Question

HELP QUICKLY PLEASE!!! http://nimb.ws/hWiC3K

Answer 1

Yes, you are correct on b)

Answer 2

to c) just let it =125, then solve for t

Answer 3

ur good CX

Answer 4

I mean \(64+e^{-0.5t}=125\)

Answer 5

Thanks guys :)! But I am a bit bit confuse on how to find t. 64+144e^(-0.5t)=125 I got it's just the e^(-0.5t)

Answer 6

oh, mistake hehehe
ok,

Answer 7

-64 both sides, get what?

Answer 8

it seems someone will give you the answer for free. OOOOOOOOOOOK, good luck

Answer 9

You take ln of both sides to get rid of the e^(x), because ln(e^(x)) = x

Answer 10

If that helps...

Answer 11

lol it's okay . and 125-68= 58=144e^(0.5t) right?

Answer 12

It does thanks @aleroth :)

Answer 13

:) You are on the right path.

Answer 14

Except 125-68 = 57

Answer 15

Ah a mistype :P, Oh okay so I subtract 144 from both sides and divide -0.5t to find t?

Answer 16

Not quite. From here:
57=144e^(0.5t)

Divide both sides by 144:
57/144 =144*e^(0.5t)/144

Then take the logarithm of both sides:
ln (57/144) = ln(e^0.5t) = 0.5t

Then divide both sides by 0.5 (or multiply by 2) to get t alone:
2*ln(57/144) = t

Answer 17

I made a mistake the 0.5t is -0.5t would that change the answer?

Answer 18

Oh right, it would look like this instead:

Divide both sides by 144:
57/144 =144*e^(-0.5t)/144

Then take the logarithm of both sides:
ln (57/144) = ln(e^-0.5t) = -0.5t

Then divide both sides by 0.5 (or multiply by 2) to get t alone:
2*ln(57/144) = -t

Multiply both sides by -1:
-2*ln(57/144) = -(-t) = t

Answer 19

Ah okay would 1.8535 be the answer..?

Answer 20

Yeah, seems that right.

Answer 21

Thank you so much ! You are Brilliant !!!

Answer 22

Glad to help :D