Question

Can anyone explain how 98 was gotten. Thank you.

http://prntscr.com/bys3hk

Answer 1

you are given an equation and data

the data tells you that with a starting temperature of 207 F and a surrounding temp of 69 F and t= 20 then T = 138F

so if you look at that data nad the equation the only thing you don't know is k

SO

use THAT data to find k

AFter that you then are askes to use t= 45

Since you now know all the other stuff then you can find the value of T after 45 mins

Answer 2

one approach
direct substitution in the formula, solve for k now use the second situation when the time is 45 minutes