Answer:
The temperature after 10 hours is -9 ºF.
Step-by-step explanation:
This statement can be translated mathematically as follows. The temperature after 10 hours from sunrise is:
[tex]T = -10\,^{\circ}F + \left(1\,\frac{^{\circ}F}{h} \right)\cdot (7\,h)+ \left(-2\,\frac{^{\circ}F}{h} \right)\cdot (3\,h)[/tex]
[tex]T = -9\,^{\circ}F[/tex]
The temperature after 10 hours is -9 ºF.
