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Mathematics 7 Online
OpenStudy (anonymous):

What is the equation of the plane that contains the triangle shown in the diagram? CHOICES: A) 2x + 5y + 4z = 0 (this one was wrong) B) 2x + 5y + 4z= 1 C) 10x + 4y + 5z = 1 D) 10x + 4y + 5z = 20 I think the answer is B but I'm not sure if I'm working out the formula correctly: 2 - 5 = -3 - 3 + 4 = 1 ??? [URL=http://s790.photobucket.com/user/MoGoYo480/media/Udd_zpsf1f17846.jpg.html][IMG]http://i790.photobucket.com/albums/yy186/MoGoYo480/Udd_zpsf1f17846.jpg[/IMG][/URL]

OpenStudy (anonymous):

In the diagram below, AC is perpendicular to BD. Find x. 18 27 36 - wrong 81

OpenStudy (anonymous):

I need step by step instruction in simple terms on how to find x. I came up with 63 but that wasn't a choice. 9 - 90 = 81 3 / 81 = 27 2 x 27 = 54 54 + 36 = 90 27 + 36 = 63 <--wrong

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