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Recent problems solved by 'sofiyac'

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 Complex_Numbers/736466: 1. x^4 + 3x^2 - 4 =01 solutions Answer 449867 by sofiyac(695)   on 2013-04-11 12:19:29 (Show Source): You can put this solution on YOUR website!Make sure you include instructions with your problem on what it asks you to do so we don't have to guess. x^4 + 3x^2 - 4 =0 (x^2 + 4)(x^2 - 1) =0 (x^2 + 4)(x+1)(x-1) =0 x^2 + 4=0 or x+1 =0 or x-1=0 x^2 = -4 or x+1 =0 or x-1=0 solve for x x=2i or x=-1 or x=1
 Age_Word_Problems/736499: Tom is five times as old as his little brother Ben. Together, the some of their ages are 42. How old is each? 1 solutions Answer 449866 by sofiyac(695)   on 2013-04-11 12:11:08 (Show Source): You can put this solution on YOUR website!Let ben be x years old then Tom would be 5x years old Add their ages and make sum equal to 42 x+5x=42 solve for x 6x=42 divide each side by 6 x=7 so ben is 7 years old and tom is 5*7=35 years old
 test/736476: Factor by grouping 5x^2-20x+2x-81 solutions Answer 449865 by sofiyac(695)   on 2013-04-11 12:09:00 (Show Source):
 percentage/736482: What is 10% off of \$7.35?1 solutions Answer 449864 by sofiyac(695)   on 2013-04-11 12:06:09 (Show Source): You can put this solution on YOUR website!divide 7.35 by 10 or simply move the decimal point to the left by one spot, either way the answer is 0.735
 Travel_Word_Problems/736497: I have to drive the distance of 428 miles. My gas tank holds 18 gallons of gas. I pay \$3.99 per gallon of gas. How much will the gas cost me to drive the 428 miles.1 solutions Answer 449863 by sofiyac(695)   on 2013-04-11 12:03:28 (Show Source): You can put this solution on YOUR website!I don't think there's enough information to solve this problem, we need to know how many miles you can drive per gallon.
 Miscellaneous_Word_Problems/736486: A store sells tents, sleeping bags, and camp stools. A customer buys a tent, 2 sleeping bags, and 5 camping stools for \$220. The price of the tent is 7 times the cost of a camp stool. The cost of a sleeping bag is \$40 more than the cost of a camp stool. Find the cost of each item. 1 solutions Answer 449861 by sofiyac(695)   on 2013-04-11 11:59:58 (Show Source): You can put this solution on YOUR website!let camp stools cost x dollars then tent would cost 7x dollars and sleeping bag cost would be x+40 A customer buys a tent, 2 sleeping bags, and 5 camping stools for \$220, so now we plug in the above defined cost into this sentence to make equation out of it. one tent would cost 1*7x 2 sleeping bags would cost 2(x+40) 5 camping stools would cost 5x Next we add them all up and make the sum equal to 220 7x+2(x+40)+5x=220 now we solve for x 7x+2x+80+5x=220 14x=140 divide both sides by 14 x=10 now go back all the way to the top where we defined how much everything cost and plug in 10 where you see x camp stools cost x dollars so camp stools cost \$10 tent would cost 7x dollars so tent costs 7*10=\$70 sleeping bag cost would be x+40 so sleeping bag cost is 10+40=\$50
 Numeric_Fractions/729161: x to the second power plus 6x= negative8 1 solutions Answer 445761 by sofiyac(695)   on 2013-03-21 19:40:58 (Show Source): You can put this solution on YOUR website!x^2+6x=-8 x^2+6x+8=0 (x+4)(x+2)=0 x=-4 or x=-2
 Equations/729174: n= 9, e= 18 and l= -54 Evaluate the algebraic expression n*(e+1)/91 solutions Answer 445760 by sofiyac(695)   on 2013-03-21 19:39:18 (Show Source): You can put this solution on YOUR website!n= 9, e= 18 and l= -54 Evaluate the algebraic expression
 Linear-equations/729185: how to graph y=x+5 1 solutions Answer 445759 by sofiyac(695)   on 2013-03-21 19:37:03 (Show Source): You can put this solution on YOUR website!plug in x any number for x, solve for y x=0 then y=5 so first point (0,5) then plug in different number for x and find different y, so lets try x=2 then y=7 so second point would be (2,7) plot both points and connect the dots
 Quadratic_Equations/729183: 4(x+9)^2=241 solutions Answer 445755 by sofiyac(695)   on 2013-03-21 19:33:50 (Show Source): You can put this solution on YOUR website! divide both sides by 4 subract 6 from each side of the equal side now you can use the quadratic formula to solve for x simplify sqrt(24) divide everything by 2
 Numeric_Fractions/729186: How do you rename a mixed number in simplest form. what would the simplest form of be?1 solutions Answer 445754 by sofiyac(695)   on 2013-03-21 19:32:37 (Show Source): You can put this solution on YOUR website! to rename you take whole number (9) multiply by bottom number (3) and add top number (5) = your new top. The bottom remains the same (3).
