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Recent problems solved by 'user_dude2008'

user_dude2008 answered: 1858 problems
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Angles/346253: What are the measures of two complementary angles if the difference is 12? thank you so much! 1 solutions Answer 247597 by user_dude2008(1861)   on 2010-09-21 15:57:01 (Show Source): You can put this solution on YOUR website! x-y=12 x+y=90 ----> y=90-x x-y=12 x-(90-x)=12 x-90+x=12 2x=12+90 2x=102 x=102/2 x=51 y=90-x=90-51=39 Angles are 51 and 39

Linear-systems/346151: y = -4x - 7 y = 3x 1 solutions Answer 247596 by user_dude2008(1861)   on 2010-09-21 15:54:25 (Show Source): You can put this solution on YOUR website! y = 3x -4x-7 = 3x -4x-3x=7 -7x=7 x=-1 y=3x=3(-1)=-3 Answer: (-1,-3)

Linear-systems/346247: Solve the system of equations by graphing. Then classify the system. 5x+y=26 6x+7y=-21 1 solutions Answer 247595 by user_dude2008(1861)   on 2010-09-21 15:53:19 (Show Source): You can put this solution on YOUR website! Solution: (7,-9) Consistent and independent

Linear_Algebra/345154: find the x and y intercepts of y=-6? 1 solutions Answer 246875 by user_dude2008(1861)   on 2010-09-19 16:58:59 (Show Source): You can put this solution on YOUR website! x-intercepts: none y-intercepts: (0,-6)

Inequalities/345107: 2(3d-4)< 4 + 6d - 15 1 solutions Answer 246862 by user_dude2008(1861)   on 2010-09-19 14:13:16 (Show Source): You can put this solution on YOUR website! 2(3d-4) < 4 + 6d - 15 6d-8 < 6d - 11 6d-6d < - 11+8 0 < - 3 No solutions

Conjunction/345109: if p is false and q is true, what is the truth for p=>q 1 solutions Answer 246861 by user_dude2008(1861)   on 2010-09-19 14:11:19 (Show Source): You can put this solution on YOUR website! p => q F => T T

Square-cubic-other-roots/345128: solve s^2-7s-8=0 1 solutions Answer 246860 by user_dude2008(1861)   on 2010-09-19 14:10:05 (Show Source): You can put this solution on YOUR website! s^2-7s-8=0 (s-8)(s+1)=0 s-8=0 or s+1=0 s=8 or s=-1

Equations/345129: -5k-19=5-13k 1 solutions Answer 246859 by user_dude2008(1861)   on 2010-09-19 14:09:27 (Show Source): You can put this solution on YOUR website! -5k-19=5-13k -5k+13k=5+19 8k=24 k=24/8 k=3

percentage/345133: a person standing on mars would weigh 38% of his earth weight. What is the mars weight of a person with the earth weight of 55 kilograms 1 solutions Answer 246858 by user_dude2008(1861)   on 2010-09-19 14:08:26 (Show Source): You can put this solution on YOUR website! .38*55 = 20.9

Percentage-and-ratio-word-problems/344950: A water tank is 70% Full. The capacity of the tank is 515 liters. What is the volume of water in the tank? 1 solutions Answer 246806 by user_dude2008(1861)   on 2010-09-18 23:46:48 (Show Source): You can put this solution on YOUR website! .7*515 = 360.5

Probability-and-statistics/344945: Please solve this question for me. Thank you! A student is taking two courses, history and math. The probability the student will pass the history course is .60, and the probability of passing the math course is .70. The Probability of passing both is .50. What is the probability of passing at least one? 1 solutions Answer 246805 by user_dude2008(1861)   on 2010-09-18 23:44:42 (Show Source): You can put this solution on YOUR website! P(pass at least one) = P(pass history) + P(pass math) - P(pass both) P(pass at least one) = 0.60 + 0.70 - 0.50 P(pass at least one) = 0.80

test/344928: classrooms on one side of the drama building are all numbered with consecutive off intergers. if the first classroom on this side of the buiding numbered d, write an expression in d for the sum of the first seven classroom numbers in a row. then simplify this expression. 1 solutions Answer 246789 by user_dude2008(1861)   on 2010-09-18 22:44:00 (Show Source): You can put this solution on YOUR website! d+(d+2)+(d+4)+(d+6)+(d+8)+(d+10)+(d+12) = 7d+42

Square-cubic-other-roots/344906: ± (square root of 81) 1 solutions Answer 246784 by user_dude2008(1861)   on 2010-09-18 22:10:01 (Show Source): You can put this solution on YOUR website! ± (square root of 81) = ± 9

Functions/344908: Perform the indicated operation. 3x^2-5x/18x-30 1 solutions Answer 246783 by user_dude2008(1861)   on 2010-09-18 22:09:43 (Show Source): You can put this solution on YOUR website! (3x^2-5x)/(18x-30) = ( x(3x-5) )/( 6(3x-5) ) = x/6

Polynomials-and-rational-expressions/344892: factor completely 36w^2 -12w +1 1 solutions Answer 246779 by user_dude2008(1861)   on 2010-09-18 22:02:24 (Show Source): You can put this solution on YOUR website! 36w^2 -12w +1 = (6w-1)^2

Exponents/344889: how can i show any number or espression raised to the "0" power = 1 1 solutions Answer 246777 by user_dude2008(1861)   on 2010-09-18 22:01:19 (Show Source): You can put this solution on YOUR website!

