Question

can i get some help from anyone dats good wit word problems

Answer 1

Write your question down!!

Answer 2

(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???

Answer 3

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.

Answer 4

how did u get the 2nd equation

Answer 5

Divide both sides by 4.

Answer 6

ok so how do i get t

Answer 7

Use the quadratic formula. You will positive value t approximately 5.05 sec.

Answer 8

will get*

Answer 9

only answers it could be is 3s,4s or 2.2s cuz its one of those riddle papers

Answer 10

Let me check my answer.

Answer 11

i though 4 was h

Answer 12

>.< I don't know why 5 is not among the choices.

Answer 13

im trippen it is 5.1 on here can u tell me how i can get it cuz idk how 2 do dis

Answer 14

5.1 is there and you didn't say that? >.<

Answer 15

yes and i didnt notice till i looked at the riddle paper

Answer 16

:( I redid it like 6 times.

Answer 17

im sorry

Answer 18

can u still help me

Answer 19

lol it's ok.. what is it that you don't understand?

Answer 20

after i get t=-4t^2+20t+1 what do i do

Answer 21

You just solve the equation for t. Are you allowed to use a calculator?

Answer 22

yes

Answer 23

but how u solve 4 t

Answer 24

Okay, you can solve it by your calculator.

Answer 25

i need steps

Answer 26

\[t={-b \pm \sqrt{b^2-4ac} \over 2a}={-20\pm \sqrt{20^2+16} \over -8}\]

Answer 27

or you can just write the equation in your calculator and it will give you the answer directly.

Answer 28

i remember dat fromula but where u get -20 and -8

Answer 29

a=4, b=20, c=1. Plug them in the equation.

Answer 30

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

Answer 31

okay, then take a=-16, b=80 and c=4. That will work exactly the same.

Answer 32

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

Answer 33

hmm okay focus now.

Answer 34

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.

Answer 35

ok hold on dis cant go in my calculator when it has the +-

Answer 36

a is the coefficient of t^2, b is the coefficient of t, and c is the constant.

Answer 37

just do it once with the minus, and another time with the plus.

Answer 38

and then take from the two final answers, the positive one.

Answer 39

wat was wrong with the formula they gave me dis is pissing me off

Answer 40

I don't know!

Answer 41

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

Answer 42

I just told you. can you please help here, at least by reading what I write?

Answer 43

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

Answer 44

Where exactly is your problem?

Answer 45

i dont know how to use h(t)=-16t^2+vt+c

Answer 46

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.

Answer 47

ook

Answer 48

Good luck!! :)

Answer 49

i keep getteing 50.9 i finally figured out wat u was saying

Answer 50

Good to know that :)

Answer 51

can u help me e 5.1 answer cuz i guess im putting dis in the calculator wrog im not getting 5.1

Answer 52

once i use the formula u gave me is there a step after dat 2 get the 5.1

Answer 53

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.