We have the function:
[tex]f\mleft(x\mright)=-0.4x-10[/tex]
And we need to find its value when x = -12. So, replacing x with -12, we obtain:
[tex]f(-12)=-0.4(-12)-10=4.8-10=-5.2[/tex]
Notice that the product of two negative numbers is a positive number.
Therefore, the answer is -5.2.
