anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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
Plasmataco
  • Plasmataco
He falls for218 meter
anonymous
  • anonymous
How ?

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

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