURS. HOW LONG WOULD IT TAKE FOR PIPE B TO FILL THE POOL BY ITSELF. PIPE A RATE 1/12 PIPE B RATE = Z PIPE A RUNS FOR T WHICH IS 4.5 + 4.5 = 9 PIPE B RUNS T - 4.5 T*R = w T(1/12) + T-4.5(1/Z)=1 9(1/12) + 9-4.5(1/Z)=1 9/12 + 4.5/Z =1 4.5/Z = 1-9/12 4.5/Z = 3/12 4.5/Z = 1/4 Z = 18 HRS WHERE DID GO WRONG? 1 solutions Answer 119654 by scott8148(6628)   on 2008-10-15 18:22:51 (Show Source): You can put this solution on YOUR website!you managed to "stumble" onto the correct answer you defined Z as the rate __ "PIPE B RATE = Z" __ but then used 1/Z in your calculations "T*R = w" "T(1/12) + T-4.5(1/Z)=1" "9(1/12) + 9-4.5(1/Z)=1"
 Travel_Word_Problems/161981: Please help. A cyclist traveled at a rate of 32 mph to visit a nearby town. The cyclist averaged 10 mph on the return trip. If the round trip took 6.3 hours, find the distance to the nearby town. [Fifteen points for the correct algebra equation and five points for solving the equation.1 solutions Answer 119406 by scott8148(6628)   on 2008-10-14 12:00:15 (Show Source): You can put this solution on YOUR website!time=distance/rate (d/32)+(d/10)=6.3 __ multiplying by 160 __ 5d+16d=1008 __ dividing by 21 __ d=48
 Quadratic-relations-and-conic-sections/162020: 11. What is the center of the ellipse whose equation is (x^2)/25 + (y^2)/4 = 1? A (25,1) B (5,1) C (4,25) D (4,1) E (0,0) F (5,2) (x-h)^2 / a^2 + (y-k)^2 / b^2 = 1 I tried to used this equation to help, but im really stuck. I appericaite any help you can offer. Thank you! 1 solutions Answer 119402 by scott8148(6628)   on 2008-10-14 11:50:50 (Show Source): You can put this solution on YOUR website!from the given equation, h and k are both zero __ a and b have nothing to do with the center E looks good...
 Quadratic-relations-and-conic-sections/162018: 7. What is the standard equation of the circle with radius 5, and center (-5,-1)? A (x-5)^2 + (y-1)^2 = 25 B (x+5)^2 + (y+1)^2 = 25 C (x+5)^2 + (y+5)^2 = 5 D A circle cannot have a center at (-5,-1). E (x-5)^2 - (y-1)^2 = 25 F (x+5)^2 - (y+1)^2 = 25 I used the formula for a circle and plugged the information in, and I got F for the right answer. But choice D is confusing me and i wanted to make sure F really is correct. Thank you!1 solutions Answer 119400 by scott8148(6628)   on 2008-10-14 11:47:02 (Show Source): You can put this solution on YOUR website!for a circle of radius r, centered at (h,k); the general equation is __ (x-h)^2 + (y-k)^2 = r^2 looks like B to me...
 Quadratic_Equations/162005: pls.help me solve the following quadratic equation by factoring: pls. submit your answer as soon as possible i need to pass it tomorrow im begging you pls..1 solutions Answer 119398 by scott8148(6628)   on 2008-10-14 11:41:49 (Show Source): You can put this solution on YOUR website!2x^2-3x+1=0 __ (2x-1)(x-1)=0 4x^2+9x=9 __ 4x^2+9x-9=0 __ (4x-3)(x+3)=0 2y^2+y=-11y __ 2y^2+12y=0 __ 2y(y+6)=0 y^2-7-44=0 __ y^2-51=0 __ (y+sqrt(51))(y-sqrt(51))=0 6x^2+11x-1=0 __ not factorable
 Geometry_Word_Problems/161947: A photo is 3 inches longer than it is wide. A 2-inch border is placed around the photo making the total area of the photo and border 108 square inches. What are the dimensions of the photo? I know the length and the width are are 12 and 9. I assume that I would subtract 2 from both of these in for the answer. I just don't know how to write it in the form of an equation. 1 solutions Answer 119338 by scott8148(6628)   on 2008-10-13 22:47:19 (Show Source): You can put this solution on YOUR website!actually, subtract 4 (2 at each end) dimensions of photo __ x and x+3 with border __ x+4 and x+7 (x+4)(x+7)=108 __ x^2+11x-80=0 __ factoring __ (x+16)(x-5)=0 x+16=0 __ x=-16 __ negative value not realistic x-5=0 __ x=5 __ substituting __ x+3=8
 Graphs/161909: This question is from textbook college algebra can somebody help me solve this problem. i need to find the equation of the line with these characteristics. I need to express my answer using either the general form or the slope-intercept form of the equation of the line. x-intercept=2; containing the point (4,-5) i forgot how to find the slope with only the, x-intercept = 2 given. 1 solutions Answer 119323 by scott8148(6628)   on 2008-10-13 21:42:14 (Show Source): You can put this solution on YOUR website!the x-intercept is (2,0) slope is (-5-0)/(4-2) __ m=-5/2 using point-slope __ y-0=(-5/2)(x-2) __ y=(-5/2)x+5
