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 'checkley75'

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, >>Next

 Polynomials-and-rational-expressions/69202: Please help me solve for b for this equation: 1 solutions Answer 49246 by checkley75(3666)   on 2007-02-03 18:22:35 (Show Source): You can put this solution on YOUR website!16/b-5=3/b-2/b 16/b-3/b+2/b=5 (16-3+2)/b=5 15/b=5 cross multiply and we get: 5b=15 b=15/5 b=3 proof 16/3-5=3/5-2/5 5 1/3-5=1/3 1/3=1/3
 Polynomials-and-rational-expressions/69220: Find the LCD of 7 8 ---------------,------ a^2 + 2a - 63 a+91 solutions Answer 49243 by checkley75(3666)   on 2007-02-03 18:14:30 (Show Source): You can put this solution on YOUR website!a^2+2a-63=(a-7)(a+9) thus the common denominator is (a-7)(a+9):
 Linear-equations/69224: Solve the system by graphing 3x+y=-1 9x+3y=-3 Please help solve this1 solutions Answer 49242 by checkley75(3666)   on 2007-02-03 18:11:49 (Show Source): You can put this solution on YOUR website!3x+y=-1 y=-3x-1 9x+3y=-3 3y=-9x-3 y=-3x-1 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -3x -1 and y = -3x -1).
 Linear-equations/69225: Solve the system by graphing x+y=4 -x+y=2 PLease help solve this1 solutions Answer 49241 by checkley75(3666)   on 2007-02-03 18:06:52 (Show Source): You can put this solution on YOUR website!x+y=4 y=-x+4 -x+y=2 y=x+2 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -x +4 and y = x +2).
 Linear-equations/69226: Solve the system by addition 5x-4y=-5 x-2y=-7 Please help solve this1 solutions Answer 49240 by checkley75(3666)   on 2007-02-03 17:57:54 (Show Source): You can put this solution on YOUR website!5X-4Y=-5 NOW MULTIPLY THE SECOND EQUATION BY -5 AND ADD THEM: -5X+10Y=35 --------------------------------- 6Y=30 Y=30/6 Y=5 ANSWER. NOW SUBSTITUTE 5 FOR Y AND SOLVE FOR X THUS: 5X-4*5=-5 5X-20=-5 5X=-5+20 5X=15 X=15/5 X=3 ANSWER PROOF 3-2*5=-7 3-10=-7 -7=-7
 Polynomials-and-rational-expressions/69232: add 1 + 1 ----- + ------ 1 - x^2 + x - 11 solutions Answer 49239 by checkley75(3666)   on 2007-02-03 17:51:19 (Show Source): You can put this solution on YOUR website!1/(1-X^2)+1/(X-1) [(X-1)+(1-X^2)]/(1-X^2)(X-1) (X-1+1-X^2)/(1-X^2)(X-1) X-X^2/(1-X^2)(X-1) X(1-X)/(1-X)(1+X)(X-1) FACTOR OUT THE (1-X) TERMS & WE HAVE LEFT X/(1+X)(X-1) X/(X^2-1)
 Polynomials-and-rational-expressions/69230: is 2x-3 a factor of 8x^3-27? Explain why or why not.1 solutions Answer 49238 by checkley75(3666)   on 2007-02-03 17:41:15 (Show Source): You can put this solution on YOUR website!IN ORDER FOR (2X-3) TO BE A FACTOR OF (8X^3-27) WHEN DIVIED SHALL HAVE NO REMAINDER. USING LONG DIVISION WE GET (8X^3-27)/(2X-3)=(4X^2+6X+9). THEREFORE (2X-3) IS A FACTOR OF (8X^3-27). PROOF WE MULTIPLY 4X^2+6X+9 BY 2X-3 THUS ------------------------------ 4X^2+6X+9 *2X-3 ------------------------------- 8X^3+12X^2+18X-12X^2-18X-27 OR 8X^3-27 THEREFORE (2X-3)(4X^2+6X+9)=8X^3-27 AND (2X-3) IS A FACTOR.