real-numbers/344813: Let B= {x:x is an integer between -4 and 3 (not including -4 and 3)}. How many elements are in BXBXB? 1 solutions Answer 246728 by user_dude2008(1861)   on 2010-09-18 18:31:39 (Show Source): You can put this solution on YOUR website! B={-3,-2,-1,0,1,2} ----> 6 elements Answer: 6*6*6 = 216

Systems-of-equations/344789: 1.) 4u=37+4u 2.) 5x+8=7x+8 3.) 2x-5=3x+4 1 solutions Answer 246727 by user_dude2008(1861)   on 2010-09-18 18:30:16 (Show Source): You can put this solution on YOUR website! 1.) 4u=37+4u 4u-4u=37 0=37 no solution 2.) 5x+8=7x+8 5x-7x=8-8 -2x=0 x=0 3.) 2x-5=3x+4 2x-3x=4+5 -x=9 x=-9

Systems-of-equations/344782: 3x+2y=47 1 solutions Answer 246724 by user_dude2008(1861)   on 2010-09-18 18:28:05 (Show Source): You can put this solution on YOUR website! 3x+2y=47 2y=-3x+47 y=(-3x+47)/2

Equations/344842: -5x-3=x+6 1 solutions Answer 246721 by user_dude2008(1861)   on 2010-09-18 18:27:31 (Show Source): You can put this solution on YOUR website! -5x-3=x+6 -5x-x=6+3 -6x=9 x=-9/6 x=-3/2

Equations/344799: 4n-10=12 1 solutions Answer 246720 by user_dude2008(1861)   on 2010-09-18 18:26:56 (Show Source): You can put this solution on YOUR website! 4n-10=12 4n=12+10 4n=22 n=22/4 n=11/2

Exponents-negative-and-fractional/344833: Hi, could you please help me with this problem: I'm not positive if this is the correct way to type the problem but for clarification, the 3 is being multiplied by the square root of 50x, it is not an index Thanks 1 solutions Answer 246719 by user_dude2008(1861)   on 2010-09-18 18:23:32 (Show Source): You can put this solution on YOUR website!

Numeric_Fractions/344840: this is an Integer's question... 40-(30-3) 33-(3-13) 1 solutions Answer 246717 by user_dude2008(1861)   on 2010-09-18 18:21:05 (Show Source): You can put this solution on YOUR website! 40-(30-3) = 40-27 = 13 33-(3-13) = 33-(-10) = 33+10 = 43

Rectangles/344836: 1. The perimeter of a rectangle is 32 inches, and the area is 60 square inches. find the length and width of the rectangle. 1 solutions Answer 246714 by user_dude2008(1861)   on 2010-09-18 18:19:47 (Show Source): You can put this solution on YOUR website! 2L+2W=32 ----> L+W=16 LW=60 ----> L=60/W L+W=16 60/W+W=16 60+w^2=16w w^2-16w+60=0 (w-10)(w-6)=0 w-10=0 or w-6=0 w=10 or w=6 Answer: Width = 6 Length = 10

Equations/344837: 2x+7-5(x+1)=-(-4x-7) 1 solutions Answer 246712 by user_dude2008(1861)   on 2010-09-18 18:17:12 (Show Source): You can put this solution on YOUR website! 2x+7-5(x+1)=-(-4x-7) 2x+7-5x-5=4x+7 -3x+2=4x+7 -3x-4x=7-2 -7x=5 x=-5/7

Equations/344825: 9(b-4)=27 1 solutions Answer 246711 by user_dude2008(1861)   on 2010-09-18 18:16:16 (Show Source): You can put this solution on YOUR website! 9(b-4)=27 b-4=27/9 b-4=3 b=3+4 b=7

Equations/344785: 2/3x-5=-2x+3 1 solutions Answer 246688 by user_dude2008(1861)   on 2010-09-18 15:23:15 (Show Source): You can put this solution on YOUR website! 2/3x-5=-2x+3 2/3x+2x=3+5 8/3x=8 8x=24 x=24/8 x=3

Problems-with-consecutive-odd-even-integers/344737: The product of two consecutive even integers is 76 more than 2 times their sum. Find these two positive integers 1 solutions Answer 246687 by user_dude2008(1861)   on 2010-09-18 14:53:05 (Show Source): You can put this solution on YOUR website! x(x+2)=2(x+x+2)+76 x^2+2x=2x+2x+4+76 x^2+2x=4x+80 x^2+2x-4x-80=0 x^2-2x-80=0 (x-10)(x+8)=0 x-10=0 or x+8=0 x=10 or x=-8 Numbers: 10, 12

Quadratic_Equations/344725: 12x^2+11x-15=0 1 solutions Answer 246686 by user_dude2008(1861)   on 2010-09-18 14:50:36 (Show Source): You can put this solution on YOUR website! 12x^2+11x-15=0 12x^2-9x+20x-15=0 3x(4x-3)+5(4x-3)=0 (3x+5)(4x-3)=0 3x+5=0 or 4x-3=0 x=-5/3 or x=3/4

Geometry_Word_Problems/344780: The lengths of the sides of a triangle are consecutive odd integers. If the perimeter is 1 less than four times the shortest side, find the lengths of each side. 1 solutions Answer 246685 by user_dude2008(1861)   on 2010-09-18 14:33:18 (Show Source): You can put this solution on YOUR website! x+(x+2)+(x+4)=4x-1 3x+6=4x-1 3x-4x=-1-6 -x=-7 x=7 Lengths: 7, 9, 11

Square-cubic-other-roots/344776: Rewrite the rational exponent 4 sqrt 23???? 1 solutions Answer 246684 by user_dude2008(1861)   on 2010-09-18 14:31:41 (Show Source): You can put this solution on YOUR website!