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I googled your equation (H(t) = 1/2(-9.8)t^2 + 49t + 2.5) and it gave me the answer in this .pdf. Here's the link:http://www.lessonlink.com/documents/da2/ParentGuide/DA_PG_09.pdf

I got this...http://www.addictinggames.com/papercannon.html

use the quadratic formula to solve for 't'.x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}, I have no idea what that says; so, i would just google quadratic formula. You should get 2 quantities. The starting point and when it hits the ground. a=t^2b=tc=scaler

I'm in the position of having to tutor my 13 year old in Algebra. I used to be pretty good at this crap, but it's been a llllllooong time.I understand generally how to solve quadratic equations, but there are some word problems I CAN'T do, like this:A small rocket is fired from the ground. H(t) = 1/2(-9.8)t^2 + 49t + 2.5 describes the rocket's projectile motion. Approximately how many seconds does it take for the rocket to return to the ground?I started with this: 0(t) = -4.9t^2 + 49t + 2.5 I think this needs to be factored in order to come up with two values for t, one of which will be tossed out because it will be negative, but I'm lost. WTF?Can anyone show me how to finish this so I can TRY to explain it to my 8th grader? Please?

You suck.

Got it. It really was a simply as plugging a, b & c into the formula. Duh. Thanks!

Can't have negative time.

I got all the way through AP Calculus in high school. Then I aced college algebra and trig my first year in college. Never had a problem with math at all.Then I tried to go back 13 years later and take pre-engineering courses, the first math course of which is Calculus 1. I failed miserably. It ain't like riding a bike.

How in the world did you take AP Cal in HS but have to take college algebra and trig in college??? Trig is about 2 years before Cal at the HS level

I made a B on my college algebra final. Happiest day of my 7 yr on/off college career.

I took Algebra 1 threve times at the UA and I still have nofaking clue what to do with that mess. How I made it through survey of cal is truly one of life's great mysteries.