# Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 70310: (x+3)^3 this should be clubed. factor and give result please. i beleve that the book is wrong. it says the answer is x squared plus 6x plus 9. Click here to see answer by stanbon(57956)

 Question 70462: Evaluate the following expressions when a = -3, b = -1, c = 5: -a2c + bc Click here to see answer by checkley75(3666)

 Question 70472: Use the distributive property to remove the parentheses in this expression. Then simplify by combining like terms. 7(4w - 3) - 25w= The furthest I got is: 7*4w-7*3-25w= If this is right what do I do next? Click here to see answer by stanbon(57956)
 Question 70472: Use the distributive property to remove the parentheses in this expression. Then simplify by combining like terms. 7(4w - 3) - 25w= The furthest I got is: 7*4w-7*3-25w= If this is right what do I do next? Click here to see answer by josmiceli(9817)

 Question 70464: In 1999, the US produced about 2 million more motor vehicles than Japan. Together, the two countries produced about 22 million motor vehicles. how may vehicles were produced in each country? Click here to see answer by checkley75(3666)

 Question 70470: I have tried and tried to figure this out with no luck. The furthest I got was 15x^2y^3 over 3x^2y^2 Simplify the following expression where possible. 6x^2y^3+9x^2y^3 over 3x^2y^2 Click here to see answer by stanbon(57956)
 Question 70470: I have tried and tried to figure this out with no luck. The furthest I got was 15x^2y^3 over 3x^2y^2 Simplify the following expression where possible. 6x^2y^3+9x^2y^3 over 3x^2y^2 Click here to see answer by Earlsdon(6294)

 Question 70545: Nancy jogs and walks to school every day. She does 4km/h walking and 8km/h jogging. From home to school it is 6km and it is an 1 hour trip. Using substitution how far does Nancy jog? Click here to see answer by funmath(2925)

 Question 70721: If x - 9 ________ = 3 How, by what process, do you solve for x? Thanks, frank x + 4 Click here to see answer by checkley75(3666)
 Question 70721: If x - 9 ________ = 3 How, by what process, do you solve for x? Thanks, frank x + 4 Click here to see answer by bucky(2189)

 Question 70755: ```x-3 + y+5 =11/6 ____ ____ 2 3 ``` I am having a hard time getting this formatted the right way. The 3 should be under y+5 Click here to see answer by jim_thompson5910(28704)

 Question 70754: x-3 + y+5 = 11/6 ---- ---- 2 3 Click here to see answer by bucky(2189)

 Question 70756: A merchant wants to mix gummy worms worth \$3 per pound and gummy bears worth \$1.5 per pound to make 30 pounds of a mixture worth \$2.10 per pound. how many pounds of each type of candy should he use. Click here to see answer by checkley75(3666)

 Question 70750: how do you solve the elimination method? -2x+4y=12 3x-2y=-10 Click here to see answer by checkley75(3666)

 Question 70703: Can you provide some assist in helping solve this problem...instructions...solve the system by addition or substitution. 4x - 4y = 24 y = -6 + x Click here to see answer by stanbon(57956)

 Question 70907: Find the two-digit number whose tens digit is 3 less than the units digit. The original number is 6 more than 4 times the sum of the digits. Click here to see answer by mathmaven53(29)

 Question 70908: A chemist has a solution that is 20% peroxide and another solution that is 70% peroxide. She wishes to take 100 L of a solution that is 35% of peroxide. How much of each solution should she use? Click here to see answer by mathmaven53(29)

 Question 70905: A coin bank contains nickels, dimes, and quarters totaling \$5.45. If there are twice as many quarters as dimes and 11 more nickels than quarters, how many of each coins are in the bank? Click here to see answer by mathmaven53(29)

 Question 70910: If f (x) = 4x-3, find the following: f(-1) Click here to see answer by bucky(2189)

 Question 70904: A banker invested a portion of \$10,000 at 5% interest per year and the remainder at 4% interest per year. If the banker recieved \$470 in interest after one year, how much was invested at each rate? Click here to see answer by mathman409(67)

