#11




And after looking at the first one, I made a rookie mistake there.
It takes pipe A, running alone, 18 hours to fill the tank. It takes both pipes, running together, 9.9 hours to fill the tank. How long does it take pipe B, running alone, to fill the tank?  A DATA: time = 18 hrs/job ; rate = 1/18 jobs/hr  A/B DATA: time = 9.9 hrs/job ; rate = 1/9.9 job/hr  B DATA: time = x hrs/job ; rate = 1/x job/hr  Equation: rate + rate = together rate 1/18 + 1/x = 1/9.9  9.9x + 9.9*18 = 18x 8.1x = 9.9*18 x = 22 hrs (time required by the B pipe to fill the tank) Give me some slack, schools out. xD 
#12




I'm too goodlooking to know these stuff.

#13




Quote:

#14




So thaaaat's why I failed math.

#15




Np. I took Alg2AP this year and got an A, so I SHOULD know this. xD

#16




How do I find the acute angle between y=2x and y=2x?

#17




Well you'd have to look for it I guess. When was the last time you saw it? And you've checked it's not in any of your pockets right?

#18




If you're serious, what you want to do is draw a third line to make a right triangle. It should be the reciprocal of one of the lines if I remember correctly. Then find the distance of two of the sides of the triangle, and then use trig to find the angle needed.
BUT, the two equations you gave me don't form an acute angle, they form an angle of 120 degrees, an obtuse angle. So technically you're question is obsolete or I'm a complete retard. 
#19




Quote:

#20




Nvm.


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