A Daredevil Jumps Off A Tall Building. He Falls Freely For Several Seconds Before Releasing His Parachute . His Height (h) In Meters , T Seconds After Jumping Can Be Modeled By : h=-4.9t^2+t+360 before he releases his parachute and h=-4t+142 After He Releases His Parachute . How Long After Jumping Did He Release His Parachute ? HELPP ME PLEASE !!!! @imqwerty

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A Daredevil Jumps Off A Tall Building. He Falls Freely For Several Seconds Before Releasing His Parachute . His Height (h) In Meters , T Seconds After Jumping Can Be Modeled By : h=-4.9t^2+t+360 before he releases his parachute and h=-4t+142 After He Releases His Parachute . How Long After Jumping Did He Release His Parachute ? HELPP ME PLEASE !!!! @imqwerty

Algebra
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The height functions will be equal when he releases the parachute \[-4.9t^2+t+360=-4t+142\] Make one side equal to 0 and use the quadratic equation to solve
He falls for218 meter
How ?

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Other answers:

Are u asking me?
im asking whoever can help me solve thus problem
Do you know the quadratic equation?
No But I Know How To Do The Formula
sry, I meant formula
The equation is in my first post
Oh Yea i Had That
what do you have?
-4.9t^2 + t +360 = 4t +142
Thats All I Have I Dont Know The Next Step.
It should be -4t + 142 on the right side. the next step is to make one side be 0 by adding or subtracting everything on that side of the equation. You have -4t on the right side. How would you move it from the right to the left?
Can You Please Explain
By Drawing So I Can Get A Visual Picture .
Is one of these what you want? Not really sure what you're asking for?|dw:1439936124822:dw| |dw:1439936251767:dw|
So Where It Says Add Or Subtract ?
ill subtract the 4t
You want to add the 4t because it's actually -4t (at least it is in the original problem statement). Whatever the sign is, do the opposite
Ok Can You Draw It Out ?
|dw:1439936950147:dw|
Right Right There It Is
AND Now I Do The Formula .
Correct ?
yeah, what did you get as the equation though? I left the addition/subtraction for you to do
-4.9t^2 + 364 -142=0
I aligned the terms so you can actually add straight down. What's\[t+4t=\] and \[360-142=\]
4t^2 and 218
t + 4t = 5t (add the coefficients, never change the exponents when adding or subtracting). So this is the equation |dw:1439937754826:dw|
I Plugged Them In.
ok. what did you get for t?
x=-6 x2=7
yeah, closer to -6.2 and 7.2?
Yeah
Do You Mind Helping Me Again Ill Tag You If So
yeah
Ok

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