 Question 70959: Hi, I am trying to solve this Equation that determins my rating. My rating is 1969 and the oppoenents rating is 1958. My rating went down to 1857 (that is 112 point drop is the ranking) and I am thinkng the computer mis-caluated the formula. The final score was 391 to 277. I can email the formula to you as it is using - square roots, and multiple variables. hope to here from you soon :) Click here to see answer by mathman409(67)

 Question 71034: During rush hour, Adriana can drive 20 miles using the side roads in the same time that it takes to travel 15 miles on the freeway. If Adriana's rate on the side roads is 10 mi/h faster than her rate on the freeway, find her rate on the side roads. Click here to see answer by checkley75(3666)

 Question 71033: Are the following lines parallel, perpendicular, or neither? L1 with equation x – 2y = 10 L2 with equation 2x + y = 2 Click here to see answer by checkley75(3666)
 Question 71033: Are the following lines parallel, perpendicular, or neither? L1 with equation x – 2y = 10 L2 with equation 2x + y = 2 Click here to see answer by bucky(2189)

 Question 71030: Rewrite the equation –8x – 5y = –45 as a function of x. thank you. Click here to see answer by checkley75(3666)

 Question 71029: Solve. 6x + 4(3x – 2) = 6x + 2 Click here to see answer by checkley75(3666)
 Question 71029: Solve. 6x + 4(3x – 2) = 6x + 2 Click here to see answer by Alg_Whiz_Kid(6)
 Question 71029: Solve. 6x + 4(3x – 2) = 6x + 2 Click here to see answer by mathman409(67)

 Question 71032: The demand and supply equations for a certain item are given by D = –5p + 40 S = –p2 + 30p – 8 Find the equilibrium price Click here to see answer by stanbon(57956)

 Question 71028: Solve the system by graphing. 3x – y = 1 3x – y = 2 thanks Click here to see answer by checkley75(3666)
 Question 71028: Solve the system by graphing. 3x – y = 1 3x – y = 2 thanks Click here to see answer by Alg_Whiz_Kid(6)

 Question 71027: Stan invested \$5,000, part at 8% and part at 17%. If the total interest at the end of the year is \$490, how much did he invest at 8%? thank Click here to see answer by checkley75(3666)
 Question 71027: Stan invested \$5,000, part at 8% and part at 17%. If the total interest at the end of the year is \$490, how much did he invest at 8%? thank Click here to see answer by bucky(2189)

 Question 71024: Find the slope of the line passing through the points (10, –4) and (–4, –4). Click here to see answer by Alg_Whiz_Kid(6)

 Question 71026: The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 52 in., find the width of the rectangle. Click here to see answer by checkley75(3666)
 Question 71026: The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 52 in., find the width of the rectangle. Click here to see answer by mathman409(67)

 Question 71025: A plane took 1 hour longer to travel 560 miles on the first portion of a flight than it took to fly 480 miles on the second portion. If the speed was the same for each portion, what was the flying time for the second part of the trip? Click here to see answer by mathman409(67)

 Question 71023: A rectangular garden is to be surrounded by a walkway of constant width. The garden's dimensions are 30 ft by 40 ft. The total area, garden plus walkway, is to be 1800 ft2. What must be the width of the walkway to the nearest thousandth? Click here to see answer by stanbon(57956)
 Question 71023: A rectangular garden is to be surrounded by a walkway of constant width. The garden's dimensions are 30 ft by 40 ft. The total area, garden plus walkway, is to be 1800 ft2. What must be the width of the walkway to the nearest thousandth? Click here to see answer by checkley75(3666)

 Question 71148: 5 1 ____ + ___ =0 2X+3 X-6 SOLVE 5 OVER 2X+3 + 1 OVER X-6 = 0 THANK YOU CAROL Click here to see answer by Earlsdon(6294)

 Question 71157: 10y^2+9y+2 i cannot find anyone to help me with this whole problem factoring polynomials can ;you help me p;ease? thanks Click here to see answer by Earlsdon(6294)

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