 Quadratic_Equations/729189: Please help me solve this quadratic: 4(x+9)^2=24 What I've tried doing: 4(x+9)^2=24 4x+36^2=24 4x+1296=24 4x+1272=0 I am not sure what to do from here. I have also decided that it cannot be factored evenly.1 solutions Answer 445752 by sofiyac(695)   on 2013-03-21 19:29:26 (Show Source): You can put this solution on YOUR website! divide both sides by 4 subract 6 from each side of the equal side now you can use the quadratic formula to solve for x simplify sqrt(24) divide everything by 2
 Linear-systems/702135: Please help me with Algebra 1 Mid chapter Quiz Page 212 number 13-15 It's said Suppose you have already saved \$75 toward the cost of a new television. You plan to save \$5 more each week for the next several weeks. 13. Write an equation for the total amount T you will have w weeks from now. 14. Graph the equation. 15. Find the total amount saved after 10 weeks. 1 solutions Answer 432822 by sofiyac(695)   on 2013-01-14 20:28:12 (Show Source): You can put this solution on YOUR website!13.T=75+5w 15.T=75+5*10 T=75+50 T=125 14.
 test/702143: 1 solutions Answer 432821 by sofiyac(695)   on 2013-01-14 20:25:00 (Show Source):
 test/702142: 1 solutions Answer 432820 by sofiyac(695)   on 2013-01-14 20:24:44 (Show Source):
 Travel_Word_Problems/702139: Gas mileage of a car when traveling 5522 km using 11 gallons of gas1 solutions Answer 432819 by sofiyac(695)   on 2013-01-14 20:22:18 (Show Source): You can put this solution on YOUR website!5522/11=502 gallons per km
 Travel_Word_Problems/702141: how far, in meters, will a car travel in 20 seconds at an average speed of 20m/s?1 solutions Answer 432818 by sofiyac(695)   on 2013-01-14 20:21:18 (Show Source): You can put this solution on YOUR website!20*20=400 meters
 Expressions-with-variables/702133: which of the following expressions is equivalent to 20-4/5x greater or equal to 16? A. x is greater than or equal to 5 B. x is less than or equal to 5 C. x is greater or equal to 32 1/2 D. x is less than or equal to 32 1/2 Can you please explain why? Thank You1 solutions Answer 432816 by sofiyac(695)   on 2013-01-14 20:20:42 (Show Source): You can put this solution on YOUR website!20-4/5x>=16 solve it for x, that will tell you why -4/5x>=-4 we flip the sign because we multiplied both sides by negative 5/4 x<=5 so answer is B
 Expressions-with-variables/702132: which of the following expressions is equivalent to 20-4/5x greater or equal to 16? A. x is greater than or equal to 5 B. x is less than or equal to 5 C. x is greater or equal to 32 1/2 D. x is less than or equal to 32 1/21 solutions Answer 432815 by sofiyac(695)   on 2013-01-14 20:20:14 (Show Source): You can put this solution on YOUR website!20-4/5x>=16 solve it for x, that will tell you why -4/5x>=-4 we flip the sign because we multiplied both sides by negative 5/4 x<=5 so answer is B
