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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 609887: Susan purchased a shirt with a 25% off coupon she paid 45\$ for the shirt. Wwhat was the original price Click here to see answer by richwmiller(9135)

 Question 609888: The acceleration of an object varies directly as the force acting on it. If a force of 240 newtons causes an acceleration of 150 m/sē, what force will cause an acceleration of 100 m/s2? Click here to see answer by stanbon(57246)

 Question 609968: -2 + 4y = 12 5x - 2y = 10 Click here to see answer by flame8855(424)

 Question 609957: Parking in a student lot costs \$2 for the first half hour and \$1.25 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest a student can park in this lot for \$9? Click here to see answer by rfer(12647)

 Question 610247: Help me with my homework please. The finals are next week and I really don't want to fail. Please! Click here to see answer by jim_thompson5910(28504)

 Question 610265: I am studying for my GED test and I am stuck on allgebra just can't get it Click here to see answer by rfer(12647)

 Question 610442: http://www.illiniwest.org/vimages/shared/vnews/stories/49d279d35e563/Notes%20Ch%2012.3.pdf My answers for the last two problems, 13 and 14, are 203.6 cm^2 and 307.8 in^2. Are they correct? If not please correct me and explain. Thanks in advance! Click here to see answer by Alan3354(30983)

 Question 610306: two similar cylindrical juice containers have a scale factor of 2:3. To make juice in the smaller container, you use 1/2 cup of concentated juice and fill the rest with water. Find the amount of concentrated juice needed to make juice in the larger container. (Hint: Start by finding the ratio of the volumes of the containers.) Please help me with this. I found the ratio of the volumes of the containers, which is 8:27, but I'm lost at what to do next. Please help me and explain. Thanks in advance! Click here to see answer by sudhanshu_kmr(1152)

 Question 610714: Age of father is '4x' when his son is 'x' years old. When son is '5x' what will be the age of father? Click here to see answer by flame8855(424)

 Question 610819: A roller skating rink charges an admission fee of \$5 for members and \$10 for non-members. One day it made at least \$300. Which of these combinations could have come that day? Click here to see answer by math-vortex(472)

 Question 610900: I have to takea graduation test of algebra tommorow an I took this class last year i just need help to refresh my memory Click here to see answer by solver91311(16868)

 Question 610958: The sum of 2 numbers is 47 and their difference is 13. What are the numbers ? Click here to see answer by radh(108)

 Question 611016: Can you teach me how to factor and how to solve x for quadratic equations? Click here to see answer by Edwin McCravy(8882)

 Question 611014: Can you teach me how to factor and how to solve for x in quadratic equations? Click here to see answer by Edwin McCravy(8882)

 Question 611111: Simplify: 3x^2 - 19x -14  6x^2 - 11x - 10 Click here to see answer by vleith(2825)

 Question 611165: How many ways can 3 people selected from 7 be arragned in a row of chairs? 336 210 35 None Click here to see answer by ewatrrr(10682)

 Question 611303: X^2-x=12 We have worked answer out to be 4 but can't show working as to how we got there could u help?? Click here to see answer by Alan3354(30983)

 Question 611335: How many solutions exist for the system of equations? 2x-3y=14 4x-6y=21 Click here to see answer by ewatrrr(10682)

 Question 611356: There are 7 people and 2 people get chosen there are 3 boys and 4 girls how many combinations if there both girls Click here to see answer by jim_thompson5910(28504)

 Question 611509: Find the partial fraction decomposition for each rational expression. (11-2x)/(x^2-8x+16) Click here to see answer by jsmallt9(3296)

 Question 611160: I've missed a lot of school because I've been sick and I'm trying to get all of my work done. The notes and books don't explain how to do all of the problems really well and I need help with the following questions. Please explain to me how to get the answers. Thanks! 1. Which of the following is a quadratic equation that has roots of 2 1/2 and 2/3? A) 5x^2 + 11x - 7 = 0 B) 6x^2 - 19x + 10 = 0 C) 5x^2 + 11x - 10 = 0 D) 6x^2 + 19x - 10 = 0 2. Which system has infinitely many solutions? A) y = 2x + 6 y - 8x = 21 B) 4x - 4y = 4 x - y = 1 C) 4x + 2y = 5 x - 2y = 9 D) none of these 3. Which describes the number and type of roots of the equation x^3 - 4x^2 + 50x + 7= 0? A) 1 positive, 2 negative B) 2 positive, 1 negative C) 3 negative D) 3 positive 4. Evaluate i^14. A) i B) -1 C) -i D) 1 5. Solve w^4 + 2w^2 - 24 = 0. 6. What type of polynomial is 79x^9? A) monomial B) binomial C) trinomial D) none of these 7. Find the solution for the determinant. 1 20 5 -5 A) 100 B) 105 C) -105 D) -95 8. Find the solution for the determinant. -4 2 8 -10 A) 24 B) -56 C) 56 D) -24 9. The result of multiplying a 2x3 matrix and a 3x4 matrix is a 2x4 matrix. A) True B) False 10. ____________________ uses determinants to solve systems of equations. A) elimination B) substitution C) graphing D) Cramer's Rule 11. In order to _______ matrices, you must always have the same dimensions. A) multiply B) add C) invert D) none of these 12. It is not possible to multiply a 2x5 matrix and a 5x4 matrix. A) True B) False 13. When using Cramer's Rule to solve the system of equations containing 2x - y = 1 -4x + 3y = 0 the numerator for the y variable looks like which determinants? 14. Solve by completing the square x2 - 6x - 4 = 0. 15. When using Cramer's Rule to solve the system of equations containing 5x - y = 5 -3x + y = -9 the denominator for the x and y variables looks like which of these determinants? 16. What kind of solutions does ax^2 - bx + c = 0 have if b^2 - 4ac < 0? A) two real solutions B) two complex solutions C) one complex solution D) one real solutions 17. What type of polynomial is -25x4 - 21? A) monomial B) binomial C) trinomial D) none of these 18. Use synthetic substitution to find f(-2) for f(x) = x4 - 4x3 - 4x + 6 A) 22 B) 56 C) 62 D) 32 19. It is possible to multiply a 3x4 matrix and a 2x2 matrix. A) True B) False 20. When using Cramer's Rule to solve the system of equations containing 3x - 6y = 9 4x + 2y = -6 the numerator for the x variable looks like which of these determinants? 21. Solve by completing the square x2 - 2x - 5 = 0. 22. If y = 4x + 14, what is the value of y ũ -4? 23. What is the solution to the system containing these equations? y = x + 5 x + y = 9 24. It is not possible to add a 2x4 matrix and a 4x2 matrix. A) True B) False 25. Solve by completing the square 3x2 - 8x - 6 = 0. 26. Solve the quadratic equation x2 + 8x + 12 = 0. 27. If x + 3y = 12 and 2/3X- y = 5, what is the value of x? 28. One factor of x3 - 3x2 - 4x + 12 is x + 2. Find the remaining factors. 29. What is the solution for the determinant? 1/2 -4 -1/4 -2 30. What type of polynomial is 5x^2 - 11x + 2? 31. Which value is the sum of the solutions to x^2 - 3x - 18 = 0? Click here to see answer by jsmallt9(3296)