Question

DIFFERENT QUESTION: Water is at temp. 23 deg C and air temp in car is -7 degrees C. This can be modelled by T(t)=-7+Ae^(kt), degrees C, t hrs after the car door closes. After 3 hours the temp of water is 11 degrees C. What is K?

Answer 1

is that e^(kt)?

Answer 2

yea

Answer 3

put the brackets there because thats how wolframalpha likes it

Answer 4

we found A = 30 , right ?

Answer 5

yeah

Answer 6

my calc book is ruined..

Answer 7

when t = 3, T(3) = 11

Answer 8

I was thinking sub 11 of T, t fpr 3/

Answer 9

lets plug this in to solve for k

Answer 10

yes

Answer 11

lerlz you spoke too fast

Answer 12

to get rid of e it is ln right

Answer 13

yes