I don't know what this is supposed to mean, but thanks for the free points! ;)
It dropped by 4.5 means that we have to subtract 4.5 from 9.2
9.2 - 4.5 = 4.7 °C
So 4.7 °C is your answer :D
X^2+8x+15 is the area
because x+5 = length
and x +3 = width
(x+5)(x+3) =
x^2+3x+5x+15 =
x^2+8x+15 (area)
Hello!

Angles in a triangle sum up to 180°, so:
180° = 58° + 58° + m∠3
Combine and subtract:
180° = 116° + m∠3
64° = m∠3
Thus, the answer is D.