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# Recent problems solved by 'smartdude17'

 Quadratic_Equations/4115: Find the vertex and intercepts for each quadratic function. Does it open up or down? y = -3x^2 + 6x 1 solutions Answer 1817 by smartdude17(30)   on 2005-06-26 18:42:24 (Show Source): You can put this solution on YOUR website!Your problem is easy, even a 7th grader can do it. The intercepts are 2 and 0. You get it by doing the QF. You find the vertex by also using the QF. To find a vertex use : -b/2a. In this case the answer is 1. So, your parabola, or parabolic curve, is turned downward.
 percentage/3948: What is 10% of \$35.00 and What is 10% of \$30.00? Also what is 10% of \$15.00?1 solutions Answer 1733 by smartdude17(30)   on 2005-06-21 16:56:48 (Show Source): You can put this solution on YOUR website!This one is easy! My teacher told me a little saying. When multiplying by a 10, move the decimal one place to the left. But this only works on tens. Answer is: 3.5 , 3.0 , and 1.5
 Circles/3929: What is the radius of a circle with a diameter of 8 inches?1 solutions Answer 1732 by smartdude17(30)   on 2005-06-21 16:47:16 (Show Source): You can put this solution on YOUR website!Usually the diameter is across the circle-meaning the radius is 1/2 of the diameter,therefore it equals 4.
 Miscellaneous_Word_Problems/3938: The product of the first twelve positive integers is divisible by all of the following EXCEPT (A) 210 (B) 88 (C) 75 (D) 60 (E) 34 1 solutions Answer 1731 by smartdude17(30)   on 2005-06-21 16:38:55 (Show Source): You can put this solution on YOUR website!The answer to this is: 34.
 Quadratic_Equations/3944: Find the y-intercepts and any x-intercepts. y=2x^2+6x-201 solutions Answer 1730 by smartdude17(30)   on 2005-06-21 16:23:22 (Show Source): You can put this solution on YOUR website!After you do all the busy work, it comes to this: x=-5,2 and y=0
 Quadratic_Equations/3733: find the possible value or values of y in the quadratic equation 1 solutions Answer 1729 by smartdude17(30)   on 2005-06-21 12:16:33 (Show Source): You can put this solution on YOUR website!The answer is a rational: This is what i have got. good luck.
 Linear-equations/3922: Please solve: 2x^2+3-1=0 by using quadratic formula1 solutions Answer 1728 by smartdude17(30)   on 2005-06-21 11:43:44 (Show Source): You can put this solution on YOUR website! Look, if you do the quadratic formula, you'll end up with having to take a square root of a negative number. That's undefined (no solutions) unless you are studying complex (imaginary) numbers.
 Quadratic_Equations/1931: y=-3x^2+2x+7 I am still a little lost on this type of problem.1 solutions Answer 803 by smartdude17(30)   on 2005-05-12 16:16:57 (Show Source): You can put this solution on YOUR website!I am going to show you step by step: y=-3x^2+2x+7 After you do all the substitutions. Since this technology doesn't let me do the work without showing ERROR. I am going to show you the answers. x= -40/19 (-2 2/19), 21/19 (1 2/19)
 Polynomials-and-rational-expressions/1922: z(5z-1)=3z(z+3) "solve by suitable methods"....whatever that means. :)1 solutions Answer 739 by smartdude17(30)   on 2005-05-11 17:50:49 (Show Source): You can put this solution on YOUR website!z(5z-1)=3z(z+3) Well, first you need to clear parenthesis. 5z^2-z=3z^2+9z Invert to = the formula. 2z^2=10z Now you invert 10z so it resembles the formula. 2z^2-10z=0 Do QF. AFTER YOU DO THE WORK (THIS THING KEEPS SAYING I DID IT WRONG!) THE ANSWER =: z=5,0 Let's Check! 5(25-1)=15(8) 120=120 0(0-1)=0(0+3) 0=0
 Inequalities/1920: I am working on solving this inequality and could really use some help. (x-3)/(x+4)>2 Thanks :)1 solutions Answer 737 by smartdude17(30)   on 2005-05-11 17:41:47 (Show Source): You can put this solution on YOUR website!(x-3)/(x+4)>2 Multiply everything by CD. Change sign to =. (x-3)/(x+4)=2](x+4) Simplify. x-3=2x+8 Finish the equation. -11=x, -11< x (-10-3)/(-10+4)>2 -13/-6 > 2 2 1/6 > 2 IT CHECKS.
 Quadratic_Equations/1883: x^2-5x=141 solutions Answer 736 by smartdude17(30)   on 2005-05-11 17:36:37 (Show Source): You can put this solution on YOUR website!x^2-5x-14=0 Invert 14 into quadratic form. Foil or do formula. (x+2)(x-7)=0 In this case, it was easy to foil so I did that. x+2=0 x-7=0 x= -2 & 7 LET'S CHECK. -2^2-5(-2)=14 4+10=14 14=14 7^2-5(7)=14 49-35=14 14=14
 Quadratic_Equations/1697: Solve the inequality, state the solution set using interval notation 1/2x^2 is greater than/or equal to 4-x 1 solutions Answer 617 by smartdude17(30)   on 2005-05-09 17:56:47 (Show Source): You can put this solution on YOUR website!1/2x >/= 4-x 1/2x = 4-x]2 x=4-x 2x=4 x=2 x >/= 2 1/2(4) > 4-4 2>0 This is your answer. I am sorry but I don't understand what you mean by interval notation. Sorry. Hope it helps!
 Quadratic_Equations/1723: solve for x x^2+3x+3=01 solutions Answer 616 by smartdude17(30)   on 2005-05-09 17:50:49 (Show Source): You can put this solution on YOUR website!The answer is easy, it is no. See: x^2+3x+3=0 When you substitute all of the numbers it comes to a sqrt of a -3. You cannot get a sqrt of a -3. So the answer is no.
 Quadratic_Equations/1791: When using the quadratic formula what if the answer does not equal 0 like this one; -x + 6 = 5x^21 solutions Answer 614 by smartdude17(30)   on 2005-05-09 17:42:08 (Show Source): You can put this solution on YOUR website!-x+6=5x^2 Invert to formula 0=5x^2+x-6 Solve regularly x= -6/5, x= 1 These are your answers. They should check. Let's see: 0=5(1)^2+1-6 0=0 This checks. Let's try the next one: 0=5(-6/5)^2-6/5-6 0=0/5 This also check because 5 goes into 0, 0 times. After this work, mabey you did something wrong like mabey you made a sign error.
 Linear-equations/1794: solve 3p/2 - 5p/3=1/51 solutions Answer 610 by smartdude17(30)   on 2005-05-09 16:08:47 (Show Source): You can put this solution on YOUR website!3p/2-5p/3=1/5](2)(3)(5) 45p-50p=6 -5p=6 -5p/5=6/5 p=-6/5