10 points to the first to answer there correct its pre-algerbra?
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Notes 8.3\n\nExample 1:  Harry has 30 coins.  He has only quarters and dimes which are valued at $4.80. \n                    How many of each type of coin does Harry have?\n\nx = number of quarters\ny = number of dimes\n\nSince there are 30 coins total:  x + y = 30\n\nSince the coins are valued at 4.80:  0.25x + 0.10y = 4.80\n\n              x + y = 30\n0.25x + 0.10y = 4.80\n\nMultiply top equation by -10 and bottom equation by 100.\n\n               -10(x + y = 30)\n100(0.25x + 0.10y = 4.80)\n\nAdd the resulting equations together.\n\n-10x -10y = -300\n 25x +10y = 480\n 15x          = 180\n              x =  12\n\nPlug in 12 for x in the top equation.\n\n12 + y = 30\n        y = 18\n\nThus, there are 12 quarters and 18 dimes.\n\nExample 2:  Ron, an alchemist, has two acid solutions.  One solution contains 20% acid \n                    and the other contains 30% acid.  How many liters of each should be mixed \n                    to obtain 100 liters of 26% acid solution?\n\nx = liters of 20% solution\ny = liters of 30% solution\n\nSince there are 100 liters total:  x  + y = 100\n\nFind the amount of acid in each base.\n0.20x = acid in 20% solution\n0.30y = acid in 30% solution\n0.26(100) = 26 = acid in mix\n\nSince the individual acids must add to total acid:  0.20x + 0.30y = 26\n\n              x + y = 100\n0.20x + 0.30y = 26\n\nMultiply top equation by -30 and bottom equation by 100.\n \n\n\n              -30(x + y = 100)\n100(0.20x + 0.30y = 26)\n\nAdd resulting equations together.\n\n-30x + -30y = -3000\n   20x + 30y = 2600\n-10x             = -400\n                  x = 40\n\nPlug 40 in for x in the top equation.\n\n40 + y = 100\n        y = 60\n\nThus, there are 40 L of 20% acid solution and 60 L of 30% acid solution.\n\nExample 3:  Dean invests $5000 in two different accounts paying simple interest.\n                     At the end of the year, Dean made $140 in interest.  If some of the \n                     money was at 4% and some of the money was at 2%, how \n                     much money was originally invested in each account?\n\nx = money at 4%\ny = money at 2%\n\nSince the money invested totals 5000:  x + y = 5000\n\nSimple interest for each account:\n0.04x = interest for 4% account\n0.02y = interest for 2% account\n \nSince total interest is 140:  0.04x + 0.02y = 140\n\n               x + y = 5000\n 0.04x + 0.02y = 140\n\nMultiply top equation by -2 and bottom equation by 100.\n\n                -2(x + y = 5000)\n100(0.04x + 0.02y = 140)\n\nAdd resulting equations together.\n\n-2x - 2y = -10000\n 4x + 2y = 14000\n 2x         = 4000\n            x = 2000\n\nPlug in 2000 for x in the top equation.\n\n2000 + y = 5000\n            y = 3000\n\nThus, $2000 was invested at 4% and $3000 at 2%.\n\nExample 4:  A rectangular garden has a perimeter of 190 ft.  If the length is 5 ft more \n                   than twice the width, find the dimensions. \n\nRecall, the perimeter of a rectangle is found by the formula 2L + 2W = P.\nSubstituting 190 in for the perimeter gives the equation \n\n2L + 2W = 190.\n\nAnother equation results from the statement, the length is 5 ft more than twice the width.\n                                                                                  L   =  5         +           2 ·          W\n\n2L + 2W = 190\nL = 5 + 2W\n\nSolve by substituting 5 + 2W in for L in the top equation.\n\n2(5 + 2W) + 2W = 190\n  10 + 4W + 2W = 190\n            10 + 6W = 190\n          -10               -10\n                    6W = 180\n                      W = 30\n\nSubstitute 30 in for W in the bottom equation.\nL = 5 + 2(30) = 5 + 60 = 65\n\nThus, the dimensions are 30 ft y 65 ft.\n\nExample 5:  Mary is selling scientific and graphing calculators.\n                   Each scientific calculators costs $15 each, and each \n                   graphing calculator costs $95 each.  Today, Mary \n                   sells 25 calculators for a total of $1175.  How many \n                   of each type of calculator
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b-a, at least if it is mathematics
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lol\n\nit's just b+1\n\nthat's it....an algabraic expression is an expression that consists of a variable.
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My openion is that "C" answer is correct.
320314
Gives the answerer easy 2 points
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the answer is\n2Al + N2 ----> 2AlN
901198
answer is 3s. any no. multiply by 1 is the no. itself.
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ok, this is found in the 4th quadrant, the order is as follows\n\n(x,y) 1st\n(-x,y) 2nd\n(-x,-y) 3rd\n(x,-y) 4th\n\nhope this helps\n\nmatttlocke
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Hint: the three side are equal long.\n\nTh
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9. B\n10. B\n11. It's 0.3455\n12. C
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The one next to the correct answer
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its (x+2)(3x+1) now thats rite lol
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ya it is a^2 +b ^2 +2abcos(c)
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An equation that is incorrect.
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no the correct answer will be\n(1/2)y^-5v^-12
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that is a good arithmatic question which many people get wrong. the answer would have to be 2
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in standard form yes, but thats not the whole answer, the answer would be x to the 2 power and -1