They look fine, though your LaTeXing needs work...
I've been asked the following question:
The temperature of an electrical device at a time 't' is given by the function:
Where is the temperature at time t = 0 and is a constant
Find a) when is 60 degrees Celsius, t = 50 seconds and = 90 seconds
b) The time t, for to be the value of
I believe the answer for (a) to be:
However for question (b) I've gotten:
Can someone please let me know if I've gotten these correct?