Can you check my work Please?

Question

Let N(t) be the number of bacteria after t days. Then N(t) = Pa^t for some constants P and a. Measurements indicate that N(4) = 5600 and N(8) = 362, 000

1. Write down the formula for N(t) using the rounded values of a and P. (But remember to use the more precise stored values when you use the formula!)
2. Evaluate N(7), N(9), and N(11). (Give answers to the nearest bacterium.)

1. My formula: 86.6(2.84)^t (these are rounded values)

2. (Using non Rounded Values I got the following)
N(7) = 17667 N(9) = 1026452 N(11) = 8252755

Answer 1

I assume this is a continuation of the question from yesterday.
http://www.jiskha.com/display.cgi?id=1329179895

for N(7) I got 127667 using memory-stored "exact" values of a and P
Your values for N(9) and N(11) are correct

looks like you just had a typo.

Answer 2

Yes, it was from yesterday, sorry if I should've just put this in that post. But thanks a bunch for checking my work.