Posted by **Walt** on Monday, February 13, 2012 at 7:38pm.

Can you Check my work please?

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.

b. Write down two equations for P and a, one when t = 4 and the other when t = 8.

c. Use these two equations to compute a and P. Round your values to three signiﬁcant

digits, but be sure to store the more precise values for further calculations

My equations:

Pa^4 = 5600

Pa^8 = 362000

My rounded values:

P=86.1

a=2.84

Thank You For Checking

- Math -
**Reiny**, Monday, February 13, 2012 at 8:02pm
Since you are probably using a calculator, do not round off a number if it is to be used again .

Only round off final answers.

I agree with your value of a = 2.84

but a was really 2.835503062..

make use of your memory of your calculator and use that number.

that way I got 86.6298..

which would round off to 86.6

which is a significant difference from you 86.1

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