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2-64.

Kimberly is always complaining that it is either too hot or too cold. As a matter of fact, she is so picky that she is only happy when it is exactly $72°$F. At 8:00 a.m. it is $65°$F. By 3:00 p.m. it is $90°$.

1. Is there a time when Kimberly is happy?

Is it possible for temperature to rise from $65°$F to $90°$F without reaching every possible temperature in between $65°$F to $90°$F ?

2. If at 6:00 p.m. the temp is $70°$F, what is the minimum number of times Kimberly was happy today?

At 8:00 am, it was $65°$ F.
At 3:00 pm, it was $90°$F.
At 6:00 pm, it was $70°$F.