 Polynomials-and-rational-expressions/69207: Please help me multiply this equation: 1 solutions Answer 49237 by checkley75(3666)   on 2007-02-03 17:27:36 (Show Source): You can put this solution on YOUR website!(B+.6)(B-.5) B^2+.6B-.5B-.3 B^2+.1B-.3
 Functions/69214: 20 simplify: 24s/3s1 solutions Answer 49236 by checkley75(3666)   on 2007-02-03 16:57:23 (Show Source): You can put this solution on YOUR website!24s/3s=8
 Complex_Numbers/69132: factor 5xsquared-15x-201 solutions Answer 49223 by checkley75(3666)   on 2007-02-03 11:10:31 (Show Source): You can put this solution on YOUR website!5X^2-15X-20 5(X^2-3X-4) 5(X-4)(X+1)
 Complex_Numbers/69133: factor 3y(x-3)-2(x-3)1 solutions Answer 49222 by checkley75(3666)   on 2007-02-03 11:08:12 (Show Source): You can put this solution on YOUR website!SEEING AS (X-3) IS COMMON TO BOTH TERMS WE CAN ADD THE TWO MULTIPLIERS THUS (3Y-2)(X-3) ----------------------------------------------- THINK OF THE 3Y AS A NUMBER SAY 4 THEN THE ANSWER WOULD BE (4-2)(X-3) THUS WE HAVE 2(X-3) ----------------------------------------------- HOPE THIS HELPS
 Numeric_Fractions/69139: the square tiles in mr. cooks math class measures 2 1/4 feet across. the students counted that the classroom is 5 1/3 tiles wide. How wide is mr. cooks classroom? 1 solutions Answer 49220 by checkley75(3666)   on 2007-02-03 11:02:29 (Show Source): You can put this solution on YOUR website!2.25 FEET IS THE MEASUREMENT OF THE TILES. GIVEN THAT THE ROOM WIDTH IS 5.33 TILES WIDE WE HAVE A ROOM WIDTH OF 2.25*5.33=26.983125 FEET WIDE.
 Polynomials-and-rational-expressions/69146: find (x - 7)2 and which of the following is a pattern for squaring a binomial, a + b? a. a2 + 2ab + b2 b. a2 +b2 c. a2 + ab + b2 d. a2 - b21 solutions Answer 49219 by checkley75(3666)   on 2007-02-03 10:58:17 (Show Source): You can put this solution on YOUR website!(X-7)(X-7)USING THE FOIL METHOD WE GET X^2-7X-7X+49 OR X^2-14X+49 -------------------------------------------------------- (A+B)(A+B) A^2+AB=AB+B^2 OR A^2+2AB+B^2 ANSWER A).
 Polynomials-and-rational-expressions/69148: find the area of a square with side s = 2x + 3. a. 4x2 +9 b. 2x2 + 6x +9 c. 4x2 + 6x +9 d. 4x2 + 12x + 9 1 solutions Answer 49218 by checkley75(3666)   on 2007-02-03 10:54:21 (Show Source): You can put this solution on YOUR website!A SQUARE AREA=SIDE*SIDE. THUS (2X+3)(2X+3) USING THE FOIL METHOD WE GET 4X^2+6X+6X+9 OR 4X^2+12X+9 OR ANSWER D).