 Human-and-algebraic-language/161925: I seriously do not get this; i am suppose to translate this into a math equation. Twice the square of a number increased by five times the product of the number and three more than the number is the opposite of the quotient of six and the number. ??? Thank you for your time.1 solutions Answer 119317 by scott8148(6628)   on 2008-10-13 21:35:54 (Show Source): You can put this solution on YOUR website!"Twice the square of a number" __ 2n^2 "increased by" __ + "five times the product of the number and three more than the number" __ 5(n)(n+3) __ 5n^2+15n "is" __ = "the opposite of" __ - "the quotient of six and the number" __ 6/n 2n^2+5n^2+15n=-6/n
 Graphs/161918: Write the equation of the line passing through (-4,-2) and (-2,-6) This is what I did - m = -2/-4 (-2 over -4) - -6/-2 (-6 over -2) gives me -2/1 (-2 over 1) simplified it's -2. So m = -2 Then I used y = mx + b and plugged in the info as follows: -4 = -2(-4) + b -4 = 8 + b -8 -8 ---------- 4 = b So that would give me the answer of y = -2x + 4. Is this correct??1 solutions Answer 119315 by scott8148(6628)   on 2008-10-13 21:24:43 (Show Source): You can put this solution on YOUR website!your technique is good, and correct until you "plugged in" __ check your substitution and your equation solving ANSWER BELOW b should be -10
 Graphs/161922: Find the slope of any line perpendicular to the line through points (3,11) and (10,4). I keep coming up with undefined......Correct??1 solutions Answer 119312 by scott8148(6628)   on 2008-10-13 21:16:04 (Show Source): You can put this solution on YOUR website!no... the slope of the given line is (4-11)/(10-3) __ (-7)/(7)=-1 so a perpendicular line has a slope of 1(the negative reciprocal)
 Triangles/161851: angle a is 4 times greater than angle b and angle c is 20 degrees less than angle b... i have tried every possible whole number and even busted the equation down to as small as 64th increments.we have not yet studied hours,minutes,seconds.. so i figured it was not able to be figured out..could you please help... thank you..........sherry1 solutions Answer 119311 by scott8148(6628)   on 2008-10-13 21:10:51 (Show Source): You can put this solution on YOUR website!a+b+c=180 "angle a is 4 times greater than angle b" __ a=4b "angle c is 20 degrees less than angle b" __ c=b-20 substituting __ (4b)+b+(b-20)=180 __ 6b=200 __ b=100/3 substituting __ a=4(100/3) __ a=400/3 substituting __ c=(100/3)-20 __ c=40/3
 Expressions-with-variables/161875: please help me !! please and thanks 1/3(27x+18)=12+6(x-4) solve thank you 1 solutions Answer 119309 by scott8148(6628)   on 2008-10-13 21:02:01 (Show Source): You can put this solution on YOUR website!distributing __ 9x+6=12+6x-24 __ subtracting 6x+6 __ 3x=-18 __ dividing by 3 __ x=-6
 Polygons/161891: This question is from textbook 26) The sum of the measures of the interior angles of a polygon with n sides is S. Without using n in your answer, express in terms of S the sum of the measures of the angles of a polygon with: 2n sides. Answer by today would be greatly appreaciated! Thank you!1 solutions Answer 119306 by scott8148(6628)   on 2008-10-13 20:53:14 (Show Source): You can put this solution on YOUR website!S=n(180-(360/n)) __ S=180n(1-(2/n)) __ S=180(n-2) __ S=180n-360 S2=180(2n-2) __ S2=2(180n-180) __ S2=2(180n-360+180) __ substituting __ S2=2(S+180)
 Sequences-and-series/161818: This question is from textbook Algebra 1 Please can you help me with Arithmetic Sequences because I don't know how to do it. The problem say determine whether each sequence is an arithmetic sequence. If it is, state the common difference. The problem is -15,-11,-7,-3,.... Thanks for your help because I don't get how to do it so if you help me out to were I can do it on my own then thanks a lot.It's on page 236 my teacher wants me to do all the even numbers on the practice and apply. 1 solutions Answer 119232 by scott8148(6628)   on 2008-10-13 16:32:29 (Show Source): You can put this solution on YOUR website!a sequence is arithmetic if there is a COMMON difference __ if the difference between all the pairs of consecutive (next to each other) numbers is the same -15+4=-11 -11+4=-7 -7+4=-3 the common difference is 4
 Miscellaneous_Word_Problems/161771: I am working on a problem in algebra. The question is: A student opens a literature book to two facing pages. The product of the page numbers is 812. Find the page numbers. I would like to do this problem on my own, but I can't figure out the formula to do it. I have never taken algebra until now and it is driving me nuts. Any help would be appreciated. Thanks.1 solutions Answer 119225 by scott8148(6628)   on 2008-10-13 15:03:52 (Show Source): You can put this solution on YOUR website!here we go with the letter thing... if x is the number on the 1st page, then the number on the 2nd page is x+1 the product is x^2+x __ this equals 812 __ x^2+x=812 you are looking for two factors of 812 that are one number different __ the square root of 812 (on a calculator) is 28.5 (approx) so 28 and 29 are good bets