 Quadratic_Equations/702137: 3a2b-3ab find ab-c 1 solutions Answer 432812 by sofiyac(695)   on 2013-01-14 20:18:00 (Show Source): You can put this solution on YOUR website!there's no c in your equation, repost the problem
 Exponents/702031: (.5y)^2 (2y)^51 solutions Answer 432811 by sofiyac(695)   on 2013-01-14 20:16:12 (Show Source): You can put this solution on YOUR website!0.25y^2*32y^5=8y^7
 Equations/702127: solve for the equation for x:y= mx + b 1 solutions Answer 432809 by sofiyac(695)   on 2013-01-14 20:09:10 (Show Source): You can put this solution on YOUR website!mx=b-y x=(b-y)/m
 Linear-equations/702126: Find x : 3x=11 solutions Answer 432808 by sofiyac(695)   on 2013-01-14 20:08:29 (Show Source): You can put this solution on YOUR website!divide both sides by 3
 Geometry_proofs/702130: a proof for theorem 6-4 1 solutions Answer 432807 by sofiyac(695)   on 2013-01-14 20:07:48 (Show Source): You can put this solution on YOUR website!we don't have your book so we don't know what 6.4 is, post the whole problem
 Inverses/702122: 2(y-3)=4y+61 solutions Answer 432806 by sofiyac(695)   on 2013-01-14 20:01:10 (Show Source): You can put this solution on YOUR website!2y-6=4y+6 -12=2y -6=y
 Average/702118: Find values for x and y that fit both of the equations 5x+3y = 8 and 4x + 3y = -2.1 solutions Answer 432805 by sofiyac(695)   on 2013-01-14 20:00:17 (Show Source): You can put this solution on YOUR website!5x+3y = 8 4x+3y = -2 multiply this one by -1 *** 5x+3y = 8 -4x-3y=-2 add the two equations *** x=6 now plug that into either of the originals and solve for y, i'll use first one 5*6+3y=8 3y=-22 y=-22/3 (6,-22/3)
 Linear-equations/702120: For which 5-years time period was rate of change the greatest? the least?1 solutions Answer 432802 by sofiyac(695)   on 2013-01-14 19:57:37 (Show Source): You can put this solution on YOUR website!we need to see a graph for this one
 Sequences-and-series/702117: The question is: eight subtracted from six times a number is 298. Find the number. Thank you! ~Kelly1 solutions Answer 432801 by sofiyac(695)   on 2013-01-14 19:56:38 (Show Source): You can put this solution on YOUR website!6x-8=298 6x=306 x=51
 test/702027: 3·+2[3·+3]=61 solutions Answer 432800 by sofiyac(695)   on 2013-01-14 19:55:24 (Show Source): You can put this solution on YOUR website!i can't tell what the little dots are in front of the plus side, please re submit the problem and copy correctly
 test/702115: 1 solutions Answer 432798 by sofiyac(695)   on 2013-01-14 19:54:22 (Show Source): You can put this solution on YOUR website!test
 test/702028: -4x+2y=-20 -7x+8y=-81 solutions Answer 432797 by sofiyac(695)   on 2013-01-14 19:53:42 (Show Source): You can put this solution on YOUR website!-4x+2y=-20 multiply this one by -4 -7x+8y=-8 *** 16x-8y=80 -7x+8y=-8 now add them *** 9x=72 divide both sides by 9 x=8 now plug this into either of the original equations, i'll use first one -4(8)+2y=-20 -32+2y=-20 add 32 to each side 2y=12 divide both sides by 2 y=6 (8,6)