Applications of exponential functions help!!

[Kirstenk]

Can anyone help with this question? I have the answer for A)

I₇=142 (nwn)

but i really do not understand how to get b? I'd be very grateful if anyone could be of assistance.

 

[Dr.Peterson]

Set I_t to 770, and solve for t.

 

[Kirstenk]

Hi thanks for your reply.

can you help me with how to rearrange this?

 

[Steven G]

You need to solve 770 = 7e^(0.43t) for t.
From that equation can you figure out what e^(0.43t) equals?
Post back and we will proceed from there.