 Expressions-with-variables/161732: Hi,i am not sure if this is the right section, but here is my problem anyway. I am studying mechanics and i have been asked to do this for homework. Telegraph poles, 40m apart stand alongside a straigh railway line. The times taken for a locomotive to pass the two gaps between three consecutive poles are 2.5 seconds and 2.3 seconds, respectively. Assume that the acceleration of the train is constant. Calculate the acceleration of the train and the speed past the first post. Thanks in advance.1 solutions Answer 119217 by scott8148(6628)   on 2008-10-13 12:05:47 (Show Source): You can put this solution on YOUR website!average velocity is (initial velocity + final velocity)/2 __ it is also distance/time let V1=velocity @ 1st pole, V2=velocity @ 2nd pole, V3=velocity @ 3rd pole (V1+V2)/2=40/2.5 __ V1+V2=80/2.5=32 (V2+V3)/2=40/2.3 __ V2+V3=80/2.3=34.783 (V1+V3)/2=80/4.8 __ V1+V3=160/4.8=33.333 (V1+V2)+(V2+V3)-(V1+V3)=32+34.783-33.333 2(V2)=33.450 __ V2=16.725 V1=32-16.725 __ V1=15.275 m/s acceleration=(V2-V1)/2.5 __ a=.58 m/s^2
 Inequalities/161745: help! 7>5-x>61 solutions Answer 119199 by scott8148(6628)   on 2008-10-13 10:44:39 (Show Source): You can put this solution on YOUR website!subtracting 5 __ 2 > -x > 1 __ dividing by -1 __ -2 < x < -1
 Geometric_formulas/161749: My husband and I are building a semi-circular wall in our landscaping. We have 12x12 inch blocks that we need to cut in order to place them on top of the wall. If the radius of our semi-circle is 78 and 5/16 inches at what angle should we cut each of our blocks to form the semi-circle? 1 solutions Answer 119198 by scott8148(6628)   on 2008-10-13 10:37:38 (Show Source): You can put this solution on YOUR website!envision a long thin isosceles triangle, with a base of 12 inches and sides of 78 5/16 inches the cosine of the base angles is (12/2)/78 5/16 __ cos(x)=.07662 (approx) __ x=85.6º
 Mixture_Word_Problems/161672: Working on Chemistry homework. Could not understand this problem in class, still don't understand. "The density of an antifreeze soltuion measured .78g/ml. The solution was a mixture of 40% water and 60% antifreeze compound. How many g of antifreeze compound are necessary to prepare 80.0 mL of antifreeze solution?" I tried setting up my equation a couple different ways and I am sure I did not get the right answer. I got 104 g/Antifreeze. Please help me figure out how to set up this equation!1 solutions Answer 119164 by scott8148(6628)   on 2008-10-12 21:57:25 (Show Source): You can put this solution on YOUR website!total mass of solution is 80(.78) or 62.4g BY VOLUME 40% of 80 ml is 32 ml __ water is 1g/ml __ so 32g of water 62.4-32 or 30.4g of antifreeze BY WEIGHT 60% of 62.4 is 37.4g of antifreeze
 Travel_Word_Problems/161247: This question is from textbook Pre-algebra The product of a 2-digit number and 101 contains the digits of the 2-digit number repeated twice. For example 42 X 101 = 4242. What should you multiply a three-digit number by in order to have the product repeat the digits ?1 solutions Answer 118996 by scott8148(6628)   on 2008-10-11 17:31:22 (Show Source): You can put this solution on YOUR website!1001 __ the zeros give "room" for the digits to be multiplied without being disturbed
 Miscellaneous_Word_Problems/161274: the sum of the digit's of a three digit number is 14. If the hundred's and unit's are interchanged the resulting number is 594 more than original but if the ten's and the unit's digit are interchanged, the now number is more than the original by 36. Find the number? 1 solutions Answer 118994 by scott8148(6628)   on 2008-10-11 17:26:51 (Show Source): You can put this solution on YOUR website!"the sum of the digit's of a three digit number is 14" __ h+t+u=14 __ h=14-t-u "If the hundred's and unit's are interchanged the resulting number is 594 more than original" __ h+10t+100u=100h+10t+u+594 __ substituting __ 14-t-u+10t+100u=1400-100t-100u+10t+u+594 __ 198u=1980-99t __ 2u=20-t "ten's and the unit's digit are interchanged, the now number is more than the original by 36" __ 100h+t+10u=100h+10t+u+36 __ 9u=9t+36 __ u=t+4 substituting __ 2t+8=20-t __ 3t=12 __ t=4 substituting __ u=4+4 __ u=8 substituting __ h=14-4-8 __ h=2 248 is the number