 Linear-equations/69152: Write the equation of the line passing through each of the given points with the indicated slope. Give your results in slope-intercept form, where possible. (Rewrite into standard form) (0,5), m = -3/51 solutions Answer 49216 by checkley75(3666)   on 2007-02-03 10:50:42 (Show Source): You can put this solution on YOUR website!Y=mX+b IS THE STANDARD LINE FORMULA WITH m=SLOPE & b=Y INTERCEPT. TO FIND THE Y INTERCEPT WE SUBSTITUTE THE POINT VALUES FOR X&Y (0,5) THUS WE GET 5=-3/5*0+b 5=b THEREFORE THE EQUATION IS Y=-3/5X+5
 Linear_Equations_And_Systems_Word_Problems/69032: Find the slope of any line perpendicular to the line through points (0, 5) and (-3, -4).1 solutions Answer 49189 by checkley75(3666)   on 2007-02-02 22:15:16 (Show Source): You can put this solution on YOUR website!slope of the line through (0,5) & (-3,-4) is (-4-5)/(-3-0) -9/-3 3 for the slope. thus the perpendicular line has to have a slope of the negative reciprical of this slope thus it's slope is -1/3
 Graphs/69112: how many liters of a 10% acid solution must be mixed with a 50% acid solution in order to obtain 20 liters of a 30% solution?1 solutions Answer 49188 by checkley75(3666)   on 2007-02-02 22:09:45 (Show Source): You can put this solution on YOUR website!.1(20-x)+.5x=.2*20 2-.1x+.5x=4 .4x=2 x=2/.4 x=5 liters of 50% acid solution 20-5=15 liters of 10% acid solution proof .1*15+.5*5=4 1.5+2.5=4 4=4 ------------------------------------------------------------- MY APPOLOGIES: I MISTAKENLY USED 20% OF 20 LITERS INSTEAD OF 30% OF 20 LITERS: THUS THE EQUATION SHOULD HAVE BEEN .1(20-X)+.5X=.3*20 2-.1X+.5X=6 .4X=6-2 .4X=4 X=4/.4 X=10 LITERS OF 50% IS REQUIRED TO MAKE 20 LITERS OF 30%. I MUST HAVE BEEN HALF ASLEEP WHEN I DID THIS PROBLEM LAST NIGHT. AGAIN I'M SORRY FOR THE MISTAKE. HOPE THIS WILL NOT DISCOURAGE YOU FROM USING ALGEBRA.COM IN THE FUTURE TO HELP WITH YOUR MATH DIFFICULTIES.
 Linear-equations/69087: Solve the following system of linear inequalities by graphing x-2y>4 x<4 Please help on this1 solutions Answer 49187 by checkley75(3666)   on 2007-02-02 22:04:54 (Show Source): You can put this solution on YOUR website!x-2y=4 -2y=-x+4 y=-x/-2+4/-2 y=x/2-2 x=4 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions x = 4 and y = x/2 -2).
 Geometric_formulas/68982: Please help me solve this equation: 10x-22=(8x+8)^2 I need to solve for x.1 solutions Answer 49111 by checkley75(3666)   on 2007-02-01 21:14:17 (Show Source): You can put this solution on YOUR website!10X-22=(8X+8)^2 10X-22=64X^2+128X+64 64X^2+128X-10X+64+22=0 64X^2+118X+86=0 32X^2+59X+43=0 USING THE QUADRATIC EQUATION WE GET X=(-B+-SQRT[B^2-4*A*C])/2A X=(-59+-SQRT[-59^2-4*32*43])/2*32 X=(-59+-SQRT[3481-5504])/64 X=(-59+-SQRT-20230/64 X=(-59+-44.98i/64 X=-59/64+44.98i/64 X=-.92+.7i X=-.92-.7i
 Geometry_Word_Problems/68989: the length of a rectangle is 4m more than the width.The area is 30m squared. Find the width and length.1 solutions Answer 49104 by checkley75(3666)   on 2007-02-01 20:51:11 (Show Source): You can put this solution on YOUR website!L*W=30 L=W+4 thus (W+4)W=30 W^2+4W=30 W^2+4W-30=0 USING THE QUADRATIC EQUATION WE GET X=(-B+-SQRT[B^2-4QC])/2A X=(-4+-SQRT16-4*1*-30])/2*1 X=(-4+-SQRT16+120])/2 X=(-4+-SQRT136)/2 X=(-4+-11.66)/2 X=(-4+11.66)/2 X=7.66/2 X=3.83M IS THE WIDTH. THUS THE LENGTH IS L*3.83=30 L=30/3.83 L=7.83M IS THE LENGTH PROOF 3.83*7.83=30 30=30
 Probability-and-statistics/68999: The question is: IN 1990 the united states population of people over 65 years old was 31.2 million which was 12.6% of the total U.S. population. Find the total population of the U.S. in 19901 solutions Answer 49092 by checkley75(3666)   on 2007-02-01 20:08:12 (Show Source): You can put this solution on YOUR website!31.2=.126x x=31.2/.126 x=247.61904 million people in 1990
