anonymous
  • anonymous
can i get some help from anyone dats good wit word problems
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Write your question down!!
anonymous
  • anonymous
(h(t)=-16t^2+vt+c where h is the approximate height in ft t is the time in motion in seconds v is the initial upward velocity in ft per second and c is the initial height in ft) A baseball player hits a pitched ball when it is 4ft above the ground the initial upward velocity is 80ft/s how long will it take for the ball to hit the ground???
anonymous
  • anonymous
Consider the given equation h(t)=-16t^2+vt+c. We are looking to find t, where v=80ft/s and c=4ft. h(t) represents the height when it hits the ground, that's h(t)=0. So: \[0=-16t^2+80t+4 \implies -4t^2+20t+1=0 \] Now solve the quadratic equation for t. Take only the positive value.

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More answers

anonymous
  • anonymous
how did u get the 2nd equation
anonymous
  • anonymous
Divide both sides by 4.
anonymous
  • anonymous
ok so how do i get t
anonymous
  • anonymous
Use the quadratic formula. You will positive value t approximately 5.05 sec.
anonymous
  • anonymous
will get*
anonymous
  • anonymous
only answers it could be is 3s,4s or 2.2s cuz its one of those riddle papers
anonymous
  • anonymous
Let me check my answer.
anonymous
  • anonymous
i though 4 was h
anonymous
  • anonymous
>.< I don't know why 5 is not among the choices.
anonymous
  • anonymous
im trippen it is 5.1 on here can u tell me how i can get it cuz idk how 2 do dis
anonymous
  • anonymous
5.1 is there and you didn't say that? >.<
anonymous
  • anonymous
yes and i didnt notice till i looked at the riddle paper
anonymous
  • anonymous
:( I redid it like 6 times.
anonymous
  • anonymous
im sorry
anonymous
  • anonymous
can u still help me
anonymous
  • anonymous
lol it's ok.. what is it that you don't understand?
anonymous
  • anonymous
after i get t=-4t^2+20t+1 what do i do
anonymous
  • anonymous
You just solve the equation for t. Are you allowed to use a calculator?
anonymous
  • anonymous
yes
anonymous
  • anonymous
but how u solve 4 t
anonymous
  • anonymous
Okay, you can solve it by your calculator.
anonymous
  • anonymous
i need steps
anonymous
  • anonymous
\[t={-b \pm \sqrt{b^2-4ac} \over 2a}={-20\pm \sqrt{20^2+16} \over -8}\]
anonymous
  • anonymous
or you can just write the equation in your calculator and it will give you the answer directly.
anonymous
  • anonymous
i remember dat fromula but where u get -20 and -8
anonymous
  • anonymous
a=4, b=20, c=1. Plug them in the equation.
anonymous
  • anonymous
ok u have 2 understand i got like 11 more problems to do and im not understanding where u getting these numbers 4rm when it comes 2 math i gotta be talked 2 like im slow so i can pick it up quick u have 2 explain how u got a b c from dat word problem the only numbers i got from the equation is -16 80 and 4 so please explain
anonymous
  • anonymous
okay, then take a=-16, b=80 and c=4. That will work exactly the same.
anonymous
  • anonymous
y u make it so difficult u like my teacher just tell me the simple answer lol so do i use dat equation 4 all these problems
anonymous
  • anonymous
hmm okay focus now.
anonymous
  • anonymous
You told me you got the first equation. This is a quadratic equation, it can always be solved by the quadratic formula, which I wrote above. The question now is what a, b and c.
anonymous
  • anonymous
ok hold on dis cant go in my calculator when it has the +-
anonymous
  • anonymous
a is the coefficient of t^2, b is the coefficient of t, and c is the constant.
anonymous
  • anonymous
just do it once with the minus, and another time with the plus.
anonymous
  • anonymous
and then take from the two final answers, the positive one.
anonymous
  • anonymous
wat was wrong with the formula they gave me dis is pissing me off
anonymous
  • anonymous
I don't know!
anonymous
  • anonymous
ok look can u tell me how to do it just using the formula they gave me i dont like dat other one it wont go in my calculator and im getting way 2 mad 2 focus
anonymous
  • anonymous
I just told you. can you please help here, at least by reading what I write?
anonymous
  • anonymous
i did read wat u wrote but u not giving me step by step instructions may be natrual 2 u but it aint 2 me im good but slow at it so all i need is someone 2 break it down one good time instead of giving me alot of info without working it completly out
anonymous
  • anonymous
Where exactly is your problem?
anonymous
  • anonymous
i dont know how to use h(t)=-16t^2+vt+c
anonymous
  • anonymous
whoops you mean the very beginning? I don't think I can help you here. I am a little bit busy. I am so sorry. I really tried, but I might be not good at explaining things.
anonymous
  • anonymous
ook
anonymous
  • anonymous
Good luck!! :)
anonymous
  • anonymous
i keep getteing 50.9 i finally figured out wat u was saying
anonymous
  • anonymous
Good to know that :)
anonymous
  • anonymous
can u help me e 5.1 answer cuz i guess im putting dis in the calculator wrog im not getting 5.1
anonymous
  • anonymous
once i use the formula u gave me is there a step after dat 2 get the 5.1
anonymous
  • anonymous
No, you have just to use your calculator correctly. Better to take it step by step, like start with the part under the square root.

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