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You could be correct, Dragonlance......if so....I think we might have this formula :

0 = -4.9t^2 + 2.5t + 145

Solving this for t  produces.....

t = 5.7 s

I'd like to have some "Physics" person look at this.....I'm not sure which is correct  [ if either one is  !!!   ]

Actually CPhill it do make a difference. The package is moving up at 2.5 meters per second when it leave the helicopter. So it continue to move as gravity slows it down then it stop and goes down so it is higher up when it starts down. I not figure out how to do that yet. But I working on it :)

No prob, Solveit.....!!!!

Eh...it's no big deal.......we knew what you meant, anyway....!!!!

I believe that the helicopter's rate of ascent is irrelevant......at the time of release, the package is 145m above the ground instantaneously....so we have

145  = 4.9t^2     divide both sides by 4.9

145/4.9    = t^2      take the square root of both sides

t = about 5.44 s

Thanks CPhill i understood everything !

A helicopter is ascending vertically with a speed of 2.50 m/s. At a height of 145 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?

Use Galileo's famous formula for falling bodies: D=1/2.g.t^2, where D=distance the object falls, g=9.81 m/sec^2, the pull of gravity, t=time it takes the object to hit the ground.

Thanks CPhill for correcting me. I'm a lousy typist and too lazy to re-ckeck my "typing".

Yeah......I see what you mean.....

Looking at your approach....you could  compute this as :

1  - [Probability that neither pass ]  =

1 - [ .7  *  .6]  =  1  - .42   = .58

Does that make sense ???

You would make a monthly payment of $88.85, which includes principal + interest:

$88.85 X 12=$1,066.20, which is $1,000 principal + $66.20 interest, or "c"

The formula you would use to calculate this is:

PMT=PV. R.{[1 + R]^N/ [1 + R]^N - 1}=PMT NEEDED TO PAY OFF A LOAN OF $1, Where R=Interest rate per period, N=number of periods, PMT=periodic payment. PV=Present value.

The exponent in guest's answer  was probably a mis-type.....it should be " -1 " rather than " - 11"

my answer is correct but not the way 

Yep......you're exactly correct !!!!!!

4500 ( 1 + .0725/365) ^(5*365)   = about 6465.89   (b)

but what i found then ? :(

Let's see, Solveit.....

P(A and B)  = P(A) * P(B)   [  if A, B  are independent events  ]

"At least one" means that we have three possibilities:

Let A  = probability that Tom passes= .3  and B = probability that  John passes = .4

Both pass  =  P (A and B)  = .3 * . 4  = .12

Tom passes, and John doesn't = P (A and not B) =.3 * .6  = .18

John passes and Tom doesn't  = P(not A and B)  = .7 * .4   = .28

Summing these, we have    .12 + .18 + .28  =  .58    (D)

"Top Heavy" has a couple of meanings:

1- it means having the top disproportionately heavy; liable to fall from too great weight above.

2-In Finance:

It means having a financial structure overburdened with securities that have priority in the payment of dividends. or, overcapitalized.

LOL!

independent it is mean: Tom or John will pass the exam not both 

T-   3/10

J-    4/10 

the probability that they will pass is 3/10+4/10=7/10=0.7

the probability that they will both pass is 3/10x4/10=12/100=0.12

0,7-0.12=0.58 (D)

just a stupid question or my answer is wrong

Pretty Post Guest!

5.4 times 2 and 1/3

5.4 X 2 1/3=

5.4 X7/3=

37.8 / 3=12.6

I am almost positive you just wrote down numbers?

i found 0.58 answer

IDK, I wasn't payin much attention too spelling... Why did you put HiLow?