 Linear-equations/68993: Rewrite the equation 4x-6y=-30 as a function of x. Please help me1 solutions Answer 49091 by checkley75(3666)   on 2007-02-01 20:05:05 (Show Source): You can put this solution on YOUR website!4x-6y=-30 4x=6y-30 x=6y/4-30/4 x=3y/2-15/2
 Linear-equations/68994: Write the equation of the line passing through (3,-7) and (-6,-7). Please help me on this one1 solutions Answer 49090 by checkley75(3666)   on 2007-02-01 20:02:59 (Show Source): You can put this solution on YOUR website!(3,-7)(-6,-7) creates a slope of (-7+7)/(-6-3) 0/-9 slope=0 this defines a horizontal line through y=-7. thus the equation is y=0x-7 y=-7
 Money_Word_Problems/68997: Alicia recieved some money from work. She spent one-fifth of it on gas. Then she spent half of what she had left on clothes. She spent seven dollars at lunch. When she got home she had thirteen dollars left. How much did she have to start with?1 solutions Answer 49089 by checkley75(3666)   on 2007-02-01 19:58:31 (Show Source): You can put this solution on YOUR website!4/5x(.5)-7=13 2x/5=20 2x=100 x=100/2 x=50 amount of money she started with. proof 4/5*50(.5)-7=13 200/5*.5=13+7 40*.5=20 20=20
 Human-and-algebraic-language/68978: The difference between two numbers is 16. Five times the smaller is the same aas 8 less that twice the larger. Find the numbers. I need this to be in a system of two equations in two variables.1 solutions Answer 49082 by checkley75(3666)   on 2007-02-01 17:45:04 (Show Source): You can put this solution on YOUR website!X-Y=16 X=Y+16 NOW SUBSTITUTE (Y+16) FOR X IN THE OTHER EQUATION 5X-8=2Y THUS 5(Y+16)-8=2Y 5Y+80-8=2Y 5Y-2Y=+8-80 3Y=-72 Y=-72/3 Y=-24 THUS X-(-24)=16 X+24=16 X=16-24 X=-8 PROOF 5*-8-8=2*-24 -40-8=-48 -48=-48
 Linear-systems/68974: what are the two coordinates for the problem below: 3x+6y=6 2x-3y=4 1 solutions Answer 49081 by checkley75(3666)   on 2007-02-01 17:35:15 (Show Source): You can put this solution on YOUR website!3x+6y=6 6y=-3x+6 y=-3x/6+6/6 y=-x/2+1 ------------------------ 2x-3y=4 -3y=-2x+4 y=-2x/3+4/3 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -x/2 +1 and y = -2x/3 +4/3).
 Linear-equations/68957: How do you graph the linear equation: x - 7 = 3y1 solutions Answer 49079 by checkley75(3666)   on 2007-02-01 17:24:38 (Show Source): You can put this solution on YOUR website!X-7=3Y -3Y=-X+7 Y=-X/-3+7/-3 Y=X/3-7/3 (graph 300x200 pixels, x from -6 to 10, y from -10 to 10, y = x/3 -7/3).
 Linear-equations/68959: This question is from textbook If you were asked to solve 2x + 3=4x-12 by the x-intercept method, why would you not get the correct answer by graphing? I am really bad at this, and need to learn it step by step (like talking to a baby!)1 solutions Answer 49078 by checkley75(3666)   on 2007-02-01 17:19:45 (Show Source): You can put this solution on YOUR website!2X+3=4X-12 2X-4X=-12-3 -2X=-15 X=-15/-2 X=7.5
 Linear_Equations_And_Systems_Word_Problems/68962: Determine the equation of each line. Write the answer in slope intercept form the line through (4,0) that is perpendicular to the line x + y=31 solutions Answer 49077 by checkley75(3666)   on 2007-02-01 17:11:19 (Show Source): You can put this solution on YOUR website!x+y=3 y=-x+3 this has a slope is -1. the perpendicular line would have a slope +1. thus the line through (4,0) with a slope of 1 is: 0=4+b b=-4 thus the formula is y=x-4
 Money_Word_Problems/68963: Jack's overtime wage is \$3 per hour more than his regular hourly wage. He worked for 5 hours at his regular wage and 4 hours at the overtime wage. He earned \$66.00 Find his regular wage.1 solutions Answer 49076 by checkley75(3666)   on 2007-02-01 17:03:42 (Show Source): You can put this solution on YOUR website!5x+4(x+3)=66 5x+4x+12=66 9x=66-12 9x=54 x=54/9 x=\$6 for regular hours thus the overtime hourly rate=6+3=\$9 for the overtime hours. 5*6+4*9=66 30+36=66 66=66